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

• Published in: Spectrochimica acta. Part B: Atomic spectroscopy 2005-06, Vol.60 (5), p.653-658
• Main Authors: Bispo, Márcia Sousa, Morte, Elane Santos da Boa, Korn, Maria das Graças Andrade, Teixeira, Leonardo Sena Gomes, Korn, Mauro, Costa, Antônio Celso Spínola
• Format: Article
• Language: English
• Subjects: Co-precipitation; Lead; Pre-concentration; Ultrasonic irradiation
• ISSN: 0584-8547; 1873-3565
• DOI: 10.1016/j.sab.2005.02.011

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 μg 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.