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This study described selenium speciation analysis under catalytic activation and/or reduction using silver nanoparticles (AgNPs) in conjunction with common flow injection (FI)-hydride generation atomic absorption spectrometry (HGAAS). Generally, Se (IV) could be directly determined by HGAAS consisting of 0.25%(w/v) NaBH4 in 0.1%(w/v) NaOH as a reductant and 2 M HCl as carrier solution, while Se (VI) could not be detected. In this regard, AgNPs in which was generated in the presence of 0.25%(w/v) NaBH4 was accordingly subjected in the same reducing background. Thus, the effects of the AgNPs on various factors affecting the Se analysis were investigated. From the results, it was demonstrated that the AgNPs gave insight into the catalytic activation for Se (IV) analysis, and also acted as pre-reducing agent for Se (VI) compared with 10%(w/v) thiourea/conc. HCl. So, the dispersed AgNPs in the HG system could serve for better sensitivity and selectivity for Se analysis. Furthermore, the conversion of Se(VI) to Se (IV) and its recovery study were validated using both of the pre-reducing agents. Both LOD and LOQ of the method were 0.5 and 1.0 μg L-1, respectively. The method precision (%RSD) was ranged of 5.69 and 3.23 for an intra-day and an inter-day analysis, respectively. Therefore, the method using AgNPs was successfully applied to determine trace amounts of Se species in drinking water samples and found in the ranges of 0.030.10, 0.12-1.0 and 0.22-0.97 μgmL-1 for Se (IV), Se (VI), and total Se, respectively.

The Effect of Silver Nanoparticles on Selenium Speciation Analysis in Water Sample by Flow Injection-Hydride Generation Atomic Absorption Spectrometry