14Pesticide residues were determined in about 120 soil cores taken randomly from the top 15 15 cm layer of two sunflower fields about 30 days after pre-emergence herbicide treatments.
16Samples were extracted with acetone-ethyl acetate mixture and the residues were determined 17 with GC-TSD. Residues of dimethenamid, pendimethalin and prometryn ranged from 0.005 18 mg/kg to 2.97 mg/kg. Their relative standard deviations (CV) were between 0.66 and 1.13.
19The relative frequency distributions of residues in soil cores were very similar to those 20 observed in root and tuber vegetables grown in pesticide treated soils. Based on all available 21 information, a typical CV of 1.00 was estimated for pesticide residues in primary soil samples
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