Determination of Pb in river water samples by inductively coupled plasma optical emission spectrometry after ultrasound-assisted co-precipitation with manganese dioxide

摘要

A simple and efficient procedure for separation and pre-concentration using ultrasound-assisted co-precipitation with manganese dioxide was developed for Pb determination by inductively coupled plasma optical emission spectrometry (ICP OES).The optimization process was carried out using a two-level factorial design and a Doehlert matrix.Three variables (i.e.concentration of oxidizing solution-KMnO_4,concentration of MnSO_4 solution and time of ultrasonic irradiation) were used as factors in the optimization.The recoveries,based on the analysis of spiked samples,were between 90% and 105%,and the precision was <5%.The detection limit and quantification limit for Pb determination were 3.2 and 10.7 ug L~(-1),respectively.The proposed method was applied for the determination of Pb in water samples from a river heavily polluted by industrial effluents.The recovery measured by analyte addition technique showed that the proposed pre-concentration method had good accuracy.