浊点萃取-火焰原子吸收光谱法测定啤酒中痕量铅

Determination of trace lead in beer by cloud point extraction-flame absorption spectrometry

研究了以双硫腙作为络合剂、聚乙二醇辛基苯基醚(TritonX-100)为萃取剂的浊点萃取-火焰原子吸收光谱法(CPE-FAAS)测定酒中痕量铅的方法。研究了pH、平衡温度和平衡时间、络合剂用量、萃取剂用量和共存离子干扰等对萃取效果的影响。方法线性范围为100～800μg/L,检出限为3.25μg/L,回收率在95.9%～98.7%之间。方法简单、安全、快捷、灵敏、高效,适于啤酒中痕量铅的含量测定。

A new method for determination of trace lead in beer by flame atomic absorption spectrometry combined with cloud point extraction was developed. The cloud point extraction system was based on TritonX-100 as surfactant and Dithizone as complexing agent. The parameters affecting cloud point extraction, including pH, extraction temperature and time, dosage of extraction agent and complexing agent were investigated and optimized.Under the optimum conditions,a good linearity was observed for lead in the range of 100-800μg/L with the detection limit of 3.25μg/L.The recovery was in the range of 95.9% -98.7%.The method was rapid, accurate, simple and was applied to the determination of lead in beer.