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Evaluation on Contamination Level of Organochlorine Pesticides in Soil<br />

Samples from Lowland Paddy Field<br />

Bibie Evana Osman<br />

Supervisor: Dr. Wan Mohd Afiq Wan Mohd Khalik<br />

Bachelor of Science (Analytical and Environmental Chemistry)<br />

School of Marine and Environmental Sciences<br />

Universiti Malaysia Terengganu<br />

The research work aims to determine the contamination level of organochlorine<br />

pesticides present in the surface soil samples from lowland paddy field was<br />

successfully conducted. Soil samples were collected at five different stations, which<br />

situated in Machang district, Kelantan and the frequency of sampling is twice.Surface<br />

water was reported having an acidic characteristic, pH 5.56-6.50 and dominated by<br />

sand-soil type (59.68-77.02%). Analysis of pesticide residue in soil samples was<br />

conducted using soxhlet extraction (hexane:acetone 50:50), florosil clean-up and final<br />

determination using gas chromatography-electron capture detector. Finding study<br />

indicate six organochlorine pesticides namely DDT, α-HCH, β-HCH, δ-HCH, γ-HCH and<br />

endosulfan sulfate were reported present with concentrations ranged from 1.952<br />

mg/kg to 0.032 mg/kg. Chronic daily intakes (CDI) for adults were calculated at mean<br />

3.378 x 10 -9 while children at mean 2.006 x 10 -7 .The hazard quotient showed the value<br />

< 1 defined less risk of health effect toward human.<br />

1936 | UMT UNDERGRADUATE RESEARCH DAY 2018

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