Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1016/j.chemosphere.2007.01.019
Titel (primär) Removal of hexafluoroarsenate from waters
Autor Daus, B.; von Tümpling, W. ORCID logo ; Wennrich, R.; Weiß, H. ORCID logo
Quelle Chemosphere
Erscheinungsjahr 2007
Department FLOEK; ANA; GWS
Band/Volume 68
Heft 2
Seite von 253
Seite bis 258
Sprache englisch
Keywords hexafluoroarsenate; arsenic; herbicide; speciation; water remediation
Abstract Arsenic predominantly occurs in natural ground and surface waters as arsenate and arsenite. Other arsenic species can also be present in anthropogenically influenced waters. By means of a newly-developed speciation technique an arsenic compound was identified as hexafluoroarsenate at high concentration (about 0.8 mg l-1 as As) in a lake polluted by waste water from a former crystal glass factory. This compound shows a completely different behavior than common arsenite and arsenate in waters. However, respective literature data were little found regarding its environmental behavior as well as the applicable remediation technologies. Conventional arsenic treatment mechanisms, such as the well-known sorption to iron hydroxides, can not be used to remediate water with this compound. Hence, an effective method to remove hexafluoroarsenate from water was developed using its strong affinity to anion exchangers (strong basic exchangers with quaternary ammonium groups). The sorption can be described by a Langmuir isotherm and first-order kinetics with a half-life of about 10 min. Interferences by sulphate and fluoride, present at much higher concentrations in the polluted lake water, might be expected due to the anion exchange mechanism, but were shown to be of minor importance.
dauerhafte UFZ-Verlinkung
Daus, B., von Tümpling, W., Wennrich, R., Weiß, H. (2007):
Removal of hexafluoroarsenate from waters
Chemosphere 68 (2), 253 - 258 10.1016/j.chemosphere.2007.01.019