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Determining Content of Pb in the Low-alloy Steel by Graphite Furnace Atomic Absorption Method

Wang Ying,Qi Shufang,Zhang Jie(Technology Center of Angang Steel Co.,Ltd.,Anshan 114009,Liaoning,China)  
The method for determination of trace amount of lead(Pb)in the steel by graphite furnace atomic absorption technology is proposed.The optimum conditions for analysis,the temperature rising procedures,the background interference to the device and the elimination of the interference are studied.The sample is dissolved by the dilute nitric acid and 1%NH4H2PO4 and 0.3%Mg(NO3)2 are used to be the matrix improver,and under the optimized conditions for experiment,the mass concentration of Pb appears good linear relationship in the range of 0~0.1 μg/mL,showing that the quantitative lower limit is 0.002 μg/mL and the recovery ratio of Pb in the steel with the quantitative standard solution is 92.86%~105.96%.Four kinds of standard steel samples are determined by this method which is indicating that the accuracy and precision of the method can meet the requirements specified in the standards.
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