析相微萃取-分光光度法测定化妆品中痕量铅  

Determination of trace lead in cosmetics by microsphere phase separation extraction-spectrophotometry

作　　者：刘国霞[1] 尹继颖[2] 魏天妍[1] 张长花[1] 王彩红[1] 

机构地区：[1]滨州学院化学与化工系.山东滨州256603 [2]北京化工大学化学工程学院,北京100029

出　　处：《日用化学工业》2011年第5期388-390,共3页China Surfactant Detergent & Cosmetics

基　　金：山东省滨州学院青年人才创新基金资助项目(BZXYQNLG200825);山东省滨州学院青年资助项目(BZXYLG200504)

摘　　要：采用1-(2-吡啶偶氮)-2-萘酚(PAN)为螯合剂,四氯化碳为萃取剂,丙酮为助溶剂,建立了析相微萃取-分光光度法测定化妆品中痕量铅的分析方法,并对影响络合反应和相分离的各种条件进行了优化。优化后的条件为:当水相体积为21.5 mL时,四氯化碳为2.0 mL,丙酮为1.5 mL,萃取时间为10 min。铅的质量浓度在0.20～13μg/mL范围内与吸光度呈线性关系,相关系数为0.999 81,方法的检出限为0.01μg/mL,对铅的质量浓度为1.0μg/mL的样品溶液进行7次平行测定,相对标准偏差为1.98%。该方法用于化妆品中铅的测定,回收率为96.4%～103.4%。A method for the determination of trace lead in cosmetics by spectrophotometry in combination with microsphere phase separation extraction was developed with 1 - （ 2 - pyridylazo） - 2 - naphthol （ PAN ） as chelating agent for Pb^2＋, carbon tetrachloride as extraction solvent and acetone as solubilizer. Various conditions that affect the complexing reaction and phase separation were optimized. When the volume of water is 21.5 mL,good extraction result can be obtained by using 2.0 mL carbon tetrachloride and 1.5 mL acetone with extraction time of 10 min. There was a linear relationship between absorbance and lead mass concentration in the range of 0. 20 - 13 μg/mL with the correlation coefficient of 0. 999 81. The detection limit of this method was 0. 01 μg/mL. The RSD was 1.98% for seven times of determination of a sample with lead content of 1.0 μg/mL. This method has been applied to the determination of lead in cosmetic samples with the recovery of 96.4% - 103.4%.

关 键 词：化妆品 析相微萃取 分光光度法 痕量铅 

分 类 号：TQ658[化学工程—精细化工]