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Tesis sobre el tema "Chromium Environmental aspects"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de enero de 2023

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1

Abdol, Rahim Kartini. "Chromium dynamics in soil." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37605/.

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Due to increasing awareness of potential Cr toxicity, there is a pressing need to establish sensitive and robust Cr fractionation and speciation methodologies that will be enable separation of the two redox Cr species (CrIII and CrVI) from different environmental phases and their quantification. The intention of this work was to assess the behaviour of Cr species, especially CrVI, in soils and the factors controlling Cr solubility, fractionation, redox transformation rates and uptake by plants. The analysis methods relied on alkaline extraction in TMAH, liquid chromatography (LC) to separate t

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2

Anestis, Ioannis D. "Preference avoidance reactions of rainbow trout (Salmo gairdneri) following long term sublethal exposure to chromium and copper." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75767.

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A standard methodology was developed for performing avoidance-preference tests, using Rainbow Trout (Salmo gairdneri) as the test organism. Experiments were conducted in a hydraulic channel, 9.15 m long by 0.30 m wide, partly divided along its length, and at a flow depth of 0.30 m. The design combined steep and shallow gradient characteristics. The toxicants investigated included Cu(II), Cr(III) and Cr(VI). The lowest avoidance threshold values were established at 2.1 $ mu$g/l for Cu(II) and 0.0026 mg/l and 0.026 mg/l for Cr(III) and Cr(VI) respectively while avoidance reactions increased with

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3

Kamaludeen, Sara Parwin Banu. "Biotic-abiotic transformations of chromium in long-term tannery waste contaminated soils : implications to remediation." Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09PH/09phk15.pdf.

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Bibliography: leaves 166-180. Determines the effect of chromium on the soil microbial community and its activity, the biotic-abiotic mechanisms involved in chromium oxidation, and phytostabilization of chromium using plants and organic amendment in tannery-waste contaminated soil.

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4

Cheung, Ka-hong, and 張嘉康. "Chromate toxicity assessment and detoxification by bacteria from the marine environment." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B45015351.

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5

Gendusa, Tony C. "Toxicity of Chromium and Fluoranthene From Aqueous and Sediment Sources to Selected Freshwater Fish." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc330672/.

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Research efforts in aquatic toxicology have historically centered on the chemical analyses and toxic effects of waters to aquatic organisms. More recently, sediment-source toxicity has been explored, with efforts concentrated on establishing sensitive and accurate methodologies. This study focused on the toxicity of trivalent chromium, hexavalent chromium, and fluoranthene to Pimephales promelas, Ictalurus punctatus, and Lepomis macrochirus. Test fish were exposed to both water-borne and sediment-source toxicants for 96 hours (h) and 30 days (d). A 96-h and 30-d LC50 (mg/L Cr, ug/L Fluoranthen

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6

Meza, Maria I. "The use of PRBs (permeable reactive barriers) for attenuation of cadmium and hexavalent chromium from industrial contaminated soil." Muncie, Ind. : Ball State University, 2009. http://cardinalscholar.bsu.edu/432.

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7

Sedumedi, Hilda N. "Chromium contamination in the vicinity of [the] Xstrata Wonderkop plant." Thesis, 2009. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000304.

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M. Tech. Chemistry.<br>The aim of this study was to develop and evaluate an analytical method for the determination of Cr(VI) in ferrochrome dusts and to apply the method in the analysis of environmental samples (grass, soil and tree bark) for Cr(VI) content (that might be caused by dust emissions originating from the smelter). Both the public and Xstrata Wonderkop ferrochrome plant will benefit from data of Cr(VI) determination generated from the study. The information can potentially be incorporated into health risk assessments of the affected geographical areas. The results of the investiga

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8

Subramanian, Avudainayagam. "Long-term tannery waste contamination: effect on chromium chemistry / by Avudainayagam Subramanian." 2002. http://hdl.handle.net/2440/21824.

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Corrigenda inside front cover.<br>Includes bibliographical references (leaves 205-232)<br>xii, 232, [27] leaves : ill., plates ; 30 cm.<br>Title page, contents and abstract only. The complete thesis in print form is available from the University Library.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Soil and Water, 2002

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9

Kamaludeen, Sara Parwin Banu. "Biotic-abiotic transformations of chromium in long-term tannery waste contaminated soils : implications to remediation / by Sara Parwin Banu Kamaludeen." Thesis, 2002. http://hdl.handle.net/2440/21767.

