Relevant bibliographies by topics / Aquatic environment Chemistry

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Aquatic environment Chemistry'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Aquatic environment Chemistry.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Aquatic environment Chemistry"

1

Johnston, R. "Aquatic Chemistry and the Human Environment." Chemistry and Ecology 2, no. 2 (January 1986): 125–69. http://dx.doi.org/10.1080/02757548608070829.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Baldwin, Darren S. "Organic phosphorus in the aquatic environment." Environmental Chemistry 10, no. 6 (2013): 439. http://dx.doi.org/10.1071/en13151.

Full text
Abstract:
Environmental context Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. This paper discusses the distribution, cycling and ecological significance of five major classes of organic P in the aquatic environment and discusses several principles to guide organic P research into the future. Abstract Organic phosphorus can be one of the major fractions of phosphorus in many aquatic ecosystems. Unfortunately, in many studies the ‘organic’ P fraction is operationally defined. However, there are an increasing number of studies where the organic P species have been structurally characterised – in part because of the adoption of 31P NMR spectroscopic techniques. There are five classes of organic P species that have been specifically identified in the aquatic environment – nucleic acids, other nucleotides, inositol phosphates, phospholipids and phosphonates. This paper explores the identification, quantification, biogeochemical cycling and ecological significance of these organic P compounds. Based on this analysis, the paper then identifies a number of principles which could guide the research of organic P into the future. There is an ongoing need to develop methods for quickly and accurately identifying and quantifying organic P species in the environment. The types of ecosystems in which organic P dynamics are studied needs to be expanded; flowing waters, floodplains and small wetlands are currently all under-represented in the literature. While enzymatic hydrolysis is an important transformation pathway for the breakdown of organic P, more effort needs to be directed towards studying other potential transformation pathways. Similarly effort should be directed to estimating the rates of transformations, not simply reporting on the concentrations. And finally, further work is needed in elucidating other roles of organic P in the environment other than simply a source of P to aquatic organisms.
APA, Harvard, Vancouver, ISO, and other styles
3

Slaveykova, Vera I., Mengting Li, Isabelle A. Worms, and Wei Liu. "When Environmental Chemistry Meets Ecotoxicology: Bioavailability of Inorganic Nanoparticles to Phytoplankton." CHIMIA International Journal for Chemistry 74, no. 3 (March 25, 2020): 115–21. http://dx.doi.org/10.2533/chimia.2020.115.

Full text
Abstract:
The present review critically examines the state-of-the-art of the research concerning the likely environmental implications of engineered nanoparticles (ENPs) with specific emphasis on their interactions with phytoplankton in the aquatic environment. Phytoplankton plays a key role in the global carbon cycle and contributes to the half of the global primary production, thus representing some of the Earth ' s most critical organisms making the life on our planet possible. With examples from our own research and the literature, we illustrate what happens when aquatic organisms are unintentionally exposed to metal-containing ENPs, which are increasingly released into the environment from nano-enabled materials. We highlight the complexity of the ENPs behavior in the aquatic environment and focus on the three key steps of the bioavailability process: exposure availability, uptake availability and toxico-availability. The influence of the phytoplankton on the ENPs fate in the aquatic environment is discussed, too.
APA, Harvard, Vancouver, ISO, and other styles
4

Khetan, Sushil K., and Terrence J. Collins. "Human Pharmaceuticals in the Aquatic Environment: A Challenge to Green Chemistry." Chemical Reviews 107, no. 6 (June 2007): 2319–64. http://dx.doi.org/10.1021/cr020441w.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Adler, Peter, and Gregory Courtney. "Ecological and Societal Services of Aquatic Diptera." Insects 10, no. 3 (March 14, 2019): 70. http://dx.doi.org/10.3390/insects10030070.

Full text
Abstract:
More than any other group of macro-organisms, true flies (Diptera) dominate the freshwater environment. Nearly one-third of all flies—roughly 46,000 species—have some developmental connection with an aquatic environment. Their abundance, ubiquity, and diversity of adaptations to the aquatic environment position them as major drivers of ecosystem processes and as sources of products and bioinspiration for the benefit of human society. Larval flies are well represented as ecosystem engineers and keystone species that alter the abiotic and biotic environments through activities such as burrowing, grazing, suspension feeding, and predation. The enormous populations sometimes achieved by aquatic flies can provide the sole or major dietary component for other organisms. Harnessing the services of aquatic Diptera for human benefit depends on the ingenuity of the scientific community. Aquatic flies have played a role as indicators of water quality from the earliest years of bioassessment. They serve as indicators of historical and future ecological and climate change. As predators and herbivores, they can serve as biological control agents. The association of flies with animal carcasses in aquatic environments provides an additional set of tools for forensic science. The extremophilic attributes of numerous species of Diptera offer solutions for human adaptation to harsh terrestrial and extraterrestrial environments. The potential pharmaceutical and industrial applications of the symbiotic microbial community in extremophilic Diptera are better explored than are those of dipteran chemistry. Many flies provide valuable ecological and human services as aquatic immatures, but are also pests and vectors of disease agents as terrestrial adults. The scientific community, thus, is challenged with balancing the benefits and costs of aquatic Diptera, while maintaining sustainable populations as more species face extinction.
APA, Harvard, Vancouver, ISO, and other styles
6

