火焰原子吸收光谱法测定不锈钢中铅

Determination of lead in stainless steel by flame atomic absorption spectrometry

不锈钢样品经王水溶解后,用火焰原子吸收光谱法测定了样品中铅的含量,建立了测定复杂体系中痕量铅的简便方法。对仪器参数进行了优化;考察了样品中的干扰。结果表明,采用氘灯背景校正和标准加入法消除样品测试过程中的背景干扰和非光谱干扰后,方法线性范围为0.035～9μg/mL,检出限为0.035μg/mL。将本方法应用于不锈钢光谱分析标准物质GBW 01664中铅的测定,测得结果与认定值一致,相对标准偏差(n=7)为0.97%。将本方法用于实际样品分析,结果的相对标准偏差(n=7)为0.57%～0.62%,加标回收率为96%～102%。

Lead in stainless steel was determined by flame atomic absorption spectrometry after disso lution 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 investiga ted. The results indicated that deuterium lamp background correction and the standard addition meth od were applied to eliminate the background interference and nonspectral interference during the sam ple test process. The linear range was 0. 0359μg/mL and the detection limit was 0. 035μg/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 de viations （n=7） were 0. 57%-0. 62% and the recoveries were 96%-102%.