Preconcentration and Direct Determination of As and Bi in Aqueous and Solid Samples Using Hydride Generation Atomic Fluorescence Spectrometry

摘要

The present work describes the direct determination of arsenic and bismuth in solid and liquid samples using a lab-made hydride generation accessory in combination with atomic fluorescence spectrometry (HGAFS). Solid samples of talc, bismuth subcitrate, lithium carbonate, dust, soil, liquid waste, and tap water were analyzed. These samples were also analyzed using the hydride generation accessory combined with atomic absorption spectrometry (HGAAS). The limits of detection for HGAFS were 0.32 ppb and 0.30 ppb for As and Bi, respectively. The method offers on-line determination, direct solid sample analysis, pre-concentration of the liquid samples, requires low amounts of sample in comparison to non direct analysis techniques, is less costly and less complex in comparison with other direct analysis techniques. The method is capable of direct powder solid sample analysis and the recoveries were between 95% to 99.6%. The RSD (n=5) for As was 1.46% and for Bi 1.35%. The calibration curves were linear in the range of 1.0-100 ppb for As and 1.0-200 ppb for Bi.