Occurrence and Distribution of Organochlorine Pesticide Residues in Water and Soil Samples from Kargi Area, Marsabit County, Kenya

Authors

  • Vincent O. Madadi  Department of Chemistry, School of Physical Sciences, College of Biological and Physical Sciences, University of Nairobi, P. O. Box 30197-00100, Nairobi, Kenya.

Keywords:

Marsabit, Kargi, Soil & Water quality, organochlorine pesticides residues, environmental health

Abstract

This work investigated organochlorine pesticides residue levels in water and soil from Kargi area of Marsabit County, Northern Kenya. The population of Kargi has experienced high incidences of ill health conditions associated with environmental factors which has raised public concern and interest to delineate the causes. Several organic and inorganic compounds are known to cause toxicity to human health when they occur at high levels in environment, especially pesticides, polychlorinated biphenyls, polyaromatic hydrocharbons, polychlorinated dibenzo-paradioxins/furans among other organics. Inorganic chemical of concern in water include arsenic, nitrites and fluorides. The main objective of this study was to determine whether pesticides contamination in water and soil could be contributing to ill health conditions in Kargi area. We focused on organochlorine pesticides due to the fact that these were widely applied in Kenyan environment in the past, particularly in agriculture and desert locust control leading to high environmental prevalence, obsolete stocks and contaminated soils. We collected water samples in 2.5 L amber glass bottles, whereas soil was collected in aluminum foil and packed in ziplock bags. After extraction and cleanup, pesticide residues were analysed using Agilent 6890N gas chromatograph equipped with a micro-electron capture detector. Pesticide residues in water ranged from <0.001-3.370 µg/L and from <0.001-17.141µg/kg in soil. The residues in soils were approximately ten times higher than the levels measured in water. Pesticide residues detected in water samples were well below the WHO maximum limits and also below the background levels detected in other parts of the country. Therefore the residues levels measured in water and soil samples in this study could not be associated to the high incidences of ill health and cancer experienced in the region. Further sampling to compare levels in wet and dry seasons could help to establish environmental effect on water contamination.

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International Journal of Scientific Research in Science, Engineering and Technology

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Published

2017-08-31

Issue

Volume 3, Issue 5, July-August-2017

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Research Articles

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[1]
Vincent O. Madadi, " Occurrence and Distribution of Organochlorine Pesticide Residues in Water and Soil Samples from Kargi Area, Marsabit County, Kenya, International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 3, Issue 5, pp.91-99, July-August-2017.