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Abstract
A simple and fast resonance Rayleigh scattering (RRS) method for the determination of arsenic was developed. The method is based on the formation of ion-association complexes {(IG)3·[As2(Mo2O7)12]H5}m of iodine green (IG) and heteropoly acid anion [As2(Mo2O7)12]14− formed as As (V) reacts with molybdate in H2SO4 solution. The ion-association complexes can lead to distinct enhancement of RRS. The enhanced RRS intensity is proportional to the concentration of As (V) in the range of 0.008–0.40 µg ml−1. The optimum conditions, the influence factors for the reaction, and the effects of coexisting substances have been investigated. The method has high sensitivity and good selectivity; the detection limit for As (V) (3 S 0/S) is 1.50 ng ml−1. The method can be applied to the determination of As (V) in hair samples. Furthermore, the mechanism of the reaction and the reasons for RRS enhancement is discussed.