Clark, Elizabeth A., Robert M. Sterritt, and John N. Lester. "The fate of tributyltin in the aquatic environment." Environmental Science & Technology 22, no. 6 (June 1988): 600–604. http://dx.doi.org/10.1021/es00171a001.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Stahlschmidt-Allner, Petra, Bernhard Allner, Jörg Römbke, and Thomas Knacker. "Endocrine disrupters in the aquatic environment." Environmental Science and Pollution Research 4, no. 3 (September 1997): 155–62. http://dx.doi.org/10.1007/bf02986325.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Hamilton, E. I. "Organic micropollutants in the aquatic environment." Science of The Total Environment 65 (September 1987): 275. http://dx.doi.org/10.1016/0048-9697(87)90186-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Benarie, Michel. "Organic micropollutants in the aquatic environment." Science of The Total Environment 79, no. 1 (February 1989): 96–97. http://dx.doi.org/10.1016/0048-9697(89)90058-2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ojoghoro, J. O., M. D. Scrimshaw, and J. P. Sumpter. "Steroid hormones in the aquatic environment." Science of The Total Environment 792 (October 2021): 148306. http://dx.doi.org/10.1016/j.scitotenv.2021.148306.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Aquatic environment Chemistry"

1

Celo, Valbona. "Abiotic pathways of mercury methylation in the aquatic environment." Thesis, University of Ottawa (Canada), 2004. http://hdl.handle.net/10393/29084.

Full text
Abstract:
This thesis studies the chemical reactions of mercury in different oxidations states with several natural methyl-donors present in the aquatic environment. The importance of the abiotic pathway of mercury methylation was assessed by a thorough examination of the kinetics of these reactions in various experimental conditions, relevant to environmental situations. The amount of methylmercury formed in the course of the chemical reactions studied herein shows that the abiotic mercury methylation can be a very significant source of this compound in the environment. The thesis comprises three main chapters which describe the reactions of three major methyl-donors: methyl iodide, methycobalamine and methyl tin compounds with mercury. Reaction of mercuric ions with methyl iodide yields HgI+ and HgI2 as inorganic products and MeOH as the only organic product. The reaction kinetics are biphasic and the reaction rate decreases with pH, increases with temperature and the reaction stops in the presence of complexing agents such as iodide ions. Meanwhile, the reaction of Hg0(aq) with methyl iodide yields 1.1% methylmercury which is a relatively high yield for environmental reactions. We show that the role of methyl iodide in the geochemical cycle of mercury in the aquatic environment is two-fold: it promotes the formation of compounds such as HgI + and HgI2 which are less reactive towards chemical and biological methylation and it methylates Hg0 which is present when Hg2+ is reduced by reducing agents found in the aquatic environment. The reaction of mercuric ions with methylcobalamine is studied using methylaquacobaloxime as a model compound. The mechanism is an electrophilic attack of Hg2+ to the Co-C bond. It results in the cleavage of this bond and formation of Hg-C bond in the structure of methyl mercury. The reaction is first order to mercury and methylcobaloxime concentration and the value of the second-order rate constant is k = (6.8 +/- 0.2) M-1 s-1 at 21.1°C, at a pH of 1.5 and an ionic strength of 0.030 M (HNO3). The reaction rate decreases with pH, and increases with temperature and ionic strength. The yield of methyl mercury formation is as high as 75%. The presence of chloride completely shuts down the reaction. So, abiotic methylation of mercury by methylcobalamin could be a source of methylmercury formation in fresh waters which have low pH and low chloride concentrations. (Abstract shortened by UMI.)
APA, Harvard, Vancouver, ISO, and other styles
2

Campbell, J. "The fate of fluorescent whitening agents in the aquatic environment." Thesis, University of South Wales, 1990. https://pure.southwales.ac.uk/en/studentthesis/the-fate-of-fluorescent-whitening-agents-in-the-aquatic-environment(4566785a-529e-4e59-873c-757b7aa19a23).html.

