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Organochlorine pesticide residue levels in soil from the Nyando River catchment, Kenya

Abong'o, Deborah (author)
University of Nairobi, Kenya
Wandiga, Shem (author)
University of Nairobi. Kenya
Jumba, Isac (author)
University of Nairobi, Kenya
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van den Brink, Paul (author)
Wageningen University, the Netherlands
Nazariwo, Betty (author)
Makerere University, Uganda
Madadi, Vincent (author)
University of Nairobi, Kenya
Wafula, Godfrey (author)
University of Nairobi, Kenya
Kylin, Henrik (author)
Linköpings universitet,Tema Miljöförändring,Filosofiska fakulteten
Nkedi-Kizza, Peter (author)
University of Florida, USA
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University of Nairobi, Kenya University of Nairobi Kenya (creator_code:org_t)
2015
2015
English.
In: Africa Journal of Physical Sciences. - 2313-3317. ; 2:1, s. 18-32
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Soil samples were collected from six locations representative of the Nyando River catchment area of the Lake Victoria over a period of two years. Sampling was done four times in the year in February, May, September and December 2005 and 2006 in farms where maize, tea, sugar cane, coffee, rice and vegetables have been grown over the years. This coincided with the effects of different seasons and farming activities on residue levels of the pesticides in use. The objective was to investigate levels and distribution of organochlorine pesticides that have either been banned or are restricted for use in Kenya. Organochlorine pesticides investigated were DDT, lindane, aldrin, dieldrin, heptachlor, endrin, endosulfan (both α- and β- isomers and endosulfan sulphate), the sum is called “total” or Σendosulfan and methoxychlor. Prior to the ban or restriction in use, these pesticides had found wide applications in public health for control of disease vectors and in agriculture for control of crop pests. The analysis revealed presence of all the targeted pesticides with the highest mean concentrations for methoxychlor 140 ± 1.5 μg/kg, Σendosulfan (30 ± 2.1 μg/kg), aldrin (18 ± 0.28 μg/kg), respectively. The results show the presence of these pesticides in soils in the basin and this could be impacting negatively on the ecosystem health of the area.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

Keyword

Pesticides
Lake Victoria
water quality
Africa
soil quality
farming

Publication and Content Type

ref (subject category)
art (subject category)

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