Determination of organochlorine and organophosphate pesticide residues in water from the rivers of Davao City by gas chromatographic-mass spectrometric analysis

College

College of Science

Department/Unit

Chemistry

Document Type

Archival Material/Manuscript

Publication Date

2012

Abstract

Organochlorine and organophosphate pesticides comprise a large group of structural diverse compounds used in the control of agricultural pests. Four major rivers were sampled to evaluate the levels of organochlorine and organophosphate pesticide residues namely: eight (8) sampling stations along Talomo River, four (4) sampling stations along Lipadas River, five (5) sampling stations along Tagluno River, and eight (8) sampling stations in Panigan-Tamugan Rivers. Water samples were extracted by liquid-liquid extraction and analyzed using a gas chromatograph coupled with mass spectrometer detector. A total of ten (10) pesticide residues were identified, and five (5) of the ten are classified banned by the Fertilizers and Pesticides Authority of the Department of Agriculture of the Philippines. The banned pesticides detected in the samples were dieldrin, aldrin, endrin aldehyde, y-chlordane, and B-heptachlorepoxide. The other pesticides identified were penthoate, malathion E50, chlorothalonil, chlorpyrifos, and dichlorodiphenyldichloroethylene (DDE). Concentrations of some detected organochlorine and organophosphate pesticides in water were relatively higher as compared to guideline values set by United States Environmental Protection Agency (US EPA) and by the International Union of Pure and Applied Chemistry (IUPAC) and thus present a threat to various sources of clean water in the locality.

Keywords: organochlorine pesticides, organophosphate pesticides, GC-MS, pesticide contaminants, guideline values.

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Disciplines

Chemistry | Environmental Studies

Note

Undated; publication/creation date supplied

Keywords

Pesticides—Environmental aspects—Philippines—Davao City

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