کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6326673 1619760 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arsenic speciation driving risk based corrective action
ترجمه فارسی عنوان
ارزیابی آرسنیک ریسک مبتنی بر اصلاحی
کلمات کلیدی
مقیاس آلومتریک، شکل گیری آرسنیک، محیط زیست، بهبود ارزیابی ریسک، خاک های هوای گرم، ترس،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
The toxicity of arsenic depends on a number of factors including its valence state. The more potent trivalent arsenic [arsenite (As3 +)] inhibits a large number of cellular enzymatic pathways involved in energy production, while the less toxic pentavalent arsenic [arsenate (As5 +)] interferes with phosphate metabolism, phosphoproteins and ATP formation (uncoupling of oxidative phosphorylation). Environmental risk based corrective action for arsenic contamination utilizes data derived from arsenite studies of toxicity to be conservative. However, depending upon environmental conditions, the arsenate species may predominate substantially, especially in well aerated surface soils. Analyses of soil concentrations of arsenic species at two sites in northeastern Texas historically contaminated with arsenical pesticides yielded mean arsenate concentrations above 90% of total arsenic with the majority of the remainder being the trivalent arsenite species. Ecological risk assessments based on the concentration of the trivalent arsenite species will lead to restrictive remediation requirements that do not adequately reflect the level of risk associated with the predominate species of arsenic found in the soil. The greater concentration of the pentavalent arsenate species in soils would be the more appropriate species to monitor remediation at sites that contain high arsenate to arsenite ratios.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 520, 1 July 2015, Pages 253-259
نویسندگان
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