Full text
Abstract:
The commercial use of fluorescent whitening agents (FWA' s) in products such as soaps and detergents has resulted in the presence of these compounds in domestic waste waters. A model compound (A) (a possible initial degradation product of a stilbene-s-triazine type FWA) was synthesised and biodegradation studies carried out on this compound in filtered activated sludge solution. During the test period (approximately 6 months) no degradation products were observed. Prior to undertaking biodegradation studies on a purified commercial stilbene-s-triazine FWA, Blankophor REU-P, a method was sought to determine its concentration in aqueous solution. Using ultraviolet absorbance measurements the concentration of the Blankophor could be determined in distilled water. However, this method was unsuitable when the Blankophor was dissolved in filtered activated sludge solution. Attempts to extract the Blankophor from filtered activated sludge solution using solvent extraction and ion-exchange resins were unsuccessful. Using computer modelling (SIMCA), combined with ultraviolet absorbance measurements, it was possible to determine the concentration of the Blankophor in filtered activated sludge solution. Biodegradation studies were undertaken with the Blankophor using this method to monitor the Blankophor concentration. During the test period (six days) the Blankophor concentration fell from 1Oppm to approximately 5. 5ppm. It was possible to deduce that the Blankophor was not being absorbed onto the solid material of the activated sludge and that it had been metabolised and/or isomerised. Two ion-pairing agents, tetraphenyl arsoniurn chloride and oly[oxyethylene(dimethylimino)-ethylene(diethylimino)-ethylene] were examined to try to separate the Blankophor and the metabolites and/or isomers from the filtered activated sludge solution but no successful separation was achieved. Thin layer chromatography was examined briefly but again with no success. Photolysis experiments were undertaken with the Blankophor in distilled water. The concentration of the Blankophor fell from 1Oppm to approximately 7. 5ppm and its ultraviolet spectrum changed shape. This, coupled with the fact that the control spectra remained unaltered, indicated that the Blankophor had undergone photolytic conversion to metabolites and/or isomers. Although it is clear that FWA' s are fairly stable compounds which are slow to bio- and photo-degrade and that their toxicity to man, both directly and by bio-accumulationis is minimal little is still known about the toxicity of possible degradation products.
APA, Harvard, Vancouver, ISO, and other styles
3

Wilkinson, John L. "Occurrence, bioaccumulation, fate and transport of pharmaceuticals, plasticisers, illicit drugs and perfluorinated compounds in the aquatic environment." Thesis, Kingston University, 2017. http://eprints.kingston.ac.uk/39283/.

Full text
Abstract:
Mass produced chemicals have revolutionised the way in which humans live and has led to both a significant increase in quality of life and a concomitant change in the way we pollute our habitats. Such chemicals include pharmaceuticals, plasticisers, perfluorinated compounds and metabolites which enter rivers via sources such as sewage treatment works (STW) effluent outfalls. The presence and distribution of these contaminants is of concern due to their increasing use and ability of some to biologically affect non-target aquatic organisms at trace (ng/L) levels. This work investigated the fate and distribution of selected pharmaceuticals, plasticisers, illict drugs, perfluorinated compunds (PFCs) and metabolites are investigated in three rivers of southern England. Specific objectives included establishing spatial distribution patterns of selected contaminants along the entire course of rivers receiving inputs from multiple STWs, their partition between bound (to suspended particulate material) and dissolved phases of river water, accumulation in sediment, bioaccumulation in primary producers including plants and biofilm/ periphyton, bioaccumulation in benthic aquatic organisms, adsorption of studied contaminants to polyethlene microparticles (similar to those used in cosmetic products) both in the lab and in rivers, and adsorption to 'natural' replacements for polyethylene microparticles (MPs). Spatial distribution analysis showed that selected contaminants are ubiquitous in the studied rivers with trace levels of plasticisers and perfluorinated compounds identified in river headwaters and beyond. Within the rivers studied in this work, pharmaceuticals were shown to be exclusively introduced by STW effluent and persisted exclusively in the dissolved phase of river water through the studies areas. Plasticisers and PFCs however were additionally introduced via runoff from streets, at times at higher concentrations than in SFWs effluent outfall and bound to suspended particulate material. Only PFCs and plasticisers were found to be bioaccumulative or very bioaccumulative in aquatic plants, biofilm. periphton and benthic organisms, and accumulated in sediment. Illicit drugs were only found in STW effluent and downstream river flow, almost exclusively in the dissolved phase of collected water. Laboratory assessment of adsorption to polyethylene MPs showed adsorption largely occurred via a linear isotherm and only for PFCs. However, trace levels of pharmaceuticals and an illicit drug urinary metabolite were extracted from polyethylene MPs deployed downstream from STW effluent outfalls in three rivers. Investigation of a 'natural' alternative to polyethyle MPs (walnut husk Mps) showed adsorption to these replacement particles occurred to a greater amount with more of the studied contaminants than to polyethylene MPs. This work significantly contributes to the knowledge of organis contaminant occurrence, bioaccumulation, fate and distribution in the aquatic environment. Future research should focus on elucidating the fate and distribution of conugated pharmaceuticals and metabolites in the aquatic environment, establishing organism-specific contaminant bioaccumulation guideline, the effect of microparticle fragmentation on contaminant adsorption, identification of adsorption-free MPs for use in cosmetic products and developing study designs to incorporate environmental epigenetics with toxicology and chemistry in the aquatic environment.
APA, Harvard, Vancouver, ISO, and other styles
4

