期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1007, 期 1-2, 页码 85-91出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(03)00953-1
关键词
soil; sonication-assisted extraction; extraction methods; environmental analysis; carbamates; pesticides
A rapid multiresidue method has been developed for the analysis of carbamate insecticides (oxamyl, methomyl, propoxur, carbofuran, carbaryl and methiocarb) in soil. The method is based on the sonication-assisted extraction of soil samples placed in small columns using a low volume of methanol. Residue levels in soil were determined by reversed-phase high-performance liquid chromatography with fluorescence detection after post-column derivatisation. The separation of carbamates is performed on a C-8 column with water-methanol as mobile phase. Recovery studies were carried out at 0.5, 0.1 and 0.01 mug/g fortification levels and average recoveries obtained for carbamates ranged from 82 to 99% with relative standard deviations between 0.4 and 10%. The effect of residue residence time and soil moisture content on the insecticide recovery was also studied. The method is linear over the range assayed, from 0.1 to I mug/ml. The detection limit for the carbamates varied from 1.6 to 3.7 mug/kg and the quantification limit obtained was 10 mug/kg. The emission and excitation spectra allowed the confirmation of residues at levels around 0.1 mug/g. (C) 2003 Elsevier B.V. All rights reserved.
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