Abstract：Lead in stainless steel was determined by flame atomic absorption spectrometry after dissolution with aqua regia. Finally, a simple method for determination of trace lead in complex system was established. Instrument parameters were optimized and the interference in the sample was investigated. The results indicated that deuterium lamp background correction and the standard addition method were applied to eliminate the background interference and non-spectral interference during the sample test process. The linear range was 0.035-9 μg/mL and the detection limit was 0.035 μg/mL. The method was applied to determine lead in stainless steel certified reference material GBW01664 for spectral analysis. The result was identical to the certified value with relative standard deviation (n=7) of 0.97%. The method was applied to the determination of actual sample, the relative standard deviations (n=7) were 0.57%-0.62% and the recoveries were 96%-102%.
