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Journal articles on the topic 'Direct speciation analysis'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Krull, Ira S., and Kenneth W. Panaro. "Trace Analysis and Speciation for Methylated Organotins by HPLC-Hydride Generation-Direct Current Plasma Emission Spectroscopy (HPLC-HY-DCP)." Applied Spectroscopy 39, no. 6 (1985): 960–68. http://dx.doi.org/10.1366/0003702854249402.

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Total tin determinations can be accomplished at trace levels (10–25 ppb) by a continuous on-line hydride generation (HY), followed by direct current plasma (DCP) emission spectroscopy (HY-DCP). This approach is applicable for organotin compounds such as mono-, di-, and trimethyltin chloride, as well as stannous and stannic cations. HY-DCP methods of total tin analysis have been applied to a number of spiked and actual samples. Detection limits, calibration plots, sensitivities, and related analytical parameters have been evaluated. Organotin analysis and speciation can be accomplished by the i

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Mladenova, Elisaveta, Ivanka Dakova, Dimiter Tsalev, and Irina Karadjova. "Mercury determination and speciation analysis in surface waters." Open Chemistry 10, no. 4 (2012): 1175–82. http://dx.doi.org/10.2478/s11532-012-0027-0.

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AbstractA sorbent L-cysteine grafted silica gel has been evaluated for separation and enrichment of dissolved inorganic i-Hg(II) and methylmercury CH3Hg(I) from surface waters at sub-µg L−1 concentrations. Chemical parameters for mercury species enrichment and separation have been optimized. Analytical schemes for the determination of Hg species, using selective column solid phase extraction (SPE) with continuous flow chemical vapor generation atomic absorption spectrometry (CF-CVG-AAS) or inductively coupled plasma-mass spectrometry (ICP-MS) were developed. Possibilities for on-site SPE enric

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Karpukhina, Evgeniya A., Elena A. Vlasova, Dmitry S. Volkov, and Mikhail A. Proskurnin. "Comparative Study of Sample-Preparation Techniques for Quantitative Analysis of the Mineral Composition of Humic Substances by Inductively Coupled Plasma Atomic Emission Spectroscopy." Agronomy 11, no. 12 (2021): 2453. http://dx.doi.org/10.3390/agronomy11122453.

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Five sample-preparation techniques were compared to quantify 31 elements in coal humic substances (HS) by ICP–AES from the viewpoints of complete isolation and speciation of elements. They include, for bulk composition, preparation of an aqueous colloidal HS solution followed by direct injection of the sample without decomposition and ashing followed by metaborate fusion; for element speciation, preparation of an aqueous colloidal HS solution followed by centrifugation and direct analysis without decomposition for water-soluble species; treatment with boiling nitric acid; and microwave-assiste

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Lajin, Bassam, and Walter Goessler. "Direct speciation analysis of organophosphorus environmental pollutants in water by HPLC-ICPMS/MS." Talanta 196 (May 2019): 357–61. http://dx.doi.org/10.1016/j.talanta.2018.12.075.

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Peng, Congnan, Juntong Zhou, Chi Li, Yuxin Chen, Qing Huo, and Fei Xie. "Research progress on speciation analysis of arsenic in traditional Chinese medicine." Open Chemistry 20, no. 1 (2022): 23–39. http://dx.doi.org/10.1515/chem-2022-0123.

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Abstract Traditional Chinese medicine contains arsenic (As), which in the natural environment accumulates in plants during the growth of Chinese medicinal materials; there are mineral medicines containing As in Chinese patent medicine such as As4S4, As2S3, etc. Due to the toxicity of As-containing compounds and its role in inflammation and treatment of cancers such as leukemia, it is necessary to analyze the chemical form of As. A comprehensive investigation of the compound forms of heavy metals rather than the simple total amount of elements will lay the foundation for the scientific and obje

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Ortega, Richard. "Direct speciation analysis of inorganic elements in single cells using X-ray absorption spectroscopy." J. Anal. At. Spectrom. 26, no. 1 (2011): 23–29. http://dx.doi.org/10.1039/c0ja00153h.

