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- W259618886 abstract "The influence of various agents on the effectiveness of As(V) to As(III) pre-reduction in the presence of L-cysteine and arsine generation efficiency in the determination of total arsenic content in natural materials has been investigated. Determination was performed with batch hydride generation system (AAS). Under optimum conditions for arsine generation (HCl and HNO 3 : 1 mol L - 1 , NaBH 4 : 3% m/v, L-cysteine: over 0.05% m/v) the drop of the measured absorbance signal was observed. Optimum concentration of L-cysteine was established to be 0.03% m/v. This is significantly less than required for quantitative pre-reduction of As(V) to As(III), which is achieved for at least 10-fold higher L-cysteine concentration. The L-cysteine concentration, which is needed to perform the complete reduction of As(V) to As(III) as well as to achieve the precise results of determination, depends on the kind of the natural material examined and on the appropriate dilution of the sample before the measurement." @default.
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- W259618886 date "2003-01-01" @default.
- W259618886 modified "2023-10-18" @default.
- W259618886 title "Effectiveness of L-cysteine as a pre-reducing agent in the process of arsenic determination in natural materials by batch system hydride generation atomic absorption spectrometry (HG AAS)" @default.
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