Multi-residue analysis and risk assessment of frequently applied pesticides on bitter gourd (Momordica charantia L.) and eggplant (Solanum melongena esculentum)

Date

10-2002

Degree

Bachelor of Science in Agricultural Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Cristina M. Bajet

Abstract

SOLITARIO, RHEA D. University of the Philippines Los Banos, October, 2002. Multi-Residue Analysis and Risk Assessment of Frequently Applied Pesticide on Bitter Gourd (Momordica charantia L.) and Eggplant (Solanunt melongena esculentunt).

Adviser: Prof. Cristina Madamba-Bajet

Members: Dr. Leonila M. Varca

Dr. Nieva T. Librojo-Basilio

Studies were conducted on the analysis and risk assessment of the residues of frequently applied pesticides on bitter gourd (Momordica chummier L.) and eggplant (Solanum melongena esculenium) in Region IV.

A survey of the current pesticide management practices of bitter gourd and eggplant farmers in Region IV was done which identified the following as the frequently applied pesticides on bitter gourd and eggplant in decreasing order: profenofos, malathion and chlorpyrifos (organophosphates); carbaryl (carbamate); and, deltamethrin, l-cyhalothrin and cypermethrin (pyrethroids). The study focused on the analysis of these pesticides on samples collected from farmer's fields.

Method validation was done at 0.5 ug/g spiking level using a modified extraction method from PAM (Pesticide Analytical Manual), cleanup using deactivated Florisil and analysis by Gas Chromatography. Recoveries for carbaryl, chlorpyrifos, malathion and profenofos were 92.7%, 95.7%, 89.6% and 82.0% for hitter gourd and 83.7%, 99.4%, 92.8% and 54.2% for eggplant, respectively.Recoveries for 1-cyhalothrin, deltamethrin, cypermethrin and fenvalerate were 92.1%, 91.7%, 81.8% and 92.7% for bitter gourd and 84.4% and 83.6% for eggplant, respectively.

Four bitter gourd samples collected from Sariaya, Quezon applied with chlorpyrifos+BPMC, 1-cyhalothrin and deltamethrin (5-7 days pre-harvest interval or PHI) showed residues of chlorpyrifos, 1-cyhalothrin, deltamethrin and fenvalerate (1.5-995.6 ng/g). From Lilies, Laguna, four samples sprayed with chlorpyrifos+Bl'MC, malathion with carbaryl, cypermethrin and 1-cyhalothrin (5-7 days Pill) showed residues of chlorpyrifos, 1-eyhalothrin, cypermethrin and fenvalerate (3.1-187.6 ng/g). Residues of chlorpyrifos, 1-cyhalothrin and deltamethrin ranging from 1.3-11.2 ng/g were detected from four eggplant samples from Balete, Batangas sprayed with malathion, deltamethrin and 1-cyhalothrin (4 days-3 weeks PHI). No residues of the applied carbaryl (2-3 weeks PHI) were detected in 2 samples from Calatnba, Laguna but trace residues of chlorpyrilbs,l-cyludothrin and deltamethrin (1.3-2.5 ng/g) were detected.

The bitter gourd sample from Sariaya, Quezon exceeded the 0.2 mg/kg Codex MRL (Maximum Residues Limits) but was below risk level (21.3% of the acceptable daily intake or ADO. The same assessment was made with the sample from Lilies, Laguna near the Codex MRL value. Assessment however showed that the residues were below the ADI values, for all pesticide residues detected, whether the pesticide was used as last spray or as residues of previous spray applications.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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