Stendera, Sonja. "Spatiotemporal variability of chemistry and biota in boreal surface waters : a multiscale analysis of patterns and processes /." Uppsala : Dept. of Environmental Assessment, Swedish University of Agricultural Sciences, 2005. http://epsilon.slu.se/200595.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Ababneh, Fuad A. "Application of chemical kinetics to mercury cycling in the aquatic environment: Photoreduction of mercury(II) and binding of mercury(II) and methylmercury(+) to natural ligands." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/29187.

Full text
Abstract:
The thesis comprises four main chapters on chemical reactions and kinetics of some of the processes involved in the global mercury cycle. In the first chapter, the UVA irradiation of aqueous acidic mercuric chloride in the presence of large excess of Fe(III) organic diacid complexes results in partial reduction of the mercuric ion to elemental mercury. The pseudo-first-order rate constant (k) for photoreduction reaction is pH-dependent. Similar results were obtained using visible irradiation although the rates were ca. 10 times slower. The mechanism of photoreduction is inferred to involve reaction of Hg(II) with a secondary photoproduct, the strongly reducing radical anion CO 2-•. No other previous reports have suggested the involvement of this radical in mercury reduction. In the presence of dissolved oxygen, competition for CO2-• between Hg(II) and O2 reduces the rate and efficiency of mercuric ion reduction. The O2-•/HO2 products do not reduce Hg(II). On the contrary, their disproportionation leads to the formation of H2O2 which causes a slow reoxidation of Hg(0). In the second chapter, the reaction rate of UVA photoreduction of Hg(II) ions by fulvic and humic acids was found to have higher values in the pH range of 5 to 6 which is relevant to most aquatic environments, within this pH range, speciation calculations show that most of Hg(II) will bind to DOC. The effects of environmentally relevant parameters such as Hg(II)/HS ratio, and chloride concentration were investigated and the likely mechanism identified. The interaction of DOC with Hg species is not only limited to photoreactions but also the complexation reaction affects the bioavailability and speciation of Hg. This was the topic of the last two chapters. The kinetic stability of Hg-HS and McHg-HS complexes was characterized by different combined techniques; the competitive ligand exchange method (CLEM) combined with inductively coupled plasma-mass spectrometer (CLEM-ICP-MS) and the tangential flow ultrafiltration (TFUF) combined to CLEM-ICP-MS. The Hg-HS complexes can be described by at least two kinetically distinguished components; the more inert (slow) with a dissociation rate constant in the order of 10-5 s -1, and a labile component with a dissociation rate constant in the order of 10-3 s-1, protons (H+) was found to compete with Hg2+ for the strong binding sites, Hg/HS concentration ratio also was an important parameter, when [Hg 2+] was high then the strong binding sites was saturated and the excess Hg bound to the weak sites. (Abstract shortened by UMI.)
APA, Harvard, Vancouver, ISO, and other styles
6

Hetheridge, Malcolm John. "An evaluation of the environmental fate of reactive dyes." Thesis, University of Plymouth, 2001. http://hdl.handle.net/10026.1/467.

