Collect. Czech. Chem. Commun. 2009, 74, 599-610
Published online 2009-03-30 10:36:15

Determination of trace amounts of lead by adsorptive cathodic stripping voltammetry with L-3-(3,4-Dihydroxyphenyl)alanine

Mohammad Bagher Gholivand*, Alireza Pourhossein and Mohsen Shahlaei

Chemistry Department, Faculty of Sciences, Razi University, Kermanshah, Iran


A sensitive and selective procedure is presented for the voltammetric determination of lead. The procedure involves an adsorptive accumulation of lead L-3-(3,4-dihydroxyphenyl)alanine (LDOPA) on a hanging mercury drop electrode, followed by a stripping voltammetric measurement of reduction current of an adsorbed complex at –0.15 V (vs Ag|AgCl). Optimum conditions for lead analysis include pH 8.5, 80 μM LDOPA and accumulation potential –0.15 V (vs Ag|AgCl). The peak currents are proportional to the lead concentration 1–300 nmol l–1 with a detection limit of 0.6 nmol l–1 and accumulation time 60 s. The method was used for the determination of lead in blood, dry tea and also in waters.

Keywords: Adsorptive stripping voltammetry; Lead; Levodopa; Amino acids; Pollutants determination; Waste water.

References: 31 live references.