示波极谱直接测定人发中的铅

Direct Determination of Lead in Human Hair with Oscillopolarograph

在０．１０ｍｏｌ·Ｌ￣（－１）盐酸－０．４０ｍｏｌ·Ｌ￣（－１）六次甲基四胺－５．０×１０￣（－３）ｍｏｌ·Ｌ￣（－１）邻菲啉－５．０×１０￣（－３）ｍｏｌ·Ｌ￣（－１）硫氰酸钾底液中用示波极谱法测定铅的方法，峰电位为－０．７０Ｖ（ＶＳ，ＳＣＥ）左右，线性范因为０．０４－１．６μｇ·ｍｌ￣（－１），检出限为０．００８μｇ·ｍｌ￣（－１）。该方法简便、快速、选择性好，直接应用于人发中铅的测定；变异系数为２．４－５．９％；样品加标回收率为９７．４－１０５％。

n this stady,a method for the determination of lead in a supporting solution of 0.10mol·L￣(-1) hydrochloric acid,0.40mol·L￣(-1) hexamethylenc teramine,5.0×10￣(-3)mol·L￣ (-1) ophenan-throlene and5.0×10￣(-3)mol·L￣(-1) potassium thiocyanate by oscillopolarograph has been estab-lished.The peak potential of lead is-0.70V(vs. SCE)or so.Linear relationship is shownbetween the peak height and concentration in range of 0.04～ 1.6ug·ml￣(-1) for lead.The de-tection limit is 0.008ug·ml￣(-1). This method is simple,rapid and has good selectivity.Thismethod can be used for direct determination of lead in human hair sarnple,the coefficient ofvariation is 2.4～5.9%,the added recoverv is 97.4～ 105%.