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Distribution of pesticide residues in soil due to point source pollution at old Korogwe, Tanzania
Abstract
This paper summarizes the findings of a study carried out to assess the levels of pesticide residues in soil along the old obsolete pesticides storage site at Old Korogwe. Gas chromatography spectrophotometry
equipped with electron capture detector was used in the identification and quantification of the residues. DDT and its metabolites, DDD and DDE, were detected at different distances from the point source. p,p’-DDT was
the predominant residue in all the samples analysed, detected in 92% of samples at a mean concentration of 425.76 + 4.75 μg/g. o,p’–DDT was detected in 33% with a mean concentration of 55.83 + 2.65 μg/g, metabolites p, p’–DDD and p,p’–DDE were detected in 50% and 58% at mean concentrations of 92.5 + 3.50 and 20.84 + 1.72 μg/g, respectively. The detection of higher level of p,p’–DDT than o,p’–DDT in the samples implies contamination was due to technical-grade DDT.
Keywords: DDT, DDD and DDE, Obsolete pesticides, Soil Contamination, Old Korogwe.
