^(141)Ce示踪研究毛发稀土分析中所用的洗发方法

^(141)Ce as a tracer to find the efficient washing method for hair in the analysis of rare earth elements

毛发是常用的生物监测材料,排除外源性污染是毛发中微量元素分析的主要问题之一。各种洗涤方法在去除外源性污染的同时,亦可能造成内源性元素的丢失。影响洗涤效果的主要因素有洗涤时间、洗涤液浓度、温度、体积和pH等。通过洗发方法的^(141)Ce示踪研究发现用0.1mol/1 EDTA(50℃,洗涤10min)是发样稀土分析中值得推荐的洗发方法。

Various procedures were compared in relation to the removal of 141Ce exogenously contaminated as well as endogenously incorporated in hair. Extraction efficiency of cerium with hot EDTA was the greatest among the four washing procedures. However, no procedure can effectively remove all exogenous cerium without reducing the endogenous cerium.Among the four procedures evaluated, washing with 0.1mol/1 EDTA (50℃, 10 minutes) is recommended before the analysis of rare earth elements in hair because of its efficiency in removing exogenous cerium and causing less loss on endogenous cerium.