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Kińska, Katarzyna, Barbara Żelazko, Olga Gajewska, Magdalena Borowska, Monika Sadowska, and Beata Krasnodębska-Ostręga. "Separation of Inorganic Forms of Tellurium Using On-Site SPE Followed by ICP-MS or ICP-OES—The Right Solution for Water Monitoring." Molecules 30, no. 2 (2025): 303. https://doi.org/10.3390/molecules30020303.

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Tellurium, recognized as one of the technology-critical elements, should be considered as a xenobiotic. Its application, i.a. in the growing photovoltaic industry, raises concerns about Te(IV) and Te(VI) release to the environment. As both forms differ in mobility and toxicity, Te speciation should be included in water monitoring, but problems with speciation changes occurring during sampling, transport, and sample storage require the use of on-site separation of Te forms. A simple procedure based on solid phase extraction (SPE) with the anionic exchange mechanism (SAX, involving commercially

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Lowry, David B., Jennifer L. Modliszewski, Kevin M. Wright, Carrie A. Wu, and John H. Willis. "The strength and genetic basis of reproductive isolating barriers in flowering plants." Philosophical Transactions of the Royal Society B: Biological Sciences 363, no. 1506 (2008): 3009–21. http://dx.doi.org/10.1098/rstb.2008.0064.

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Speciation is characterized by the evolution of reproductive isolation between two groups of organisms. Understanding the process of speciation requires the quantification of barriers to reproductive isolation, dissection of the genetic mechanisms that contribute to those barriers and determination of the forces driving the evolution of those barriers. Through a comprehensive analysis involving 19 pairs of plant taxa, we assessed the strength and patterns of asymmetry of multiple prezygotic and postzygotic reproductive isolating barriers. We then reviewed contemporary knowledge of the genetic

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Bresson, Carole, Christèle Colin, Frédéric Chartier, and Christophe Moulin. "Cobalt Speciation Study in the Cobalt—Cysteine System by Electrospray Ionization Mass Spectrometry and Anion-Exchange Chromatography Inductively Coupled Plasma Atomic Emission Spectrometry." Applied Spectroscopy 59, no. 5 (2005): 696–705. http://dx.doi.org/10.1366/0003702053945912.

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This paper describes the ability of the combination of electrospray ionization mass spectrometry (ESI-MS) and anion-exchange chromatography coupled with inductively coupled plasma atomic emission spectrometry (AEC-ICP-AES) for cobalt speciation study in the binary cobalt–cysteine system. ESI-MS, allowing the identification and the characterization of the analytes, is used as a technique complementary to AEC-ICP-AES, providing elemental information on the separated species. The methods have been developed through the study of samples containing Co2+ and 1-fold to 5-fold molar ratios of cysteine

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Bacquart, Thomas, Guillaume Devès, and Richard Ortega. "Direct speciation analysis of arsenic in sub-cellular compartments using micro-X-ray absorption spectroscopy." Environmental Research 110, no. 5 (2010): 413–16. http://dx.doi.org/10.1016/j.envres.2009.09.006.

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Díaz-Pérez, Mónica, Manuel Aboal-Somoza, Pilar Bermejo-Barrera, and Adela Bermejo-Barrera. "Direct Speciation Analysis of Sb(III) and Sb(V) Based on Their Different Sensitivities for GFAAS." Spectroscopy Letters 44, no. 1 (2011): 17–21. http://dx.doi.org/10.1080/00387010903397802.

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Fodor, Blanka, Imre Boldizsár, and Ibolya Molnár-Perl. "Alkylsilyl speciation and direct sample preparation of plant cannabinoids prior to their analysis by GC-MS." Analytica Chimica Acta 1021 (August 2018): 51–59. http://dx.doi.org/10.1016/j.aca.2018.03.049.

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Etschmann, Barbara E., Erica Donner, Joël Brugger, et al. "Speciation mapping of environmental samples using XANES imaging." Environmental Chemistry 11, no. 3 (2014): 341. http://dx.doi.org/10.1071/en13189.

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Environmental context Recently developed fast fluorescence detectors have opened the way to the development of element speciation mapping, i.e. X-ray absorption near edge spectroscopy (XANES) imaging, of environmental samples. This technique is potentially very informative but is also highly data intensive. Here, we used XANES imaging to explore the distribution of Cu species in biosolid materials, destined for agricultural use, as this is of importance in relation to the bioavailability and potential toxicity of this metal. Abstract Fast X-ray detectors with large solid angles and high dynami

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Green, C. A., B. A. Harrison, T. Klein, and V. Baimai. "Cladistic analysis of polytene chromosome rearrangements in anopheline mosquitoes, subgenus Cellia, series Neocellia." Canadian Journal of Genetics and Cytology 27, no. 2 (1985): 123–33. http://dx.doi.org/10.1139/g85-020.

