ISSN:
1040-0397
Keywords:
Cobalt
;
Adsorptive stripping voltammetry
;
Nitroso-naphthol
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Cobalt (II)/1-nitroso-2-naphthol chelate in citrate/ammonium citrate (pH 8.6) buffer solution is studied by adsorptive stripping voltammetry on a static mercury drop electrode (SMDE). The adsorbed chelate yields one distinct peak at -0.51 V, which can be utilized to quantify trace cobalt. The interfacial and redox behavior are evaluated by cyclic voltammetry and pulse polarography. The effect of accumulation potential, accumulation time, and concentration of ligand on the reduction peak currents of the chelate have been discussed. Possible interference metal ions are also investigated. The peak current is proportional to the concentration of cobalt in the range of 10-7 to 10-9 M (correlation coefficient 0.998). The relative standard deviation is 2.6% at the concentration of Co(II) 2.2 × 10-8 M (n = 7). The detection limit of Co(II) is as low as 0.05 ppb (2-minute accumulation).
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140050716
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