title: Rapid on-site separation of As(III) and As(V) in waters using a disposable thiol-modified sand cartridge.
abstract: 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.
authors.affiliation: State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Du
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Che
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Zhang
authors.forename: Chuanyong
authors.initials: C
authors.lastname: Jing
mesh_terms: D001151:Arsenic / Q000737:chemistry* / Q000302:isolation & purification*; D002140:California; D005591:Chemical Fractionation / Q000295:instrumentation*; D004209:Disposable Equipment; D060587:Groundwater / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D012822:Silicon Dioxide / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D014881:Water Supply / Q000032:analysis
chemical_list: D013438:Sulfhydryl Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D012822:Silicon Dioxide; D001151:Arsenic
keywords: Arsenic speciation; Disposable cartridge; Groundwater; Leachant; Thiol-modified sand