氢化物发生-原子荧光光谱法对土壤铅的测定研究

Determination of Trace Lead in Soils by Hydride Generation-Atomic Fluorescence Spectrometry

应用双道无色散原子荧光光谱仪，采用HNO3-HCIO4体系消解土壤样品，研究了光电管负高压、灯电流、载气和屏蔽气流量、硼氢化钾和铁氰化钾浓度对土壤铅测定结果的影响。在选定实验条件下，铅的线性范围为0～100μg·L^-1，检出限为0．04μg·L^-1，相对标准偏差为1．25％，加标回收率为93．8％-105．6％。测定表明该方法简便、快捷，测定结果准确可靠。

A double - channel and dispersionless atomic fluorescence spectroscopy has been developed for determination of trace lead in soils after digestion using HNO3 - HCIO4 system. The effect of the experimental conditions and instrumental operating parameters （ e. g. negative voltage, current of lampKBH4 concentration and K3 Fe （CN） 6 concentration, et al. ） on the determination of Pb is investigated. Under the optimum conditions,the linear range of determination is 0- 100 μg·L^-1, and the detection limit is 0.04 μg·L^-1. The instrumental relative standard deviation is 1.25% and the recovery is about 93.8% - 105.6%. This method is simple and rapid. The testing results are accurate and reliable.