Organochlorine Pesticide Residues in Orange and Tomato Samples from Piasa Atekelt Tera, Addis Ababa
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Date
2009-06
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Addis Ababa University
Abstract
The concentration levels of ten organochlorine pesticides have been investigated in tomato and orange samples purchased from Piasa Atekelt Tera market, Addis Ababa. Sampling technique was used based on the Quality and Standards Authority of Ethiopia, standard sampling method ( ES ISO874:2007) and from United Nation Food and Agricultural Organization(FAO:2002).
A standard analytical method was used for extraction of the pesticides in fruits and vegetables. Since the method was out of scope it validated before application to the analysis of these pesticides. Accordingly the limit of detection (LOD), Limit of quantification (LOQ),
repeatability and reproducibility, and percentage recovery were determined. Target analytes were determined using GC-MS. The Spiked recovery results for five analytes were within the acceptable international standard . The LOD value and LOQ value are below the LCL and MRL
of the analyte. Precision of the method was measured in terms of repeatability and
reproducibility expressed in terms of percentage relative standard deviation (% RSD) values. The %RSD of all detected analytes were less than the acceptable international standard (<20%).
The study found that both orange and tomato samples were contaminated by the five and four type of OCPs out of ten target analyte, respectively. In orange sample g- HCH, heptachlor,
aldrin, endosulfan and DDT were detected while in tomato heptachlor, aldrin, endosulfan and DDT were detected. However from the detected analytes none of them above the international MRL values.
Keywords: Organochlorine pesticide, Tomato and orange, Method validation, maximum residue limit
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Keywords
Organochlorine Pesticide, Tomato and Orange, Method Validation, Maximum Residue Limit