Characteristics of Pyrethroid Pesticide Residues in Soil of Shenyang, China

Pyrethroid residues in the surface soils and among different soil layers of the open fields and greenhouse soils of Shenyang, China, were analyzed. In addition, the relationship between the soil properties and the pesticide residues was also assessed. Results showed that the detection rates of the pyrethroids were high and multiple pyrethroid pesticides were detected and the average level of trans-cypermethrin was 73.05 μg/kg, which was the highest among the concentration of all test pyrethroids. The detection rate and the residual amount of the same pyrethroid residues were at the low levels in different regions around Shenyang. Comparing the pyrethroid concentrations in greenhouse and the open fields, the residues in greenhouse were higher than those in the open fields. In different soil layers, the pesticide residues were found mainly in the 0-20cm soil layer, and there were no significant differences among the soil depths of 20 cm, 40 cm, 60 cm, 80 cm and 100 cm. Statistical analysis results showed that the residues of fenvalerate were more with the increase of pH value. Organic matter contents were positively correlated with the residues of α-cypermethrin and cypermethrin, and negatively correlated with the residues of lambdacyhalothrin.