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New data on rearrangements of ovarian polytene chromosomes from mosquitoes are presented for the following species in the series Neocellia of Anopheles (Cellia): annularis, philippinensis, nivipes, splendidus, jamesii, and ramsayi. Rearrangement has involved fixation of alternatives for paracentric inversions. Two fixed inversion differences allow for the first time the direct identification of wild-caught females of philippinensis and nivipes. There is a suggestion that the latter nominal species may include two genetic species. These data and those published for close relatives are drawn tog

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McClenny, W. A., K. J. Krost, E. H. Daughtrey, D. D. Williams, and G. A. Allen. "Speciation of Ambient Sulfate Particulate Matter Using FT-IR-Based Absorption to Complement Wet Chemical and Thermal Speciation Measurements." Applied Spectroscopy 48, no. 6 (1994): 706–12. http://dx.doi.org/10.1366/000370294774368956.

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The direct, nondestructive, infrared transmission measurement of fine particles (<2.5 μm) on Teflon® filters was successfully used to unambiguously identify and to quantify ammonium bisulfate in particle samples collected from the ambient air. The samples were collected at 10 L/min over 23 hours for 24 consecutive summer days (21 July-14 August) in 1991 in a rural setting near State College, PA. These measurements were combined with wet chemical measurements of the same samples to infer the partition of particulate sulfate as ammonium sulfate, ammonium bisulfate, and sulfate associated with

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Marini, Carlo, Josep Roqué-Rosell, Marc Campeny, Shiva Toutounchiavval, and Laura Simonelli. "MAP2XANES: a Jupyter interactive notebook for elemental mapping and XANES speciation." Journal of Synchrotron Radiation 28, no. 4 (2021): 1245–52. http://dx.doi.org/10.1107/s1600577521003593.

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MAP2XANES is an intuitive Jupyter notebook that automatizes the analysis of synchrotron X-ray fluorescence imaging and X-ray absorption spectroscopy for the characterization of complex and heterogeneous samples. The notebook uses basic modules and functions from Numpy, Scipy, Pandas, iPywidgets and Matplotlib libraries for a powerful data reduction process that, in just a few clicks, guides the user through the visualization of elemental maps, space-resolved absorption spectra and their automatized analysis. In particular, by means of linear combination fit of the XANES spectra, the notebook d

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Popadin, Konstantin, Konstantin Gunbin, Leonid Peshkin, et al. "Mitochondrial Pseudogenes Suggest Repeated Inter-Species Hybridization among Direct Human Ancestors." Genes 13, no. 5 (2022): 810. http://dx.doi.org/10.3390/genes13050810.

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The hypothesis that the evolution of humans involves hybridization between diverged species has been actively debated in recent years. We present the following novel evidence in support of this hypothesis: the analysis of nuclear pseudogenes of mtDNA (“NUMTs”). NUMTs are considered “mtDNA fossils” as they preserve sequences of ancient mtDNA and thus carry unique information about ancestral populations. Our comparison of a NUMT sequence shared by humans, chimpanzees, and gorillas with their mtDNAs implies that, around the time of divergence between humans and chimpanzees, our evolutionary histo

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Vrba, E. S., and D. DeGusta. "Do species populations really start small? New perspectives from the Late Neogene fossil record of African mammals." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 359, no. 1442 (2004): 285–93. http://dx.doi.org/10.1098/rstb.2003.1397.

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This analysis of all known African larger mammals of the past 10 Myr offers new perspectives on the geographical circumstances of speciation. Our central question is: does the fossil evidence support the idea that most new species start as small populations and, if true, how long is the average growth interval until species are established at their mean later size? This simple question is important to unravelling the competing claims of rival models of speciation. We approached it by direct use of fossil data, which, to our knowledge, has not been done previously. We compared the numbers of fo

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Biadun, E., M. Sadowska, N. Ospina-Alvarez, and B. Krasnodebska-Ostrega. "Direct speciation analysis of thallium based on solid phase extraction and specific retention of a Tl(III) complex on alumina coated with sodium dodecyl sulfate." Microchimica Acta 183, no. 1 (2016): 177–83. https://doi.org/10.1007/s00604-015-1624-3.