Full text
Abstract:
Dyestuffs are widely used industrial chemicals, yet surprisingly little is known about their fate in the environment. The potential modes of transformation and removal of reactive dyes in treatment and in the environment are principally through anaerobic and aerobic biodegradation and photodegradation. The research herein describes the use of LC-MS analysis with laboratory simulations to develop a better understanding of the occurrence and fate of reactive dyes and their degradation products in the aquatic environment. One reason for the lack of information on the environmental fate of reactive dyes has been the paucity of robust analytical methods suitable for the determination of dyes in aqueous samples. Robust analytical methods were optimised to provide LC-MS and MSMS identification of degradation products. Additionally, interpretation of the MSMS spectra of known reactive dyes provided novel characteristic fragment ions indicative of the triazine reactive group of reactive dyes . Fibre reactive dyes are designed to have a degree of photostability and therefore their photodegradation behaviour has not been widely investigated. Little is known of their stability to daylight over prolonged periods of irradiation in dilute aqueous solutions and in the presence of humic substances. The kinetics of photodegradation of an anthraquinone dye (Reactive Blue H4R) and azo dye (Reactive Yellow P5G) were evaluated. The former underwent rapid and extensive degradation 01/2 1.5 h). The major products formed were identified using LC-MSMS and a photodegradation pathway proposed. By comparison, the photodegradation of the azo dye was significantly slower, 01/2 30 h). The addition of humic substancesa ppearedt o have little effect on the rate of photodegradationu nder the conditions used. The reduction of azo dyes under anaerobic treatment has been extensively studied, but the subsequent fate of the initial reduction products when exposed to air are not understood. Three relatively simple azo dyes, Amaranth, Sunset Yellow and Naphthol Blue-Black, were reduced and their autoxidation products identified by LC-MS. These were subsequently used to predict the autoxidation products of a more complex azo reactive dye: Reactive Red 3.1. Additionally, a persistent degradation product from the anaerobicaerobic treatment of Reactive Red 3.1 was identified from LC-MS data. Azo reactive dyes are generally regarded as being resistant to aerobic degradation and there are few published data regarding degradation pathways for reactive anthraquinone dyes. Pure cultures of Pseudomonas docunhae, A 9046 and A texaco and mixed bacterial consortia (semi-continuous activated sludge, SCAS) aerobic degradation of azo and anthraquinone reactive dyes was studied. Two azo dyes were degraded by pure cultures of A docunhae and A 9046, suggesting that azo dyes can be aerobically degraded given favourable conditions. The antraquinone dye was extensively degraded by SCAS and pure culture biodegradation. Metabolites were identified by LC-MS and a degradation pathway proposed.
APA, Harvard, Vancouver, ISO, and other styles
7

Suddick, Emma C. "Nitrogen photo-chemistry and the dynamics of CDOM in aquatic environments." Thesis, University of Aberdeen, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485377.

Full text
Abstract:
Photochemical ammonium production and photo-bleaching of chromophoric dissolved organic matter (CDOM) kinetics were studied in a variety of aquatic environments including freshwater samples of peatland origin, Caithness, a Tyne Estuary (NE, U.K.) estuary and the Iberian Sea. The main aims of the study were to assess seasonal variability within the peatland catchments, in conjunction with a study of regional and geographical variability of dissolved organic matter (DOM) and ammonium photo-production. Samples collected from a variety of aqueous environments covered the CDaM .absofPtion coefficient at 350 nm (a350) range 0.3 to 69.0 m-I. Selected, filtered samples (n=21) were exposed to natural and artificial light, in order to study ~+ photo-production CDaM photo-bleaching. The photo-chemical degradation of CDaM, as indicated by decreases in a350 over time, also led to increases in the spectral slope of sample absorbance over the wavelength range 290-350 nm, and losses of total fluorescence intensity. In addition we observed hypsochromic shifts of long-wave, humic-like fluorescence (fluorophore A). Photo-chemical ammonium release was observed in 19 of the total 21 irradiation experiments. However the kinetics of ammonium production were complex with 4 of the 21 samples showing a near-linear increase in NH/ concentration while other samples showed an initial lag phase, followed by production and then a decline in NH/ concentrations. In order to assess possible impacts of ~+ release on N balance we estimated NH4+ photoproduction potentials from concentration differences between the initial values and maximum ~+ values divided by irradiation time (i1t). Thus obtained ~+ photo-production potentials between sites ranged from 0 to 3.57 JIM r1 h-I (mean ± stdev 0.7) under solar noon irradiance levels. Using calculated daily sky irradiance and seasonal correction factors, annual depth integrated ~+ photo-production rates were estimated, ranging from 0.06 to 8.05 JIMNm-2 yrI( mean ± stdev 2.73). The photo-chemical production ofNH/ indicates that photo-chemically induced nitrogen release could potentially be an important source of biologically labile nitrogen to aquatic ecosystems, with severe impacts upon the biogeochemistry and nutrient limitation of these environments when compared to N-reservoir size and other N fluxes. However, compared to N deposition photo-ammonification is not a major source ofN. Key words: Dissolved organic matter, chromophoric dissolved organic matter, photoammonification, peatlands, estuaries, marine, and fluorescence.
APA, Harvard, Vancouver, ISO, and other styles
8

Asadishad, Bahareh. "Transport and survival of bacteria in model aquatic environments: role of water chemistry, surface geochemistry, and temperature." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121366.

