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|Title: ||ORGANOCHLORINE PESTICIDE RESIDUES IN ORANGE AND TOMATO SAMPLES FROM PIASA ATEKELT TERA, ADDIS ABABA|
|Authors: ||Ashenafi, Geletu|
|Advisors: ||Dr. Tarekegn Berhanu|
Prof. Nigussie Retta
|Keywords: ||Organochlorine pesticide|
Tomato and orange
|Copyright: ||Jun-2009 |
|Date Added: ||22-May-2012 |
|Publisher: ||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
|Appears in:||Thesis-Food science and Nutriation |
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