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Hydration of arsenic oxyacid species

Mähler, Johan and Persson, Ingmar and Herbert, Roger (2013). Hydration of arsenic oxyacid species. Dalton Transactions: an international journal of inorganic chemistry [incorporating Acta Chemica Scandinavica]. 42:5, 1364-1377
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Official URL: http://dx.doi.org/10.1039/c2dt31906c

Abstract

The bond distances in hydrated arsenic oxyacid species in aqueous solution have been studied by EXAFS spectroscopy and large angle X-ray scattering, LAXS. These results have been compared to structures in the solid state, as found in an extensive survey of available crystal structures. Protonated oxygen atoms can be distinguished with a longer As-O distance for both arsenic(V) and arsenic(III) species in the crystalline state. However, the average As-O distance for the H nAsO4(3-n)- species (0≤n≤3) remains the same. These average values are slightly shorter, ca. 0.02 Å, than in aqueous solution due to the hydration as determined by EXAFS and LAXS. The K absorption edges for arsenic(V) and arsenic(III) species are separated by 4.0 eV, and the shape of the absorption edges differs as well. Small but significant differences in the absorption edge features are seen between the neutral acids and the charged oxyacid species. The most important arsenic species from an environmental point of view is arsenous acid, As(OH)3. In addition to arsenous acid, we have used orthotelluric acid, Te(OH)6, for comparison with arsenous acid and for detailed studies of the hydration of covalently bound hydroxo groups. Arsenous acid cannot be studied with the same accuracy as orthotelluric acid, due to a relatively low solubility of As2O3(s) in neutral to acidic aqueous solution. The results from the DDIR studies support the assignment of As(OH)3 as a weak structure maker analogous to Te(OH)6, both being neutral weak oxyacids.

Authors/Creators:Mähler, Johan and Persson, Ingmar and Herbert, Roger
Title:Hydration of arsenic oxyacid species
Series/Journal:Dalton Transactions: an international journal of inorganic chemistry [incorporating Acta Chemica Scandinavica] (1477-9226)
Year of publishing :2013
Volume:42
Number:5
Page range:1364-1377
Number of Pages:14
Publisher:Royal Society of Chemistry Publishing
ISSN:1477-9226
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:X Agricola extesions > X50 Chemistry
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Inorganic Chemistry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Materials Chemistry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Physical Chemistry
Agrovoc terms:Water analysis, Water content, Water quality, Arsenic, Acids, Spectroscopy, Scattering, Environment, Developing countries
Keywords:Ground water, Drinking water, Arsenic mobilization, Arsenious acid system, Arsenic acid system, Orthotelluric acid system, Spectroscopy, X-ray scattering, Hydration, Weak oxyacids, Environment, Developing countries
URN:NBN:urn:nbn:se:slu:epsilon-e-1885
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1885
Additional ID:
Type of IDID
Web of Science (WoS)000313616600010
DOI10.1039/c2dt31906c
ID Code:11068
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Chemistry (until 131231)
Deposited By: SLUpub Connector
Deposited On:30 Apr 2014 08:33
Metadata Last Modified:23 Feb 2015 23:43

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