Terminal residues of propaquizafop in cotton seed, lint and soil

摘要

A supervised field trial was conducted in order to assess the terminal residues of herbicide propaquizafop in cotton lint, seed and soil. Propaquizafop formulation 10 EC was applied @ 62.5 and 125 g/ha on 45 days after sowing (DAS). Seed, lint and soil samples were collected at harvest time and processed for residues extraction. After clean up, the residues were estimated using gas chromatography tandem mass spectrometry (GC-MS/MS) by developing a new multiple reaction monitoring programme (MRM). Method validation was achieved by performing recovery experiments at two fortification levels of 0.003 and 0.005 ig/g. The average recoveries obtained from cotton lint, seed and soil samples were above 85 per cent. The limit of detection and limit of quantification (LOD and LOQ) were found to be 0.001 and 0.003 ig/g, respectively. It was observed that residues of propaquizafop in cotton seed and lint were below detectable level of 0.003 ig/g. In soil, 0.005 and 0.007 ig/g of propaquizafop residues were observed at single and double dose applications, respectively.