双波长分光光度法测定废水痕量铅

Dual- wavelength Spectrophotometric Determination of Trace Amounts of Lead with Fe- TBA Complex

在 pH2.3柠檬酸盐缓冲溶液中，铅与 Fe(Ⅲ )－ TBA产生络合形成蓝紫色显色液。在此显色反应基础上，根据光谱修正光度理论，研究了该络合物不稳定系数及废水中微量铅测定方法。其相对标准偏差 RSD≤ 4.1％，加标回收率 92.0％～ 106％，铅的最低检测浓度为 0.015mg／ L。

Lead(II) can replace Fe(III) in its TBA chelate at pH2.3.In this paper,the determination of trace lead has been completed by theβ－ correction spectrophotometry.This method is completely eliminate the effect of the excess Fe－ TBA from its coloured solution to improve the linearity of the absorbance with Pb(II) concentration (X).The results showed that the recovery of lead was between 92.0％～ 106％ ,with the RSD of less than 2.3％ .