| Autor: |
Westenbrink, W. W., Page, J. A., VanLoon, G. W. |
| Zdroj: |
Canadian Journal of Chemistry; February 1990, Vol. 68 Issue: 2 p209-213, 5p |
| Abstrakt: |
Conditions for the determination of trace Co in seawater are described. The method involves formation of the dimethylglyoxime complex and adsorptive accumulation onto a hanging mercury drop electrode at an applied potential of −0.70 or −0.96 V vs. SCE. The adsorbed complex is then reduced by scanning the electrode potential to −1.20 V; the reduction peak potential (Ep) is −1.12 V. Nickel behaves in a similar manner with Epof −0.99 V but the Co complex appears to be preferentially adsorbed, making analysis for Co possible even in the presence of a large excess of Ni. Adsorption of organic matter also occurs; this does not affect analytical sensitivity but limits the maximum deposition time allowed in the analysis.Determination of Co in six seawater samples yielded results ranging from 4 to 114 ng L−1. Good agreement was obtained with the one reference sample (NASS-1) for which there was a certificate value. Keywords: cobalt, dimethylglyoxime, stripping voltammetry, adsorption, seawater. |
| Databáze: |
Supplemental Index |
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