Dissipation kinetics and assessment of processing factor for chlorpyrifos and lambda-cyhalothrin in cardamom.
The dissipation kinetics and method for estimation of residues of chlorpyrifos and lambda-cyhalothrin in cardamom were studied and developed. The limit of detection and limit of quantitation arrived for the compounds were 0.01 and 0.025 μg g(-1), respectively. Gas chromatographic response of chlorpyrifos and lambda-cyhalothrin residues was linear in the range of 0.01-0.50 μg g(-1) and the mean recovery obtained was 97.3 % for chlorpyrifos and 98.9 % for lambda-cyhalothrin with satisfactory relative standard deviation values. The mean initial residues of chlorpyrifos applied at a concentration of 0.05 % in cardamom was 2.5 μg g(-1) and the residue was 8.1 μg g(-1) after processing, with a processing factor of 3.24, while lambda-cyhalothrin when applied at 0.0025 % resulted in initial residues of 1.63 μg g(-1) that magnified to 4.86 μg g(-1) on curing, with a processing factor of 2.98. The half-life of chlorpyrifos was in the range of 5.1-5.24 days while that of lambda-cyhalothrin was in the range of 4.40-4.55 days. The processing factor arrived at in the above experiment lead to the conclusion that the residues of chlorpyrifos got magnified to 3.24-3.68 times and that of lambda-cyhalothrin got magnified to 2.98-3.46 times of initial residues, consequent to loss of weight due to dehydration during curing.
AINP on Pesticide Residues, College of Agriculture, Kerala Agricultural University, Vellayani PO, Trivandrum 695 522, India. thomasgeorgetvm@yahoo.co.uk
Thomas
T
George
S Naseema
SN
Beevi
George
G
Xavier
N Pratheesh
NP
Kumar
Jayesh
J
George
D004390:Chlorpyrifos / Q000032:analysis* / Q000737:chemistry; D028523:Elettaria / Q000737:chemistry*; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry; D006207:Half-Life; D007306:Insecticides / Q000032:analysis* / Q000737:chemistry; D007700:Kinetics; D009570:Nitriles / Q000032:analysis* / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry; D011722:Pyrethrins / Q000032:analysis* / Q000737:chemistry; D018570:Risk Assessment
D004785:Environmental Pollutants; D007306:Insecticides; D009570:Nitriles; D010573:Pesticide Residues; D011722:Pyrethrins; D004390:Chlorpyrifos; C037304:cyhalothrin