Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560132 | Talanta | 2011 | 7 Pages |
Abstract
A differential pulse adsorptive stripping voltammetric method has been developed for molybdenum trace determination in environmental water samples containing organic compounds. It was proved that interferences from the organic matrix such as surface active substances and humic substances could be removed by the addition of resin to the analysed sample prior to voltammetric measurement. The parameters for Mo(VI) determination in the presence of resin, using a hanging mercury drop as the working electrode, were examined systematically for two complexing agents: cupferron and chloranilic acid. The detection limits estimated from 3 times the standard deviation for a low Mo(VI) concentrations were equal to 5 Ã 10â11 and 3 Ã 10â10 mol Lâ1 for cupferron and chloranilic acid, respectively. At the optimized conditions the quantitative Mo(VI) determination in the presence of even 50 mg Lâ1 of surface active compounds can be performed. The proposed procedures were validated in the course of Mo(VI) determination in certified reference material NASS-5 and in the course of studying recovery of Mo(VI) from spiked river water samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Malgorzata Grabarczyk, Anna Koper,