Picture of a black hole

Strathclyde Open Access research that creates ripples...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of research papers by University of Strathclyde researchers, including by Strathclyde physicists involved in observing gravitational waves and black hole mergers as part of the Laser Interferometer Gravitational-Wave Observatory (LIGO) - but also other internationally significant research from the Department of Physics. Discover why Strathclyde's physics research is making ripples...

Strathprints also exposes world leading research from the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

Discover more...

Arsenic speciation in the field

Torrance, Keith and Keenan, Helen and Munk, LeeAnn and Hagedorn, Birgit (2011) Arsenic speciation in the field. In: Emerging Analytical Professionals RSC, 2011-05-06 - 2011-05-08. (Unpublished)

Full text not available in this repository. (Request a copy from the Strathclyde author)

Abstract

Arsenic contamination of drinking water is widely recognised as a major public health concern, with global hotspots in Bangladesh, India, Argentina and China. This is not solely a problem that affects developing countries; it is estimated that over 13 million consumers in North America, primarily in western states, rely on groundwater with an arsenic content of greater than 10µg/L (USEPA) and require treatment. Alaska is typical of many western states in that arsenic contamination of groundwater is both natural and anthropogenic in origin. The latter is directly attributable to metal mining operations that expose sulphide minerals, especially arsenopyrite (FeAsS), to air oxidation and decomposition, with subsequent release of toxic metals. Arsenic is particularly mobile in aqueous environments because it exists as various anionic species in trivalent and pentavalent oxidation states. Further, the toxic trivalent species H3AsO3 has neutral charge in acidic conditions and therefore is not readily absorbed by clay minerals. Consequently, the oxidation state of arsenic in water samples is of great importance in predicting toxicity and mobility. Preservation of arsenic speciation is difficult and a number of different procedures have been proposed, but there is always some possibility of species transformation between the sample site and the laboratory. Separation of arsenic species at the sampling point is therefore an attractive alternative.