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

Titelangaben

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

Abstract

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.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER136952
Keywords: Inorganic arsenic speciation; Ion exchange column; Stabilization method; Pre-concentration; Adsorption
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie > Professur Umweltgeochemie - Univ.-Prof. Dr. Britta Planer-Friedrich
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 19 Jan 2018 08:27
Letzte Änderung: 19 Jan 2018 08:27
URI: https://eref.uni-bayreuth.de/id/eprint/41414