The Malaysian Journal of Analytical Sciences Vol 14 No 2 (2010): 76 – 81
ADSORPTION OF FORMULATED CHLORPYRIFOS ON SELECTED
AGRICULTURAL SOILS OF TERENGGANU
Tay Joo Hui1,2, Marinah Mohd Ariffin1,
Norhayati Mohd Tahir1*
1Environmental
Research Group (ERG), Department of Chemical Sciences,
Faculty of Science and Technology,
Universiti
2Faculty of
Industrial Sciences and Technology (FIST), Universiti Malaysia Pahang (UMP),
Lebuhraya Tun Razak, 26300 Gambang,
Kuantan, Pahang Darul Makmur.
*Correspondence author:
hayati@umt.edu.my
Abstract
In
this study, the adsorption of commercially formulated chlorpyrifos (trade name Kensban®, 20% a.i.) in three soil samples (0-25cm depths)
collected from vegetable farms in the state of Terengganu, Malaysia has been
investigated using a batch technique.
Analysis of the insecticide was carried out using gas chromatography
equipped with nitrogen and phosphorus detector.
Result indicated that, soils contained higher organic matter and clay
content exhibited a much stronger adsorption affinity for the insecticide. In addition, soil pH was also observed to
play a role in influencing the adsorption affinity of this insecticide where a
higher adsorption was observed for soils with lower pH values. Results from this study clearly showed that,
in agreement with previously reported studies, soil properties particularly
organic matter content, clay content and pH play an important role in controlling
the sorption behaviour of chlorpyrifos insecticide. However, it must be conceded that the
measured adsorption in this study might also be influenced by a number of
processes occurred in the soil, such as complex interaction between
chlorpyrifos, solvent, emulsifier, water and the soil sorption sites since the
applied chlorpyrifos was a commercial formulation.
Keywords: adsorption, chlorpyrifos, organophosphorus
insecticide, agricultural soil, GC-NPD
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