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Alumina (Al2O3) with an average particle size of 63 μm was modified with the anionic surfactant sodium dodecyl sulfate (SDS) and then applied to (i) solid phase extraction and separation of both thallium(I) and thallium(III), and (ii) preconcentration of Tl(III) from waste water samples. Only Tl(III), in the form of its complex with diethylenetriaminepentaacetate (DTPA), was retained on the sorbent, from where it can be eluted with 40 % nitric acid. Thallium species were then quantified by ICP MS. The method was characterized by a LOD of 25 pg of Tl(I) and 160 pg of

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Agnes, George R., and Gary Horlick. "Electrospray Mass Spectrometry as a Technique for Elemental Analysis: Preliminary Results." Applied Spectroscopy 46, no. 3 (1992): 401–6. http://dx.doi.org/10.1366/0003702924125311.

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Preliminary results for the analytical use of electrospray mass spectrometry (ES-MS) for elemental analysis are presented. Spectra with the declustered plus-one ion (M+) as the dominant species have been measured for the alkali metals (Li, Na, K, Rb, and Cs) and for several transition metals (Cr, Mn, Fe, Co, Ni, Cu, Zn, Ag, and Cd) in both aqueous and methanol solvents. A number of background ions are also observed including MH+, MO+, MOH+, and MOH(H2O)+. For vanadyl sulfate and uranyl nitrate, ES conditions can be adjusted to produce VO+ and UO2+ as the dominant ions in the mass spectra, indi

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Georgieva, Stela, Eduard Stefanov, and Temenuzhka Radoykova. "Direct ion chromatographic method for speciation micro analysis of arsenic forms in industrial samples with “rich” matrix composition." Journal of Chromatography A 1736 (November 2024): 465421. http://dx.doi.org/10.1016/j.chroma.2024.465421.

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Ghahraman Afshar, Majid, Gastón A. Crespo, and Eric Bakker. "Direct Ion Speciation Analysis with Ion-Selective Membranes Operated in a Sequential Potentiometric/Time Resolved Chronopotentiometric Sensing Mode." Analytical Chemistry 84, no. 20 (2012): 8813–21. http://dx.doi.org/10.1021/ac302092m.

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Mao, Wenqing, Juan Mei, Huan He, Cheng Liu, Xiuxiang Tao, and Zaixing Huang. "Bioleaching Mercury from Coal with Aspergillus flavus M-3." Microorganisms 11, no. 11 (2023): 2702. http://dx.doi.org/10.3390/microorganisms11112702.

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This study focuses on the utilization of Aspergillus flavus(M-3) for the bioleaching mercury from coal, offering an alternative and environmentally to its clean utilization. The fungus was isolated from the soil near a high mercury coal mine in Lao Ying Shan (LYS), Guizhou. Utilizing direct mercury analysis, X-ray diffraction (XRD), and Fourier Transform-Infrared (FT-IR) analysis techniques, the transformation of mercury speciation, mineral components, and organic groups in the coal were analyzed before and after the bioleaching process. The findings of the study illustrated that the fungus M-

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Kolachi, Nida F., Tasneem G. Kazi, Hassan I. Afridi, et al. "Development of Extraction Methods for Speciation Analysis of Selenium in Aqueous Extracts of Medicinal Plants." Journal of AOAC INTERNATIONAL 94, no. 4 (2011): 1069–75. http://dx.doi.org/10.1093/jaoac/94.4.1069.

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Abstract Advanced extraction methods have been developed for direct speciation of dissolved inorganic and organic selenium (Se) species in aqueous extracts of medicinal plants (MPs). The inorganic species of Se (SeIV and SeVI) were separated from organic forms by adsorbing inorganic Se on alumina, while the organic Se was not retained. The retained inorganic Se species was eluted with 10 mL 0.2 M HCl. The total inorganic Se species was determined after prereduction of SeVI into SeIV with concentrated HCl. The SeIV in the eluent and total inorganic Se species were then complexed with diethyldit

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Hsiao, I.-Lun, Yi-Kong Hsieh, Chu-Fang Wang, I.-Chieh Chen, and Yuh-Jeen Huang. "Trojan-Horse Mechanism in the Cellular Uptake of Silver Nanoparticles Verified by Direct Intra- and Extracellular Silver Speciation Analysis." Environmental Science & Technology 49, no. 6 (2015): 3813–21. http://dx.doi.org/10.1021/es504705p.

