NDLI: Investigation of sequential and enzymatic extraction of arsenic from drinking water distribution solids using ICP-MS

Content Provider	Royal Society of Chemistry (RSC)
Author	Creed, Patricia A. Gallawa, Christina M. Lytle, Darren Sorg, Thomas J. Young, Andrea R. Creed, John T. Schwegel, Carol A.
Copyright Year	2006
Abstract	A sequential extraction approach was utilized to estimate the distribution of arsenite [As(III)] and arsenate [As(V)] on iron oxide/hydroxide solids obtained from drinking water distribution systems. The arsenic (As) associated with these solids can be segregated into three operationally defined categories (exchangeable, amorphous and crystalline) according to the sequential extraction literature. The exchangeable As, for the six drinking water solids evaluated, was estimated using 10 mM MgCl2 and 10 mM NaH2PO4 and represented between 5–34% of the total As available from the solid. The amorphously bound As was estimated using 10 mM (NH4)2C2O4 and represented between 57–124% of the As available from the respective solid. Finally, the crystalline bound As was estimated using titanium citrate and this represented less than 1.5% of the As associated with the solids. A synthetic stomach/intestine extraction approach was also applied to the distribution solids. The stomach fluid was found to extract between 0.5–33.3 μg g−1 As and 120–2360 μg g−1 iron (Fe). The As concentrations in the intestine fluid were between 0.02–0.04 μg g−1 while the Fe concentration ranged from 0.06–0.7 μg g−1 for the first six drinking water distribution solids. The elevated Fe levels associated with the stomach fluid were found to produce Fe based precipitates when the intestinal treatment was applied. Preliminary observations indicate that most of the aqueous Fe in the stomach fluid is ferric ion and the observed precipitate produced in the intestine fluid is consistent with the decreased solubility of ferric ion at the pH associated with the intestine.
Starting Page	968
Ending Page	972
Page Count	5
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	8
Issue Number	9
Journal	Journal of Environmental Monitoring
DOI	10.1039/b604569c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Arsenite Arsenate Iron oxide Hydroxide Arsenic Titanium Citric acid Gastrointestinal tract Ion PH
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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