Add time:07/17/2019         Source:sciencedirect.com

Differential pulse anodic stripping voltammetry was used for trace determination of Picoxystrobin (cas 117428-22-5) in urine and water samples. Experimental conditions have been optimized and the measurement cycle started with the application of a deposition potential at −700 mV, during 60 s, for the in situ formation of the Bi film on a glassy carbon substrate and the accumulation of the analyte. It has been proven that, in the conditions employed, a significant amount of Bi is still present as a film on the surface electrode when the anodic scan is performed from +790 to +1050 mV at a rate of 40 mV s−1 and that the presence of Bi is fundamental for the accumulation and oxidation of picoxystrobin during re-dissolution (peak maximum at +954 mV). The supporting electrolyte was HCl 1 mol L−1 and a cleaning procedure was developed in order to minimize memory effects. Linear and homoscedastic analytical responses (r2 > 0.99) have been observed with limit of quantification of 100 μg kg−1. Solid phase extraction (on a C-18 cartridge) allows the pre-concentration of the analyte and eliminates interferences from urine samples. Recoveries from 89.3 to 104.8% were found and interferences from azoxystrobin, dimoxistrobin, fluxastrobin, kresoxi-methyl and pyraclostrobin were evaluated.

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