Study on Anodic Stripping Voltammetry of Trace Lead at Oxalic Acid Modified Electrode

Abstract

Abstract: In this paper, the preparation of oxalic acid modified electrode, reaction mechanism and electrochemical characteristics of trace lead on the electrode arereported. The Si(CH₂)₃NHCCOH group was covalently bonded to glass carbonelectrode surface through chemical reaction. The group could form stable complex with lead in solution and increase the deposition amount of lead on the electrode surface with electrochemical reaction. The behavior of the lead at electrode was investigated by anodic stripping voltammetry in following conditions: 15ng/mL of lead in HAc-NaAc system was preconcentrated at a controlled potential of -0.90 V(vs,SCE) for 2 min, then followed by scanning till -0.10 V(vs, SCE). The anodic stripping voltammograms showed an increase of current at about -0.54V (vs,SCE). Its sensitivity was 7.5 times highter than that of normal glass carbon electrode. The peak height is linearly related to the concentration of lead in the range of 1.0-15.0ng/mL. The relative standard deviation for twelve parallel determinations is 3%. The lead in urine was determined by oxalic acid modified electrode with satisfactory results.

Key words: Modified electrode, Anodic stripping voltammetry, Determination of trace lead

TrendMD:

Fang Yuzhi, Bai Zhuping, Jin Litong . Study on Anodic Stripping Voltammetry of Trace Lead at Oxalic Acid Modified Electrode[J]. Chem. J. Chinese Universities, 1989, 10(1): 30.

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Study on Anodic Stripping Voltammetry of Trace Lead at Oxalic Acid Modified Electrode

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