Thiolated arsenic in natural systems: What is current, what is new and what needs to be known
Article
Article Title | Thiolated arsenic in natural systems: What is current, what is new and what needs to be known |
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ERA Journal ID | 5817 |
Article Category | Article |
Authors | Herath, Indika (Author), Vithanage, Meththika (Author), Seneweera, Saman (Author) and Bundschuh, Jochen (Author) |
Journal Title | Environment International |
Journal Citation | 115, pp. 370-386 |
Number of Pages | 17 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0160-4120 |
1873-6750 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.envint.2018.03.027 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0160412018301107 |
Abstract | Thiolated arsenic compounds are the sulfur analogous substructures of oxo-arsenicals as the arsinoyl (As = O) is substituted by an arsinothioyl (As = S) group. Relatively brief history of thioarsenic research, mostly in the current decade has endeavored to understand their consequences in the natural environment. However, thioarsenic related aspects have by far not attached much research concern on global scale compared to other arsenic species. This review attempts to provide a critical overview for the first time on formation mechanisms of thioarsenicals, their chemistry, speciation and analytical methodologies in order to provide a rational assessment of what is new, what is current, what needs to be known or what should be done in future research. Thioarsenic compounds play a vital role in determining the biogeochemistry of arsenic in sulfidic environments under reducing conditions. Thioarsenic species are widely immobilized by naturally occurring processes such as the adsorption on iron (oxyhydr)oxides and precipitation on iron sulfide minerals. Accurate measurement of thioarsenic species is a challenging task due to their instability upon pH, temperature, redox potential, and concentrations of oxygen, sulfur and iron. Assessment of direct and indirect effects of toxic thioarsenic species on global population those who frequently get exposed to high levels of arsenic is an urgent necessity. Dimethylmonothioarsinic acid (DMMTAV) is the most cytotoxic arsenic metabolite having similar toxicological effects as dimethylarsinous acid (DMAIII) in human and animal tissues. The formation and chemical analysis of thioarsenicals in soil and sediments are highly unknown. Therefore, future research needs to be more inclined towards in determining the molecular structure of unknown thioarsenic complexes in various environmental suites. Contemporary approaches hyphenated to existing technologies would pave the way to overcome critical challenges of thioarsenic speciation such as standards synthesis, structural determination, quantification and sample preservation in future research. |
Keywords | Thioarsenicals, Arsenic, Speciation, Kinetics, Thermodynamics, Thiolation |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 401199. Environmental engineering not elsewhere classified |
370104. Atmospheric composition, chemistry and processes | |
340603. Colloid and surface chemistry | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Civil Engineering and Surveying |
International Centre for Applied Climate Science | |
Centre for Crop Health | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q769v/thiolated-arsenic-in-natural-systems-what-is-current-what-is-new-and-what-needs-to-be-known
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