Hazard assessment of pesticides detected in the Pagsanjan-Lumban watershed

Creator

Cristina M. Bajet, University of the Philippines Los Banos
Maria Fe N. Calingacion, University of the Philippines Los Banos
Anupama Kumar, University of the Philippines Los Banos
Jacob Barbosa, University of the Philippines Los Banos
Teresita C. Narvacan, University of the Philippines Los Banos

Issue Date

10-2011

Abstract

Laguna Lake is the largest island water resource in the Philippines and important source of fish in the area. The Pagsanjan-Lumban watershed is the main fresh water input of the lake but contaminant resulting from agricultural activities within the watershed may have impact on fish. An acute hazard assessment was conducted by comparing the LC₅₀ values of pesticides to freshwater shrimp. Macrobacterium or Tilapia sp. and Lemna minor and actual concentrations of the pesticides detected in selected sampling areas within the Pagsanjan-Lumban watershed. The maximum measured concentartion of profenofos and pyrethroids in the field samples collected from the Pagsanjan-Lumban watershed were above the 48th LC₅₀ values and thus posing a high hazard coefficient (HQ>1) to shrimp in the Pagsanjan-Lumban watershed. Low actual risk estimate was obtained for Lemna sp. based on concentrations of six pesticides detected in the watershed.

Source or Periodical Title

Philippine Entomologist

ISSN

0048-3753

Volume

25

Issue

2

Page

209

Document Type

Article

Frequency

semi-annually

Language

English

Recommended Citation

Bajet, Cristina M.; Calingacion, Maria Fe N.; Kumar, Anupama; Barbosa, Jacob; and Narvacan, Teresita C., "Hazard assessment of pesticides detected in the Pagsanjan-Lumban watershed" (2011). Journal Article. 5238.
https://www.ukdr.uplb.edu.ph/journal-articles/5238

En – AGROVOC descriptors

WATERSHEDS; WATER POLLUTION; POLLUTION DETECTION; WATER ANALYSIS; PESTICIDES; HAZARDS; PHILIPPINES