Full text
Abstract:
The occurrence of microbial pathogens in drinking water sources is recognized as a significant threat to public health. A better understanding of the key processes governing the fate of microbial pathogens in groundwater aquifers can help mitigate the risk of drinking water contamination. The attachment of pathogens to aquifer surfaces and the inactivation of attached and suspended pathogens are key processes that attenuate the concentration of viable pathogens in potable water supplies. Although substantial research effort has been aimed at elucidating the role of various physical, chemical and biological factors on the inactivation rate of microbes suspended in the aqueous phase, our understanding of microbe inactivation when attached to grain surfaces is limited. Thus, the first objective of this work was to develop a fluorescence-based experimental technique for evaluating the inactivation kinetics of bacteria adhered onto a surface in an aqueous environment. The technique was sensitive enough to distinguish between the inactivation kinetics of different representative bacteria attached to either a negatively or a positively charged surface. The new method was then used to characterize bacterial inactivation kinetics when attached to environmentally relevant surface chemistries such as metal oxides over a broad range of groundwater chemistries. X-ray photoelectron spectroscopy (XPS) characterization of bacterial-surface bonding was used to interpret inactivation behavior. It was observed that attachment of cells to metal-oxide surfaces can lead to formation of covalent bonds, specifically O- and C-metal bonds, between the cell and the surface, resulting in reduced bacterial viability (i.e., cell membrane integrity). Surface and near-surface soils in cold climate regions experience low temperature and freeze-thaw (FT) conditions in the winter. Microorganisms that are of concern to groundwater quality may have the potential to survive low temperature and FT in the soil and aqueous environments. Although there is a large body of literature on the survival of pathogenic bacteria at different environmental conditions, little is known about their transport in groundwater environments in low temperatures and after FT. Thus, in the second part of the project, the effect of cold temperature and repeated FT on survival, survival strategies such as motility and biofilm formation, and virulence of selected Gram-negative and Gram-positive bacteria was investigated. The adhesion properties and transport of bacteria exposed to FT were studied using quartz crystal microbalance with dissipation monitoring (QCM-D) and water saturated sand-packed columns. The expression levels of different genes encoding synthesis of flagellin, extracellular matrix production, and virulence factors were measured using quantitative reverse transcription polymerase chain reaction (qRT-PCR). Our findings demonstrate that bacteria exhibited greater retention onto sand grains after exposure to FT. Moreover, bacteria tend to survive for longer periods of time and may become more virulent at low temperature in higher ionic strength waters thereby posing a potential threat to drinking water supplies.
L'apparition d'agents pathogènes microbiens dans les sources d'eau potable est reconnu comme une menace importante pour la santé publique. Une meilleure compréhension des processus fondamentaux qui régissent le sort des pathogènes microbiens dans les aquifères d'eau souterraine peut contribuer à atténuer le risque de contamination de l'eau potable. L'attachement des agents pathogènes aux surfaces des nappes phréatiques et leur inactivation lorsqu'ils sont attachés et suspendus, sont les processus clés qui atténuent la concentration des pathogènes viables dans l'approvisionnement en eau potable. Bien qu'un effort substantiel de recherche ait été réalisé, visant à élucider le rôle de divers facteurs physiques, chimiques et biologiques sur le taux d'inactivation des microbes en suspension dans la phase aqueuse, notre compréhension de l'inactivation du microbe lorsqu'il est attaché à la surface des grains est limitée. Ainsi, le premier objectif de ce travail était de développer une technique expérimentale basée sur la fluorescence pour évaluer la cinétique d'inactivation de bactéries collées sur une surface dans un environnement aqueux. La technique est suffisamment sensible pour faire la distinction entre la cinétique d'inactivation de différentes bactéries représentatives, montées soit sur une surface chargée négativement ou positivement. La nouvelle méthode a ensuite été utilisée pour caractériser la cinétique d'inactivation bactérienne lorsqu'elle est reliée à la chimie de surface environnementale telle que les oxydes métalliques et ceci sur une large gamme de produits chimiques des eaux souterraines. La caractérisation de la liaison bactérienne de surface par spectroscopie photoélectronique X (XPS) a été utilisée pour interpréter le comportement de l'inactivation. Il a été observé que l'attachement des cellules aux surfaces métal-oxyde peut conduire à la formation de liaisons covalentes, plus précisément des liaisons O- et C-métal, entre la cellule et la surface, ce qui entraîne une réduction de la viabilité bactérienne (i.e. une perte de l'intégrité de la membrane cellulaire).Dans les régions à climat froid, les sols de surface ou proches de la surface subissent de basses températures et des périodes de gel-dégel (GD). Les micro-organismes qui sont des sources de préoccupation pour la qualité des eaux souterraines peuvent avoir le potentiel de survivre à basses températures et aux périodes de GD, dans le sol et les milieux aqueux. Bien qu'il existe une littérature abondante sur la survie des bactéries pathogènes à différentes conditions environnementales, on possède peu d'informations au sujet de leur transport dans les environnements d'eau souterraine à des températures basses et après GD. Ainsi, dans la deuxième partie du projet, l'effet de la température froide et l'effet des périodes GD répétés ont été étudiés sur les stratégies de survie telles que la mobilité et la formation de biofilms ainsi que la virulence des bactéries sélectionnées à Gram négatif et Gram positif . Les propriétés d'adhérence et le transport des bactéries exposées à des périodes de GD ont été étudiés à l'aide d'une microbalance à cristal de quartz avec mesure de la dissipation (QCM-D) et de l'eau contenue dans des colonnes saturées de sable. Les niveaux d'expression des différents gènes codant pour la synthèse de la flagelline, la production de la matrice extracellulaire et des facteurs de virulence ont été mesurés en utilisant la transcription par réaction en chaîne par polymérase inverse quantitative (qRT-PCR). Nos résultats démontrent que les bactéries présentent une plus grande rétention sur les grains de sable après l'exposition aux périodes de GD. En outre, les bactéries ont tendance à survivre pendant de longues périodes de temps et peuvent devenir plus virulent à basse température dans des eaux à plus grande force ionique posant ainsi une menace potentielle pour l'eau potable.
APA, Harvard, Vancouver, ISO, and other styles
9

