Supervised pesticide residue trial of cyfluthrin in eggplant (Solanum melongena esculentum)

Date

4-2002

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cristina M. Bajet

Abstract

The rate of decline of cyfluthrin, (RS)-cyano(4-fluoro-3-phenoxyphenyl)methy1- 342.2-dichloroetheny1)-2,2-dimethylcyclopropane carboxylate, in eggplant (Solanum melangena c.vc.ulemum) was studied under field conditions. Pesticide application rates were 15 mIJ16 L (0.75 g active ingredient. a ilha) and 32 mI.J16 L (1 50 g a i./ha) for the recommended rate (RR) and double recommended rate (2RR) at 7 days interval for 5 treatment applications, respectively. However, using the farmers practice rate (FP), the dosage rate followed the recommended rate at 15m1/ 16L (0.75 g a i/ha) with 3 days interval for 10 treatment applications. Cytluthrin residues were extracted with acetone, partitioned with methylene chloride, cleaned-up in a column with 15% diethyl ether/petroleum ether. Samples were taken after 0, 1, 3, 5, 7 and 14 days (DAS) using different pesticide management practices (FP, RR and 2RR). The recovery of cvfluthrin residues using the method was 81 03% The degradation/loss pattern of cyfluthrin obeyed first order kinetics with half-lift (t1 2) of 5 16, 2.79 and 2 89 days for FP, RR and 2RR, respectively, with corresponding degradation rate constant, k, of 0.134, 0.249 and 0.240/day. A pre-harvest interval (P111) of 5-7 days can be considered safe for human consumption containing 0.038 to 0.140 mg/kg cyfluthrin residues. The recommendation was based on the acceptable daily intake (ADD) of 0.02 mg/kg for an average 50 kg body weight consuming 106 g of vegetable per day. The comparative decline of cyfluthrin at IP and RR were not significantly different at 0, 1, 3, 5, 7 and 14 DAS. However, the decline pattern applied between FP and 2RR, and RR and 2RR were significantly different at 5-7 DAS at 5% level of confidence.

Language

Filipino

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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