Determination of Trace Lead in Environmental Samples by Flow Injection and Hydride Generation Atomic Absorption Spectrometry

摘要

A new method for the determination of lead is proposed using flow injection and hydride generation atomic absorption spectrometry (HG-AAS).For this studies,(NH4)2S2O8 is used as the oxidizing agent,100 mu L of sample and 100 mu L of 3.0 % (m/v) NaBH4 are simultaneously injected into two carrier streams,0.5 % (m/v) tartaric acid and deionized water,respectively.A sampling rate of about 150 determinations per hour was achieved,requiring 15 mL of NaBH4 and a waste generation of 250 mL.The detection limit of 0.3 mu g L~(-1) for Pb was achieved and the relative standard deviation of 2.1 % for 10 mu g L~(-1) Pb was obtained.The method was shown to be satisfactory for determination of traces of Pb in food,water and soil samples.