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New Method for Thioarsenate Preservation in Iron-rich Waters by Solid Phase Extraction

Title data

Ullrich, Maria K. ; Misiari, Valentina ; Planer-Friedrich, Britta:
New Method for Thioarsenate Preservation in Iron-rich Waters by Solid Phase Extraction.
In: Water Research. Vol. 102 (October 2016) . - pp. 542-550.
ISSN 0043-1354
DOI: https://doi.org/10.1016/j.watres.2016.07.008

Abstract in another language

In order to preserve iron-rich samples for arsenic speciation analysis, mineral acids or EDTA are typically added to prevent oxidation and precipitation of iron. However, when sulfide is present, and thioarsenates ([HAsVS-IInO4-n]2-, n = 1 - 4) can form, these methods are unsuitable due to arsenic sulfide precipitation or artifact speciation changes. Here, a new method based on separating the anionic arsenic species from cationic iron in the presence of sulfide via solid phase extraction (SPE) has been investigated. Synthetic solutions containing arsenite, arsenate, monothioarsenate, and trithioarsenate were passed through the anion-exchange resin AG2-X8, after which the resin was washed, eluted, and speciation of each step analyzed by IC-ICP-MS. Retention on the resin of 96.8 ± 0.2 %, 98.8 ± 0.2 %, and 99.6 ± 0.3 % was found for arsenate, monothioarsenate, and trithioarsenate, respectively. Cationic iron (90 µM Fe(II)) was not retained (0.4 ± 0.2 %). Uncharged arsenite passed through the resin in the absence of sulfide, while 47.3 % of arsenite were retained at tenfold sulfide excess via thiol groups binding to the organic resin structure. Elution with 3 x 15 mL of 0.5 M salicylate, including a soak time, resulted in quantitative recovery of all retained species. Stability of the retained species on the resin was tested with iron-rich, natural waters from a Czech mineral spring. Arsenate, monothioarsenate, dithioarsenate, and trithioarsenate were successfully separated from iron and recovered after 6 d. Thus, SPE presents a viable answer to the problem of preserving arsenic in the presence of both iron and sulfide.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER136952
Keywords: Inorganic arsenic speciation; Ion exchange column; Stabilization method; Pre-concentration; Adsorption
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 19 Jan 2018 08:27
Last Modified: 19 Jan 2018 08:27
URI: https://eref.uni-bayreuth.de/id/eprint/41414