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Title: 1-(2-Pyridylazo)-2-naphthol modified carbon paste electrode for trace cobalt(II) determination by differential pulse cathodic voltammetry
Authors: Khan, M.R.
Khoo, S.B. 
Keywords: Biological materials
Differential pulse cathodic voltammetry
Modified carbon paste electrode
Issue Date: 1998
Citation: Khan, M.R., Khoo, S.B. (1998). 1-(2-Pyridylazo)-2-naphthol modified carbon paste electrode for trace cobalt(II) determination by differential pulse cathodic voltammetry. Analyst 123 (6) : 1351-1357. ScholarBank@NUS Repository.
Abstract: A differential pulse cathodic voltammetric method was developed for the sensitive and selective determination of Co(II) at a l-(2-pyridylazo)-2-naphthol modified carbon paste electrode. The analysis procedure consisted of an open circuit accumulation step in stirred sample solution. This was followed by medium exchange to a 'clean' solution where the accumulated Co(II) was oxidized and subsequently a cathodic potential scan was effected to obtain the voltammetric peak. The precisions obtained for 10 successive determinations each of 1.00 x 10-6 mol l-1, 1.00 x 10-7 mol l-1 and 1.00 x 10-8 mol l-1 Co(II) were 2.80, 5.14 and 9.67% (relative standard deviations), respectively. The detection limit was estimated to be 5.9 x 10-9 (0.35 ppb) (S/N = 3), for 180 s accumulation. Of the 35 selected substances examined for interferences, only V(II), Ce(III), EDTA and Triton X-100 interfered. These interferences could be easily eliminated. The developed method was tested using a certified sample (USEPA WP 386) and then applied to the determination of Co(II) in human hair, pig liver and spinach samples.
Source Title: Analyst
ISSN: 00032654
DOI: 10.1039/a707375e
Appears in Collections:Staff Publications

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