The dissipation kinetics of malathion in aqueous extracts of different fruits and vegetables.
The dissipation of malathion in 5% aqueous extracts of some fruits and vegetables including bell pepper, tomato, cucumber, cantaloupe, carrot, and also buffer (control) was investigated at 37 °C for 4 h. The dissipation trend of malathion in the fruit/vegetable samples and buffer followed first-order double-exponential decay (FODED) and simple first-order kinetic (SFOK) models, respectively. The initial dissipation rate of malathion in tomato (DT10=0.05 h), bell pepper (DT10=0.06 h), and carrot (DT10=0.07 h) was faster compared to the other samples. The slowest rate of pesticide decline belonged to cantaloupe (DT50=1.92 h) with a significant difference from the other samples (p≤0.01), whereas tomato (DT50=0.43 h) and carrot (DT50=0.53 h) showed the fastest dissipation rate. DT90 values derived from the models revealed no significant difference between the samples except for cantaloupe which had the slowest rate of dissipation (DT90=8.27 h) with a significant difference compared to others (p≤0.01). A direct correlation was observed between protein content of the samples and the rate of malathion decline which indicates the role of plant enzymes in degrading malathion residues.
Department of Plant Protection, University College of Agriculture and Natural Resources, Karaj, Iran.
Shahrzad
S
Rahimi
Department of Plant Protection, University College of Agriculture and Natural Resources, Karaj, Iran. khtalebi@ut.ac.ir.|Department of Plant Protection, University of Tehran, Karaj, Iran. khtalebi@ut.ac.ir.
Khalil
K
Talebi
Department of Plant Protection, University College of Agriculture and Natural Resources, Karaj, Iran.
Ehssan
E
Torabi
Department of Plant Protection, University College of Agriculture and Natural Resources, Karaj, Iran.
Vahid Hoseini
VH
Naveh
D018553:Cucumis sativus; D004784:Environmental Monitoring; D005638:Fruit / Q000737:chemistry*; D007700:Kinetics; D008294:Malathion / Q000032:analysis / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis / Q000737:chemistry*; D014675:Vegetables / Q000737:chemistry*; D014867:Water
D010575:Pesticides; D014867:Water; D008294:Malathion
Degradation times; Dissipation kinetics; First-order double-exponential decay model; Malathion; Simple first-order kinetic model