John Wiley & Sons, Ltd.

John Wiley & Sons, Ltd.

Rapid on‐site separation of as(III) and as(V) in waters using a disposable thiol‐modified sand cartridge

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The rapid redox transformation of arsenic (As) species in waters presents a great environmental challenge in accurate determination of its concentration and toxicity. The motivation for our study is therefore to develop a method for rapid on‐site separation of As(V) and As(III) in various aqueous matrices. We synthesized a thiol‐modified sand (T‐sand), which selectively removed As(III) but did not adsorb As(V). The novel application of this T‐sand in a disposable cartridge could successfully separate As(V) (37–970 µg L−1) and As(III) (N.D.‐488 µg L−1) in 23 groundwater samples collected in areas with naturally occurring As. The As speciation results determined with T‐sand separation in the field were consistent with those obtained using HPLC‐AFS. Furthermore, the T‐sand cartridge was applicable in a wide variety of matrices including groundwater, leachants of the toxicity characteristic leaching procedure, and extracts from the California waste extraction test, sequential extraction test, and in vitro gastrointestinal extraction. This easy‐to‐use separation method is especially suitable for routine field monitoring of As speciation. Environ Toxicol Chem © 2014 SETAC

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