Determination of selenium and arsenic in mineral waters with hydride generation atomic absorption spectrometry

摘要: A continuous flow hydride generation (HG) technique was applied for the determination of Se and As in highly mineralized mineral waters. The atomization performed either conventionally a heated silica tube or graphite furnace after collection thermal decomposition hydrides. In most cases real samples not subject to serious problems. Significant matrix effects were found only waters with higher Mg, Na sulfate concentrations. With conventional through HG reasonably good linearity (r= 0.998) satisfactory precision [relative standard deviation (RSD) <5%] obtained concentration range from 1 50 µg l–1. For lower concentrations Se, situ preconcentration applied. Within 120 s introduction 150 at sample rate 0.5 ml min–1, favourable factors that yielded limit detection (3σb) 0.02 this procedure 0.5–10 l–1, RSD being 2–16% both elements under investigation.