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Wang, Shuling, Xiaoyu Song, Jindong Hu, et al. "Direct speciation analysis of organic mercury in fish and kelp by on-line complexation and stacking using capillary electrophoresis." Food Chemistry 281 (May 2019): 41–48. http://dx.doi.org/10.1016/j.foodchem.2018.12.083.

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Lamarão, Flávia Rachel M., Estéfane C. Reis, Tatiana A. Simão, Rodolpho M. Albano, and Gisele Lôbo-Hajdu. "Aplysina (Porifera: Demospongiae) species identification through SSCP-ITS patterns." Journal of the Marine Biological Association of the United Kingdom 90, no. 4 (2009): 845–50. http://dx.doi.org/10.1017/s0025315409991202.

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Keratose sponges have no spicules and limited robust morphological characters, causing severe problems for taxonomic classification. Single-strand conformational polymorphism (SSCP) analysis of PCR amplified internal transcribed spacers (ITS) of nuclear ribosomal RNA (rRNA) genes was used to elucidate speciation patterns in marine sponges of the genus Aplysina. In this study, Aplysina species with non-ambiguous traditional morphological alpha taxonomy were used to generate standard SSCP-ITS patterns, which were compared with patterns from alleged new species. Our results show that ITS-SSCP pat

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Dinu, Marina, Tatyana Moiseenko, and Dmitry Baranov. "Snowpack as Indicators of Atmospheric Pollution: The Valday Upland." Atmosphere 11, no. 5 (2020): 462. http://dx.doi.org/10.3390/atmos11050462.

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Snowpack is a unique indicator in assessing both local and transboundary contaminants. We considered the features of the snow chemical composition of the Valday Upland, Russia, as a location without a direct influence of smelters (conditional background) in 2016–2019. We identified the influence of a number of geochemical (landscape), biological (trees of the forest zone, vegetation), and anthropogenic factors (technogenic elements—lead, nickel) on the formation of snow composition. We found increases in the content of metals of technogenic origin in city snowfall in the snowpack: cadmium, lea

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KNOWLES, LACEY L., and PAVEL B. KLIMOV. "Estimating phylogenetic relationships despite discordant gene trees across loci: the species tree of a diverse species group of feather mites (Acari: Proctophyllodidae)." Parasitology 138, no. 13 (2011): 1750–59. http://dx.doi.org/10.1017/s003118201100031x.

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SUMMARYWith the increased availability of multilocus sequence data, the lack of concordance of gene trees estimated for independent loci has focused attention on both the biological processes producing the discord and the methodologies used to estimate phylogenetic relationships. What has emerged is a suite of new analytical tools for phylogenetic inference – species tree approaches. In contrast to traditional phylogenetic methods that are stymied by the idiosyncrasies of gene trees, approaches for estimating species trees explicitly take into account the cause of discord among loci and, in th

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Kondratenko, Evgenii V., and Javier Pérez-Ramírez. "Mechanism and Kinetics of Direct N2O Decomposition over Fe−MFI Zeolites with Different Iron Speciation from Temporal Analysis of Products." Journal of Physical Chemistry B 110, no. 45 (2006): 22586–95. http://dx.doi.org/10.1021/jp063492w.

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Ribas, Camila C., Alexandre Aleixo, Afonso C. R. Nogueira, Cristina Y. Miyaki, and Joel Cracraft. "A palaeobiogeographic model for biotic diversification within Amazonia over the past three million years." Proceedings of the Royal Society B: Biological Sciences 279, no. 1729 (2011): 681–89. http://dx.doi.org/10.1098/rspb.2011.1120.

