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The Scientific World Journal
Volume 2012 (2012), Article ID 837672, 8 pages
http://dx.doi.org/10.1100/2012/837672
Research Article

Trace Level Arsenic Quantification through Cloud Point Extraction: Application to Biological and Environmental Samples

Department of Studies in Chemistry, Bangalore University, Central College Campus, Dr. Ambedkar Veedhi, Bangalore 5600 01, India

Received 17 October 2011; Accepted 30 November 2011

Academic Editor: Josefa León

Copyright © 2012 Kempahanumakkagari Suresh Kumar and Malingappa Pandurangappa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A sensitive solvent-free extraction protocol for the quantification of arsenic at trace level has been described. It is based on the reaction of arsenic (V) with molybdate in acidic medium in presence of antimony (III) and ascorbic acid as a reducing agent to form a blue-colored arsenomolybdenum blue complex. The complex has been extracted into surfactant phase using Triton X-114, and its absorbance was measured at 690 nm. The detection limit, working range, and the relative standard deviation were found to be 1 ng mL−1, 10–200 ng mL−1, and 1.2%, respectively. The effect of common ions was studied, and the method has been applied to determine trace levels of As(III) and As(V) from a variety of samples like environmental, biological, and commercially procured chemicals.