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Rapid on‐site separation of As(III) and As(V) in waters using a disposable thiol‐modified sand cartridge
Author(s) -
Du Jingjing,
Che Dongsheng,
Zhang Jianfeng,
Jing Chuanyong
Publication year - 2014
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1002/etc.2573
Subject(s) - cartridge , extraction (chemistry) , groundwater , environmental chemistry , chromatography , arsenic , chemistry , leaching (pedology) , adsorption , toxicity characteristic leaching procedure , contamination , thiol , genetic algorithm , environmental science , geology , soil water , materials science , organic chemistry , soil science , ecology , heavy metals , geotechnical engineering , biology , metallurgy
The rapid redox transformation of arsenic (As) species in waters presents a great environmental challenge in the accurate determination of its concentration and toxicity. The motivation of the present study was therefore to develop a method for rapid on‐site separation of As(V) and As(III) in various aqueous matrices. The authors synthesized a thiol‐modified sand (T‐sand) that selectively removed As(III) but did not adsorb As(V). The novel application of this T‐sand in a disposable cartridge was able to successfully separate As(V) (37–970 µg L −1 ) and As(III) (not detected to 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 high‐performance liquid chromatography–atomic fluorescence spectrometry. 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;33:1692–1696 . © 2014 SETAC