title: Persistence and effect of processing on chlorpyriphos residues in tomato (Lycopersicon esculantum Mill.).
abstract: Persistence of chlorpyriphos in tomato was studied following applications of Action 505EC at 800 and 1600 g ha(-1) with active application of chlorpyriphos as 400 and 800 g a.i. ha(-1). The average initial deposits of chlorpyriphos were 0.155 and 0.372 mg kg(-1) on tomato fruits on application of ready-mix formulation, Action 505EC at single and double dose, respectively. The residues dissipated with half- life period of 4.43 days at single dose and 4.38 days at double dose following pseudo first order kinetics.Residues of chlorpyriphos in both the doses on 0 day were below maximum residue limit (MRL) of 0.5 mg kg(-1). Processing was found very effective in reducing the residues of chlorpyriphos in tomato fruits. By washing, reduction of chlorpyriphos was in the range of 41-44 per cent. Washing followed by boiling reduced the residues from 89 to 91% whereas peeling removed residues from 62 to 64%. In soil samples, residues of chlorpyriphos reached below detectable level of 0.010 mg kg(-1) after 5 and 10 days after spray at single and double dose, respectively.
authors.affiliation: Department of Chemistry & Physics, CCS Haryana Agricultural University, Hisar, India.
authors.forename: Mamta
authors.initials: M
authors.lastname: Rani
authors.forename: Sunayana
authors.initials: S
authors.lastname: Saini
authors.forename: Beena
authors.initials: B
authors.lastname: Kumari
mesh_terms: D004390:Chlorpyrifos / Q000378:metabolism*; D005506:Food Contamination; D005511:Food Handling; D005638:Fruit / Q000378:metabolism; D006207:Half-Life; D007306:Insecticides / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000378:metabolism*; D010573:Pesticide Residues / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000032:analysis; D032322:Solanum
chemical_list: D007306:Insecticides; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; D004390:Chlorpyrifos
keywords: Chlorpyriphos; Half-life period; Processing; Soil; Tomato