Abstract
The anodic stripping voltammetry (ASV) was investigated to determine total mercury in solid samples using a gold electrode. The mercury was deposited on the gold electrode in a preconcentration step. The oxidation peak of mercury was irreversible. The optimal conditions of the procedure were found to be as follows: 0.05 mol L−1 HCl solution, deposition potential −0.5 V vs. Ag/AgCl/KCls, deposition time 40 s, and sweep rate 0.04 V s−1. Under the optimal conditions, the peak current showed a linear dependence on Hg2+ concentration in the range from 0.01 to 0.1 mg l−1. The detection limit and quantification limit were 4.28 µg L−1 and 12.98 µg L−1, respectively. The mean recovery and relative standard deviation were 91.2% and 2.4% (n = 9). The procedure was successfully applied for determining total mercury in samples collected from Hanoi light bulb warehouse—The Rang Dong Light Source and Vacuum Flask JSC. The results were compared with cold vapor atomic absorption spectrometry (CV-AAS).
Highlights
Thuong Thi Kim Nguyen,1 Huyen Thu Luu,1 Loi Duc Vu,2 Thao Thi Ta,1 and Giang Thi Huong Le1
E anodic stripping voltammetry (ASV) was investigated to determine total mercury in solid samples using a gold electrode. e mercury was deposited on the gold electrode in a preconcentration step. e oxidation peak of mercury was irreversible. e optimal conditions of the procedure were found to be as follows: 0.05 mol L−1 HCl solution, deposition potential −0.5 V vs. Ag/ AgCl/KCls, deposition time 40 s, and sweep rate 0.04 V s−1
The peak current showed a linear dependence on Hg2+ concentration in the range from 0.01 to 0.1 mg l−1. e detection limit and quantification limit were 4.28 μg L−1 and 12.98 μg L−1, respectively. e mean recovery and relative standard deviation were 91.2% and 2.4% (n 9). e procedure was successfully applied for determining total mercury in samples collected from Hanoi light bulb warehouse— e Rang Dong Light Source and Vacuum Flask JSC. e results were compared with cold vapor atomic absorption spectrometry (CV-AAS)
Summary
Thuong Thi Kim Nguyen ,1 Huyen Thu Luu,1 Loi Duc Vu,2 Thao Thi Ta,1 and Giang Thi Huong Le1. E anodic stripping voltammetry (ASV) was investigated to determine total mercury in solid samples using a gold electrode. We proposed a new, low cost, high sensitivity and selectivity analytical method for the determination of mercury in the solid samples applying the anodic stripping voltammetry combining with the gold electrode as the working electrode.
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