Development and Validation of QuEChERS Method for Estimation of Propamocarb Residues in Tomato (Lycopersicon esculentum Mill) and Soil

An easy, simple and efficient analytical method was standardized and validated for the estimation of residues of propamocarb in tomato and soil. QuEChERS method included extraction of the sample with ethyl acetate and cleanup by treatment with PSA and graphatised carbon. Final clear extracts of ethyl acetate were concentrated under vacuum to almost dryness and reconstituted into hexane. The residues of propamocarbwere estimated using gas chromatograph-mass spectrometry (GC-MS). Propamocarb presented a distinct peak at retention time of 8.962 min. Consistent recoveries of propamocarb ranging from 87 to 92 percent were observed when samples were spiked at 0.10, 0.50 and 1.00 mg·kg levels. The limit of quantification (LOQ) of this method was determined to be 0.10 mg·kg.