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Bibliography: leaves 166-180.<br>180, [4] leaves : ill. (chiefly col.) ; 30 cm.<br>Determines the effect of chromium on the soil microbial community and its activity, the biotic-abiotic mechanisms involved in chromium oxidation, and phytostabilization of chromium using plants and organic amendment in tannery-waste contaminated soil.<br>Thesis (Ph.D.)--University of Adelaide, Dept. of Soil and Water, 2002

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10

Like, David E. "Management of chromium wastes in industry." Thesis, 1991. http://hdl.handle.net/1957/37990.

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Chromium hydroxide sludge is the end product of the aluminum phosphate coating process used by a truck manufacturer in the Pacific Northwest. This sludge is listed as an (F019) hazardous waste by the Environmental Protection Agency, and must be landfilled in a hazardous waste landfill site. The purpose of this thesis is to evaluate the characteristics of this sludge, and to then recommend suitable methods for handling and disposal. The chemical analysis of the sludge found total chromium to be 5.4% by weight. Industrial hygiene monitoring found the highest concentrations of 0.002 mg/m3 total c

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11

Ochonogor, Oluchuku Richie. "Phytoextraction of chromium and iron from contaminated soil using psoralea pinnata." Diss., 2014. http://hdl.handle.net/10500/13508.

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The overall efficiency of plants to remediate soils contaminated by metals depends on their growth ability especially on soils with low-fertility. For twelve weeks, the ability of Psoralea pinnata to grow well and remove chromium and iron from artificially contaminated soil was tested. The concentrations of chromium and iron in two soils obtained from different sources namely, University of South Africa premises (US) and commercial potting soil (PS) were 80 ppm, 130ppm, 180ppm, 230ppm, 280ppm, 330ppm, 380pp, 430ppm and 480ppm. Psoralea pinnata was transplanted into the contaminated soils and t

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12

Ball, Bruce L. "Soil column desorption studies on a chromium contaminated soil." Thesis, 1992. http://hdl.handle.net/1957/36512.

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Soil column studies were performed on a chromium contaminated soil from the United Chrome Products Superfund Site currently undergoing a pump-and-treat cleanup process. The goal of the research was to provide insight into the feasibility of chemically changing the injection fluid of the pump-and-treat system to enhance hexavalent chromium (Cr(VI)) mobility. The parameters tested were pH, ionic strength, and competitive anion type and concentration. Ionic strength effects were investigated by adjusting the NaCl concentration of the extracting solution and by observing the influence of varying a

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13

Muller, Heike K. "Laboratory study of chromium sorption and desorption in undisturbed soil." Thesis, 1992. http://hdl.handle.net/1957/36308.

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14

Osathaphan, Khemarath. "Multi-metal equilibrium sorption and transport modeling for copper, chromium, and arsenic in an iron oxide-coated sand, synthetic groundwater system." Thesis, 2001. http://hdl.handle.net/1957/32443.

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The mixed metal compound, Chromated Copper Arsenate, or CCA, has been widely used as a wood preservative. The metal ions in CCA, CrO��, Cu��, and AsO��, have been found in contaminated surface and subsurface soils and groundwater nearby some wood preservative facilities and nearby wood structures. Iron oxides are a ubiquitous soil-coating constituent and are believed to be a main factor in controlling the transport and fate of many metals in the soil solution. In this research, iron-oxide-coated sand (IOCS) is used as a surrogate soil to investigate the adsorption and transport

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15

Desta, Tsegazeab Goje. "Humic acid pretreatment for enhancing microbial removal of metals from a synthetic 'wastewater'." Thesis, 2004. http://hdl.handle.net/10413/3576.

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The presence of heavy metal ions in waste streams is one of the most pervasive environmental issues of present times. A rotating biological contactor (RBC) was used to investigate the potential capacity of microbial biofilms in remediation of the metal ion species from a mixed metal contaminated effluent solution containing Cr+3 , Pb+2 and Cu+2 , each at a concentration of 200 mg r1 • In the first part of this study the effectiveness of various support materials for the development of microbial biofilms capable of removing heavy metals from a synthetic effluent was investigated. EDX analysis s

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16

Aigbe, Uyiosa Osagie. "Groundwater purification using functionalised magnetic nanoparticles (electromagnetic separation)." Thesis, 2018. http://hdl.handle.net/10500/25161.

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Most developing countries are faced with drinking water problems, with conditions becoming more severe due to water pollution. Meeting the growing demands for clean water in most countries, there are difficult challenges as the availability and supply of drinkable water are diminishing. Due to economic and environmental concerns, development of additional physical means for the removal of organic compounds from wastewater using permanent magnets, electromagnetic coils, electrodes and ultrasonic pretreatment is desirable. Improving the adsorption and separation process, magnetic field exposure

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