M. Kotoucek et M. Opravilova, VOLTAMMETRIC BEHAVIOR OF SOME NITROPESTICIDES AT THE MERCURY DROP ELECTRODE, Analytica chimica acta, 329(1-2), 1996, pp. 73-81
Classical DC-polarography and fast scan differential pulse voltammetry
(FSDPV) were applied to study the reduction mechanism of five nitrope
sticides (trifluralin, benfluralin, pendimethalin, bromofenoxim, fluor
oglycofen-ethyl) at a dropping mercury electrode (DME) and at a static
mercury drop electrode (SMDE) in a medium of 47-49% (v/v) alcohol or
10-20% (v/v) dimethylformamide. The nitro groups were reduced to hydro
xylamine derivatives or further to the corresponding amines depending
on the type of compound and of solution acidity. The determination of
nitropesticides was performed using FSDPV and adsorptive stripping vol
tammetry (AdSV) in model samples. The relative standard deviations wer
e smaller than 4.5% for concentrations higher than 2 ng/ml. The detect
ion limits were found both experimentally and calculated from regressi
on analyses. According to the experimental conditions their values wer
e in the range 17-160 ng/ml or 0.1-2.8 ng/ml for FSDPV or AdSV, respec
tively. The nitropesticides in artificially contaminated soils were de
termined after two to three times extraction with acetone. The recover
y was about 96%.