Dickson, Dionne. "The Effect of Iron Oxide Nanoparticles on the Fate and Transformation of Arsenic in Aquatic Environments." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/858.

Full text
Abstract:
Iron oxides and arsenic are prevalent in the environment. With the increase interest in the use of iron oxide nanoparticles (IONPs) for contaminant remediation and the high toxicity of arsenic, it is crucial that we evaluate the interactions between IONPs and arsenic. The goal was to understand the environmental behavior of IONPs in regards to their particle size, aggregation and stability, and to determine how this behavior influences IONPs-arsenic interactions. A variety of dispersion techniques were investigated to disperse bare commercial IONPs. Vortex was able to disperse commercial hematite nanoparticles into unstable dispersions with particles in the micrometer size range while probe ultrasonication dispersed the particles into stable dispersions of nanometer size ranges for a prolonged period of time. Using probe ultrasonication and vortex to prepare IONPs suspensions of different particle sizes, the adsorption of arsenite and arsenate to bare hematite nanoparticles and hematite aggregates were investigated. To understand the difference in the adsorptive behavior, adsorption kinetics and isotherm parameters were determined. Both arsenite and arsenate were capable of adsorbing to hematite nanoparticles and hematite aggregates but the rate and capacity of adsorption is dependent upon the hematite particle size, the stability of the dispersion and the type of sorbed arsenic species. Once arsenic was adsorbed onto the hematite surface, both iron and arsenic can undergo redox transformation both microbially and photochemically and these processes can be intertwined. Arsenic speciation studies in the presence of hematite particles were performed and the effect of light on the redox process was preliminary quantified. The redox behavior of arsenite and arsenate were different depending on the hematite particle size, the stability of the suspension and the presence of environmental factors such as microbes and light. The results from this study are important and have significant environmental implications as arsenic mobility and bioavailability can be affected by its adsorption to hematite particles and by its surface mediated redox transformation. Moreover, this study furthers our understanding on how the particle size influences the interactions between IONPs and arsenic thereby clarifying the role of IONPs in the biogeochemical cycling of arsenic.
APA, Harvard, Vancouver, ISO, and other styles
10

Senft-Grupp, Schuyler. "The development of steady State and lifetime fluorescence instruments for real time in situ aquatic chemistry measurements." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/97796.

Full text
Abstract:
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.
Cataloged from PDF version of thesis.
Includes bibliographical references.
The development of three optical instruments for the chemical exploration and characterization of natural waters is described. The first instrument (called LEDIF) employs a novel flowcell, 6 UV LEDs as excitation sources, a wideband lamp, and a spectrometer to measure steady state chemical fluorescence and absorbance. The instrument is packaged aboard an autonomous underwater vehicle (AUV) and demonstrates the ability to map chemical concentrations in three dimensions. The second instrument repackages the sensor components to study dissolved organic matter (DOM) in tropical Southeast Asia peatland rainforests. This instrument is optimized for low power consumption over long deployments to remote locations. Two field trials in Pontianak Indonesia with durations of two and six weeks captured peatland river fluorescence measurements at 20 minute intervals. The results show changes in DOM linked to tidally induced water level fluctuations and provide insight into the complex biogeochemical dynamics of the system. The third instrument increases the chemical sensitivity and specificity of LEDIF with the addition of fluorescence lifetime sensing capabilities. The development of this sensor for AUV deployment required the engineering of a compact, low power, high speed (GHz) data acquisition circuit board. The resulting circuit digitizes data at a rate of 1 gigasample/second and performs user customizable digital signal processing. This board is used along with a 266 nm Q-switch laser, fast photomultiplier tube (PMT), and computer controlled monochromator to build a small fluorescence lifetime instrument. The instrument is tested with solutions of low concentration pyrene to demonstrate its ability to identify small, long-lived fluorescence signals in the presence of large background fluorescence. Results indicate a pyrene limit of detection below environmentally relevant levels. The final overall instrument dimensions allows it to be packaged for future AUV deployments
by Schuyler Senft-Grupp.
Ph. D.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Aquatic environment Chemistry"

