Preconcentration and voltammetric determination of palladium (II) at sodium humate modified carbon paste electrodes |
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Authors: | Qiaoyu Sun C. Wang Liangxi Li Hulin Li |
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Affiliation: | Department of Chemistry, Lanzhou University, Lanzhou 730000, P.R. China, CN
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Abstract: | A chemically modified carbon paste electrode was prepared by incorporating appropriate amounts of sodium humate(NaA). Palladium(II) was selectively accumulated in a solution of Britton-Robinson(B-R) buffer (pH 2.8) onto the electrode surface in open circuit mode. The subsequent electrochemical measurement was carried out by cyclic voltammetry (CV) and linear sweep anodic stripping voltammetry (LSASV) in a supporting electrolyte of 1.0 M HCl. The obtained oxidation currents (Ipa1 and Lpa2) were proportional to the Pd(II) concentration in the range of 4.7 × 10–6 - 9.4 × 10–8 M. The developed method was applied to the quantitative determination of palladium in real samples. |
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