Sensitive adsorptive stripping voltammetric method for direct determination of trace concentration of lead in the presence of cupferron in natural water samples |
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Authors: | Malgorzata Grabarczyk |
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Affiliation: | 1. Faculty of Chemistry , Maria Curie-Sklodowska University , 20-031 Lublin , Poland mgrabarc@poczta.umcs.lublin.pl |
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Abstract: | This paper reports the use of an adsorptive voltammetric technique for Pb(II) determination using cupferron as a selective complexing agent. After accumulation of the complex onto a hanging mercury drop electrode, the electrode potential was scanned with differential pulse modulation and the reduction current of lead was observed at about??0.5?V. Under optimum conditions (5?×?10?4?mol?L?1 cupferron concentration, 0.1?mol?L?1 acetate buffer (pH 5.5), adsorption at??50?mV for 30?s) the detection limit was 5.1?×?10?10?mol?L?1. The relative standard deviation of five measurements for low lead concentration was 3.1%. The accuracy of the method was tested by analysing certified reference material (SPS-WW1 Waste Water). Finally, the method was successfully applied to the determination of Pb(II) in river water samples without any pretreatments. |
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Keywords: | lead (II) determination adsorptive stripping voltammetry cupferron river waters |
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