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Reference type: Journal
Authors: Prasad BB, Arora B
Article Title: Imprinted polymer - Modified hanging mercury drop electrode for differential pulse adsorptive stripping voltammetric analysis of a diquat herbicide.
Publication date: 2003
Journal: Electroanalysis
Volume: 15
Issue: (2)
Page numbers: 108-114.
DOI: 10.1002/elan.200390010

Abstract: An imprinted polymer modified hanging mercury drop electrode (HMDE) in Model 303A system in conjunction with a PAR Model 264A Polarographic Analyzer/Stripping Voltammeter has been used for the selective analysis of a diquat herbicide viz., 5,6- dihydropyrazino[1,2,3,4-[1mn]-1,10-phenanthrolinium dichlorides in differential pulse cathodic stripping voltammetry mode. Complex aqueous samples (drinking water and agricultural soil suspension), spiked with a diquat herbicide, were directly analyzed by the adsorptive accumulation of the analyte over the working electrode (accumulation potential -0.8 V (vs. Ag/AgCl), accumulation time 120 s, pH 7.0, supporting electrolyte 0.1 M KCl, scan rate 10 mV s(-1), pulse amplitude 25 mV). The limit of detection for diquat herbicide was found to be 0.34 nmol L-1 (0.1 ppb, RSD 2% S/N = 2)


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