The degradation of deltamethrin in vegetables

Date

3-1995

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Amelia W. Tejada

Abstract

ABSTRACT

MOOG, FRANCES ANNE P. University of the Philippines at Los Banos, March 1995. Degradation of Deltamethrin in Vegetables.

Adviser: Dr. Amelia W. Tejada

The degradation of deltamethrin, (s)-5-cyano-3- phenoxybenzyl-cis-(1R,3R)-2,2-dimethyl-3-(2,2-dibromo-vinyl) cyclopropanecarboxylate, in eggplant, pechay, tomato, and stringbeans was studied under field conditions. The degradation pattern of deltamethrin followed first-order kinetics with half-life of 2.2 days in eggplant and 1.2 to 1.7 days in pechay at the application rate of 0.20 kg a.i./ha for the recommended rate and 0.40 kg a.i./ha for twice the recommended rate. A pre-harvest interval of 5 days or more can be considered safe for consumption of these vegetables containing 0.30 to 0.50 mg/kg deltamethrin residues. This is within the acceptable daily intake (ADI = 0.01 mg/kg) for an average 60 kg man consuming 50 g vegetables per day. In stringbeans, deltamethrin residues were not detected after one day. This could be due to high solar radiation (521.3 cal/cm') at the time of spraying as compared to pechay with solar radiation of only 197.8 cal/cm'. In tomatoes, the residue was not detected even after 3 hours of spray application. This could be due to the effect of washing off by rain, with a rainfall of 10.5 mm, after application of deltamethrin.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1995 A13 M66

Document Type

Thesis

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