1

International Symposium on Colloids in the Aquatic Environment (1992 University College, London). Colloids in the aquatic environment. London: Published for SCI by Elsevier Applied Science, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

1952-, Li An, ed. Physical and chemical processes in the aquatic environment. Hoboken, New Jersey: Wiley, 2014.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

G, Smith D. Heavy metals in the New Zealand aquatic environment: A review. Edited by Williamson R. B. 1947-. Wellington: National Water and Soil Conservation Authority, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Vosniakos, Fokion K. Radioactivity Transfer in Environment and Food. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Howard, A. G. Aquatic environmental chemistry. Oxford: Oxford University Press, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

A problem-solving approach to aquatic chemistry. New York: Wiley, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Weiner, Eugene R. Applications of environmental aquatic chemistry: A practical guide. 2nd ed. Boca Raton, FL: CRC Press, 2008.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Leifer, Asa. The kinetics of environmental aquatic photochemistry: Theory and practice. Washington, DC: American Chemical Society, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Hrubec, Jiri. Water pollution: Drinking water and drinking water treatment. Berlin: Springer, 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Handy, Richard D., and Nicolas R. Bury. Surface chemistry, bioavailability and metal homeostasis in aquatic organisms: An integrated approach. London: Society for Experimental Biology, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Aquatic environment Chemistry"

1

Manninen, Pentti K. G., and Marjo Lauren. "Naturally produced organic chlorine in the Finnish aquatic environment." In Environment & Chemistry, 131–37. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0061-8_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Van ’T Klooster, H. A. "Chemometrics in Environmental Analytical Chemistry." In Organic Micropollutants in the Aquatic Environment, 416–29. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2989-0_52.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Hejzlar, Josef, Hans Borén, and Anders Grimvall. "Structures of aquatic humic substances responsible for the reaction with chlorine." In Environment & Chemistry, 201–12. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0061-8_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Molins-Delgado, Daniel, M. Silvia Díaz-Cruz, and Damià Barceló. "Introduction: Personal Care Products in the Aquatic Environment." In The Handbook of Environmental Chemistry, 1–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/698_2014_302.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Sulzberger, Barbara, and Stephan I. Hug. "Light-Induced Processes in the Aquatic Environment." In Chemistry of Aquatic Systems: Local and Global Perspectives, 183–212. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-017-1024-4_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sun, Qian, Min Lv, Mingyue Li, and Chang-Ping Yu. "Personal Care Products in the Aquatic Environment in China." In The Handbook of Environmental Chemistry, 73–94. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/698_2014_284.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Summers, R. Scott, Friedrich Fuchs, and Heinrich Sontheimer. "The Fate and Removal of Radioactive Iodine in the Aquatic Environment." In Advances in Chemistry, 623–36. Washington, DC: American Chemical Society, 1988. http://dx.doi.org/10.1021/ba-1988-0219.ch035.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Liu, Guangliang, Yanbin Li, and Yong Cai. "Adsorption of Mercury on Solids in the Aquatic Environment." In Environmental Chemistry and Toxicology of Mercury, 367–87. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118146644.ch11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Pavlidou, A., I. Hatzianestis, Ch Zeri, and E. Rouselaki. "Chemistry of Submarine Groundwater Discharge in Kalogria Bay, Messinia-Greece." In Advances in the Research of Aquatic Environment, 229–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24076-8_27.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pennanen, V. "Optical Monitoring of Natural Organic Matter in the Aquatic Environment." In Chemistry for the Protection of the Environment, 141–42. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3282-8_10.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Aquatic environment Chemistry"

1

Zhou, Xiu-yan, Xiang-xin Xue, Wen-fang Leng, and Du-ning Xiao. "Aquatic Environmental Chemistry of Intertidal Zone in Bohai Bay of Qinhuangdao." In 2010 International Conference on Digital Manufacturing and Automation (ICDMA 2010). IEEE, 2010. http://dx.doi.org/10.1109/icdma.2010.343.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Aquatic environment Chemistry"

1

Elliott, Scott. Jaynesian Analysis of Environmental Chemistry: Systems Model Component Integration via the Arctic Aquatic Carbon Cycle. Office of Scientific and Technical Information (OSTI), April 2021. http://dx.doi.org/10.2172/1769731.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Aquatic environment Chemistry' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography