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Determination of Arsenic in Lead-based Alloy Using Hydride Generation-Atomic Fluorescence Spectrometry

Song Xue-Jie1,2,Guo Peng-Ran1,2,Chen Hang-Ting1,Duan Tai-Cheng11(State Key Laboratory of Electroanalytical Chemistry,National Analytical Research Center of Electrochemistry & Spectroscopy,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022)2(Graduate School of the Chinese Academy of Sciences,Beijing 100039)  
A simple method based on hydride generation(HG)-AFS for the determination of As in lead-based alloys was developed.Interferences caused by co-existing elements were investigated and minimized successfully.The conditions for the hydride generation technique and instrumental parameters were also optimized.KBH4 concentration was fixed in 1.0%(m/V).Optimized HCl concentration in the sample and carrier solution was 10%(V/V) and 5%(V/V),respectively.Experiments showed that no interference caused by Cu was observed when thiourea existed and interferences caused by Sb,Sn and Bi could be eliminated by absorbing their corresponding hydrides using 0.5%(m/V) KMnO4 solution on-line.Feasibility of this method was demonstrated by determination of two certified lead-based alloys,and the results obtained by standard addition agreed well with certified values.The method detection limit was 0.17 μg/L and RSD was 1.5% for 11 consecutive determinations of 40 μg/L As standard solution.
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