Electrochemical determination of carbaryl oxidation in natural water and soil samples
1994
Perez-Lopez, J.A. (Autonoma Univ., Madrid (Spain). Dept. of Analytical Chemistry and Instrumental Analysis) | Zapardiel, A. | Bermejo, E. | Arauzo, E. | Hernandez, L.
An electrochemical method for the determination of carbaryl, after prior oxidation to 1,4-naphthoquinone in natural water and soils is reported. The coulometric oxidation of carbaryl at a platinum electrode was studied using 0.024 mol/L Britton-Robinson buffer (pH 7.0). The reduction of the oxidation product 1,4-naphthoquinone at a dropping mercury electrode was used for the indirect determination of carbaryl after separation on C18 Sep-pak cartridges by differential pulse polarography (detection limits: 0.41 mg L (-1) of water and 0.47 mg kg (-1) of soil) and directly without separation by adsorptive stripping voltammetry (detection limits: 5 mig L (-1) of water and 7 mig kg (-1) of soil, for 75 s preconcentration time). Relative errors were lower than 3.7 % and relative standard deviations smaller than 4.5 %
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