Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 46, Issue 12, Pages 2231-2247Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-017-0699-3
Keywords
Arsenic speciation; Potentiometry; Arsenic oxyanions-metal cation interactions; Arsenic adsorption equilibria
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Funding
- ANII Uruguay [FCE 2011_1_6491]
- CSIC Uruguay
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The interaction of arsenic(V) and arsenic(III) oxyanions with metal cations was investigated by potentiometry under temperature and ionic strength conditions approaching those prevailing in natural waters. The selection includes the major metal cations and some other ions of high environmental relevance. Ionic pairs [M((AsO4)-O-V)](-), [M((HAsO4)-O-V)] and [M((H2AsO3)-O-III)](+) formation is suggested for all +2 metal cations, based on the potentiometric results. These ion-pairs between arsenic anions and other metal cations are hardly ever mentioned or taken into account when arsenic speciation in natural waters is considered. These results provide the basis for studying arsenic speciation in natural aquatic systems, on which environmental fate, bioavailability and toxicity of the element depend. Some extrapolations to the conditions of the natural waters are presented as well as some insights into the adsorption process onto hydrous oxides.
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