Determination of metribuzin and major conversion products in soils by microwave-assisted water extraction followed by liquid chromatographic analysis of extracts.
A multiresidue method developed for the analysis of metribuzin and its major conversion products, deaminometribuzin (DA), diketometribuzin (DK) and deaminodiketometribuzin (DADK), in soils is presented. The method is based on microwave-assisted water extraction (MAWE) of soils using 10 mM phosphate buffer, pH 7 as extractant and analysis of aqueous extracts by HPLC-diode array detection. MAWE operational parameters were optimized with respect to extraction efficiency of the target compounds from soils with 1.5 and 3.5% organic matter content. Recoveries of all solutes above 80% were obtained from soils with 1.5% organic matter content; respective LOD and LOQ levels were determined at 5 and 10 micrograms/kg. In soils with organic matter content 3.5%, recoveries of all solutes were lower (< 70%) and the respective LOD and LOQ values were determined at 10 and 50 micrograms/kg. However, recoveries of fresh and aged residues, the latter weathered under cold storage conditions, were not statistically different for both types of soils.
Pesticide Science Laboratory, Aristotle University, P.O. Box 1678, 54006 Thessaloniki, Greece.
Emmanuil N
EN
Papadakis
Euphemia
E
Papadopoulou-Mourkidou
D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis*; D014227:Triazines / Q000032:analysis*
D006540:Herbicides; D012989:Soil Pollutants; D014227:Triazines; C009235:metribuzin