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Many hypotheses have been proposed to explain high species diversity in Amazonia, but few generalizations have emerged. In part, this has arisen from the scarcity of rigorous tests for mechanisms promoting speciation, and from major uncertainties about palaeogeographic events and their spatial and temporal associations with diversification. Here, we investigate the environmental history of Amazonia using a phylogenetic and biogeographic analysis of trumpeters (Aves: Psophia ), which are represented by species in each of the vertebrate areas of endemism. Their relationships reveal an unforeseen

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Bischof, Eva Alexandra, Nils Schlüter, and Jens Lehmann. "Geometric morphometric analysis of morphologic disparity, intraspecific variation and ontogenetic allometry of beyrichitine ammonoids." PLOS ONE 17, no. 2 (2022): e0263524. http://dx.doi.org/10.1371/journal.pone.0263524.

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Beyrichitine ammonoids of NV Nevada reveal a high taxonomic diversity of Anisian (Middle Triassic). This diversity is, however, in contrast to their relatively low morphologic disparity. Depending on the exact definition, morphologic disparity of a data set is a direct consequence of the sum of all ontogenetic changes. In the past, however, the interplay of both morphological processes has only rarely been addressed. Using geometric morphometric methods, this study aims at a quantification of allometric processes and the morphologic disparity of beyrichitine ammonoids. The multivariate statist

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Falistocco, Egizia, Gianpiero Marconi, and Mario Falcinelli. "Comparative cytogenetic study on Trifolium subterraneum (2n = 16) and Trifolium israeliticum (2n = 12)." Genome 56, no. 6 (2013): 307–13. http://dx.doi.org/10.1139/gen-2013-0055.

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Changes in chromosome number have played an important role in the evolution of the genus Trifolium. Along with a few species of polyploid origin there are several cases of dysploidy as evidenced by the presence of four basic chromosome numbers (x = 8, 7, 6, 5). Trifolium subterraneum and Trifolium israeliticum are related species with chromosome complements 2n = 16 and 2n = 12, respectively. Although they represent an interesting case of speciation based on chromosome number reduction, no attempts to demonstrate their cytogenetic affinity have been carried out to date. With this study we perfo

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Yang, Jiahui, Yijing Luo, Yubin Su, Yuanyuan Li, Yao Lin, and Chengbin Zheng. "Direct coupling of liquid–liquid extraction with 3D-printed microplasma optical emission spectrometer for speciation analysis of mercury in fish oil." Microchemical Journal 179 (August 2022): 107569. http://dx.doi.org/10.1016/j.microc.2022.107569.

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Procházková, Simona, Katarína Kriegerová, Iveta Boháčová, and Radoslav Halko. "Speciation analysis of chromium in water samples using nanometer zirconium dioxide and direct ultrasonic slurry sampling with electrothermal atomic absorption spectrometry." International Journal of Environmental Analytical Chemistry 99, no. 2 (2019): 157–71. http://dx.doi.org/10.1080/03067319.2019.1581884.

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Béni, Áron, Ildikó Kiss, Sándor Berényi, and József Posta. "Atomic distributions in acetylene-air flame using hydraulic high-pressure nebulization with direct (100%) introduction of solutions Applications to speciation analysis." Microchemical Journal 85, no. 1 (2007): 109–14. http://dx.doi.org/10.1016/j.microc.2006.04.016.

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Nischwitz, Volker, and Spiros A. Pergantis. "Mapping of arsenic species and identification of a novel arsenosugar in giant clams Tridacna maxima and Tridacna derasa using advanced mass spectrometric techniques." Environmental Chemistry 4, no. 3 (2007): 187. http://dx.doi.org/10.1071/en07009.

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Environmental context. Arsenic is known to accumulate in various marine organisms. The high acute toxicity of inorganic arsenic species and the potential chronic toxicity of some organoarsenic species require detailed knowledge about the occurrence and metabolism of arsenic compounds in marine organisms. The application of advanced analytical techniques still allows, even after decades of arsenic speciation, the identification of novel species. In addition, comprehensive mapping of all arsenic species present in marine organisms may allow for a more detailed understanding of arsenic metabolism

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Simon, Stephane, Aurelie Barats, Florence Pannier, and Martine Potin-Gautier. "Development of an on-line UV decomposition system for direct coupling of liquid chromatography to atomic-fluorescence spectrometry for selenium speciation analysis." Analytical and Bioanalytical Chemistry 383, no. 4 (2005): 562–69. http://dx.doi.org/10.1007/s00216-005-0056-z.

