The Malaysian Journal of Analytical Sciences Vol 14 No 2 (2010): 82 – 87

 

 

CHLORPYRIFOS AND MALATHION RESIDUES IN SOILS OF A TERENGGANU GOLF COURSE: A CASE STUDY

 

Norhayati Mohd Tahir*, Khaw Hock Soon, Marinah Mohd Ariffin, Suhaimi Suratman

 

Environmental Research Group (ERG),

 Department of Chemical Sciences, Faculty of Science and Technology,

Universiti Malaysia Terengganu, Mengabang Telipot, 21030 Kuala Terengganu, Malaysia

 

*Corresponding author: hayati@umt.edu.my

 

 

Abstract

A preliminary study was conducted to determine the residues of organophosphorus insecticides, Chlorpyrifos and Malathion, in soils of a local 18-hole golf course in order to evaluate their dissipation rate and half-life values under field condition. Soils samples were collected from 18 stations (greens) three times within a period of one month after its application. The insecticide residues were extracted using soxhlet technique and determined using gas chromatography fitted with a nitrogen phosphorus detector (GC-NPD).  Results obtained indicated that dissipation of these insecticides were fairly fast, with amount dissipated within 30 days ranging from 65.0 to 96.6 % for chlorpyrifos and 63.5 to 95.8% for malathion.  The dissipation of these insecticides from the soils seemed to follow a first order kinetic with half-life values ranging from 3.4 to 15.3 days with average of 6.5 days and 6.8 to 31.3 days with average of 13.5 days for chlorpyrifos and malathion, respectively. It appears that soil physico-chemical properties such as organic matter content, pH, particle size distribution, cationic exhange capacity and moisture content do not exert an influence on the dissipation of these insecticides.

 

Keywords: chlorpyrifos, malathion, residues in soils, golf course, Kuala Terengganu

 

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