It' s oK, sir. Thank you.

The rest of the citation would include:

Fresenius' Journal of Analytical Chemistry, Volume 350, Numbers 10-11, 620-625, DOI: 10.1007/BF00323514

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Abstract

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 g L–1 of water and 7 g kg–1 of soil, for 75 s preconcentration time). Relative errors were lower than 3.7% and relative standard deviations smaller than 4.5%.