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Liang, Lina, Shumin Mo, Yaqi Cai, Shifen Mou, Guibin Jiang, and Meijuan Wen. "Direct amino acid analysis method for speciation of selenoamino acids using high-performance anion-exchange chromatography coupled with integrated pulsed amperometric detection." Journal of Chromatography A 1118, no. 1 (2006): 134–38. http://dx.doi.org/10.1016/j.chroma.2006.02.043.

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Dahl, Amy L., John Sanseverino, and Jean-François Gaillard. "Bacterial bioreporter detects mercury in the presence of excess EDTA." Environmental Chemistry 8, no. 6 (2011): 552. http://dx.doi.org/10.1071/en11043.

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Environmental contextUnderstanding the uptake of mercury by bacteria is essential for predicting the amount of toxic methyl mercury formed in the environment. This study shows that the uptake of mercury by a whole-cell bacterial biosensor as a function of a strong ligand was greater than predicted by chemical speciation measurements or equilibrium calculations. These results call into question the use of chemical measurements and equilibrium modelling for predicting the toxicity of metals to living organisms in the environment and suggest that direct biological methods yield more accurate resu

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Soares, Liliane Catone, Fernando Barboza Egreja Filho, Cláudia Carvalhinho Windmoller, and Maria Irene Yoshida. "MERCURY QUANTIFICATION IN SOILS USING THERMAL DESORPTION AND ATOMIC ABSORPTION SPECTROMETRY: PROPOSAL FOR AN ALTERNATIVE METHOD OF ANALYSIS." Revista Brasileira de Ciência do Solo 39, no. 4 (2015): 1100–1111. http://dx.doi.org/10.1590/01000683rbcs20140674.

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Despite the considerable environmental importance of mercury (Hg), given its high toxicity and ability to contaminate large areas via atmospheric deposition, little is known about its activity in soils, especially tropical soils, in comparison with other heavy metals. This lack of information about Hg arises because analytical methods for determination of Hg are more laborious and expensive compared to methods for other heavy metals. The situation is even more precarious regarding speciation of Hg in soils since sequential extraction methods are also inefficient for this metal. The aim of this

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Bermejo-Barrera, P., M. C. Barciela-Alonso, B. Pérez-Fernández, and A. Bermejo-Barrera. "Direct speciation analysis of Cr(VI) by electrothermal atomic absorption spectrometry, based on the volatilization of Cr(III)–thenoyltrifluoracetonate from the graphite furnace." Spectrochimica Acta Part B: Atomic Spectroscopy 58, no. 1 (2003): 167–73. http://dx.doi.org/10.1016/s0584-8547(02)00229-x.

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Palacios-Jordan, Héctor, Anna Jané-Brunet, Eduard Jané-Brunet, Francesc Puiggròs, Núria Canela, and Miguel A. Rodríguez. "Considerations on the Analysis of E-900 Food Additive: An NMR Perspective." Foods 11, no. 3 (2022): 297. http://dx.doi.org/10.3390/foods11030297.

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Food additives are in widespread use in the food industry to extend the shelf life of food, improve its organoleptic characteristics or facilitate industrial processing. Their use is not without controversy, which makes regulation and control crucial for food safety and public health. Among food additives, silicone-based antifoaming agents (polysiloxanes or E900) are difficult to analyze and quantify due to their polymeric nature. Currently, there is no official method of quantifying this additive in foods. In this context, nuclear magnetic resonance (NMR) is a quantitative method for speciati

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Zheng, Jian, Masaki Ohata, and Naoki Furuta. "Reversed-phase liquid chromatography with mixed ion-pair reagents coupled with ICP-MS for the direct speciation analysis of selenium compounds in human urine." Journal of Analytical Atomic Spectrometry 17, no. 7 (2002): 730–35. http://dx.doi.org/10.1039/b202531k.

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Matoušek, Tomáš, Zhifeng Wang, Christelle Douillet, Stanislav Musil, and Miroslav Stýblo. "Direct Speciation Analysis of Arsenic in Whole Blood and Blood Plasma at Low Exposure Levels by Hydride Generation-Cryotrapping-Inductively Coupled Plasma Mass Spectrometry." Analytical Chemistry 89, no. 18 (2017): 9633–37. http://dx.doi.org/10.1021/acs.analchem.7b01868.

