Residue Analysis of Organochlorine Pesticides in Water and Sediments from Agboyi Creek, Lagos.

Williams, Akan B. (2013) Residue Analysis of Organochlorine Pesticides in Water and Sediments from Agboyi Creek, Lagos. African Journal of Environmental Science and Technology, 7 (5). pp. 267-273. ISSN 1996-0786

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Abstract

Microlayer water, mixed layer water, epipellic and benthic sediments were collected from Agboyi Creek, Lagos to analyse organochlorine pesticide residues. Sampling was conducted between December 2008 and September 2009 during the dry and wet seasons to study effects of seasonal variation on the samples. Water samples were subjected to liquid-liquid extraction using dichloromethane, while sediments were subjected to cold extraction with petroleum ether/acetone (1:1 v/v) mixture and clean-up on silica gel adsorbents. The samples were analyzed for aldrin, dieldrin, endrin, DDT, heptachlor, HCH, endosulfan, chlordane and methoxychlor. The detection and determination of the pesticide residues were performed by injecting 1 μL of purified extract into the injection port of a gas chromatograph with a 63Ni electron capture detector (GC-μECD Agilent 7890A) equipped with ChemStation software. Pesticide residues in the epipellic and benthic sediments were higher than the residues in the water. The mixed layer water showed enhanced levels of residues when compared with the microlayer water. The residue levels were higher during the dry season than the wet season. The levels of residues in the water and sediments were below the maximum permissive residue limits.

Item Type:	Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	Pst Akan Williams
Date Deposited:	02 Mar 2015 09:07
Last Modified:	14 Sep 2017 08:09
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/3611

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