Abstrakt
The work was focused on the development of analytical method for determination of arsenic in water sample using of its volatile compounds generation. The method involves the combination of flow injection analysis, UV-photochemical generation of volatile compounds of arsenic and atomic absorption.
Attained absorbance was very low after the optimization. In next step, the influence of selected interferents on UV-photochemical generation was investigated with the aim to find a suitable reaction modifier which would improve sensitivity of arsenic determination.
Bi3+ was found as the best reaction modifier for its persisting effect. The activation with concentration of 10 mg L-1 of Bi3+ increases the absorbance of arsenic approximately eleven times compared to signals without activation.
The limit of detection achieved was 18 mu g L-1, sensitivity was 1.144x10(-3) L mu g(-1), repeatability was 4.5 % (relative standard deviation) and linear dynamic range was 60-500 mu gL(-1).