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Negrao, Djanira R., Julio C. Cezar, Fabiano E. Montoro, Jian Wang, Charles W. Rice, and Carlos E. Driemeier. "Location, speciation, and quantification of carbon in silica phytoliths using synchrotron scanning transmission X-ray microspectroscopy." PLOS ONE 19, no. 4 (2024): e0302009. http://dx.doi.org/10.1371/journal.pone.0302009.

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Phytoliths of biogenic silica play a vital role in the silicon biogeochemical cycle and occlude a fraction of organic carbon. The location, chemical speciation, and quantification of this carbon within phytoliths have remained elusive due to limited direct experimental evidence. In this work, phytoliths (bilobate morphotype) from the sugarcane stalk epidermis are sectioned with a focused ion beam to produce lamellas (≈10 × 10 μm2 size, <500 nm thickness) and probed by synchrotron scanning transmission X-ray microspectroscopy (≈100–200 nm pixel size; energies near the silicon and carbon K-ab

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Langford, Vaughan S., Cassandra Billiau, and Murray J. McEwan. "Evaluation of the Efficacy of SIFT-MS for Speciation of Wastewater Treatment Plant Odors in Parallel with Human Sensory Analysis." Environments 7, no. 10 (2020): 90. http://dx.doi.org/10.3390/environments7100090.

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Odors from wastewater treatment plants (WWTPs) have frequently been attributed primarily to hydrogen sulfide (H2S). Low-to-medium cost hydrogen sulfide sensors have been utilized as odor indicators. However, other odorous species are usually present that may have lower odor thresholds than hydrogen sulfide. Hydrogen sulfide is not always present in odorous environments and the correlation of hydrogen sulfide to odor at a treatment facility is inconsistent. Such factors determine hydrogen sulfide an inconsistent indicator and more sophisticated measurement techniques are required to accurately

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Jin, Huagui, Yixiao Wang, Xuebin An, et al. "A Review of Fluoride Removal from Phosphorous Gypsum: A Quantitative Analysis via a Machine Learning Approach." Materials 17, no. 14 (2024): 3606. http://dx.doi.org/10.3390/ma17143606.

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This review comprehensively explores fluoride removal from phosphogypsum, focusing on its composition, fluorine-containing compounds, characterization methods, and defluorination techniques. It initially outlines the elemental composition of phosphogypsum prevalent in major production regions and infers the presence of fluorine compounds based on these constituents. The study highlights X-ray photoelectron spectroscopy (XPS) as a pivotal method for characterizing fluorine compounds, emphasizing its capability to determine precise binding energies essential for identifying various fluorine spec

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Sramkó, Gábor, Ovidiu Paun, Marie K. Brandrud, Levente Laczkó, Attila Molnár, and Richard M. Bateman. "Iterative allogamy–autogamy transitions drive actual and incipient speciation during the ongoing evolutionary radiation within the orchid genus Epipactis (Orchidaceae)." Annals of Botany 124, no. 3 (2019): 481–97. http://dx.doi.org/10.1093/aob/mcz103.

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Abstract Background and Aims The terrestrial orchid genus Epipactis has become a model system for the study of speciation via transitions from allogamy to autogamy, but close phylogenetic relationships have proven difficult to resolve through Sanger sequencing. Methods We analysed with restriction site-associated sequencing (RAD-seq) 108 plants representing 29 named taxa that together span the genus, focusing on section Epipactis. Our filtered matrix of 12 543 single nucleotide polymorphisms was used to generate an unrooted network and a rooted, well-supported likelihood tree. We further infer

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Larson, James, Monika Tokmina-Lukaszewska, Hunter Fausset, et al. "Arsenic Exposure Causes Global Changes in the Metalloproteome of Escherichia coli." Microorganisms 11, no. 2 (2023): 382. http://dx.doi.org/10.3390/microorganisms11020382.

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Arsenic is a toxic metalloid with differential biological effects, depending on speciation and concentration. Trivalent arsenic (arsenite, AsIII) is more toxic at lower concentrations than the pentavalent form (arsenate, AsV). In E. coli, the proteins encoded by the arsRBC operon are the major arsenic detoxification mechanism. Our previous transcriptional analyses indicate broad changes in metal uptake and regulation upon arsenic exposure. Currently, it is not known how arsenic exposure impacts the cellular distribution of other metals. This study examines the metalloproteome of E. coli strain

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