火焰原子吸收光谱法测定模拟尘铅中铅的前处理方法探讨

分别用酸煮法和索氏提取法对模拟尘铅样品进行前处理,采用火焰原子吸收光谱法测定,方法线性范围0.08~1.50 mg/L,检出限为0.025 mg/L。对两种前处理效果作了比较,结果表明,采用酸煮法,6次重复测量的相对标准偏差小于2%,加标回收率为90.0%~102%;索氏提取法受装置影响,提取效率不稳定,6次重复测量的相对标准偏差小于11%,加标回收率为81.5%~82.6%,酸煮法的效果优于索氏提取法。

Research on Pretreatments of Simulated Leaddust for Lead Determination by Flame Atomic Absorption Spectrometry

Acid digestion and Soxhlet extraction method were adopted respectively to pre-treat the simulated Leaddust samples.Lead content was determined using Flame Atomic Absorption Spectrometry with linear range of 0.08~1.50 mg/L and detection limit of 0.025mg/L.The comparison results showed that the RSD from six duplicate for acid digestion was less than 2% and the spike recovery was 90.0%~102%.While for the Soxhlet-extraction,the extraction efficiency was not stable due the determination was limited by apparatus.The RSD from six duplicate was less than 11% and the spike recovery was 81.5%~82.6%.Therefore the effect of acid digestion was better than Soxhlet extraction.