Sample Preparation Methods For Quantitative Extraction Of Triazine And Its Metabolites In Sediment Samples Of Awassa And Ziway Lakes

A total of 21 sediment samples were collected from Awasa and Ziway Lakes for triazinernherbicide residues and their metabolites analysis. The samples were air dried andrnextracted following standard procedures. All of the organic extracts were yellow coloredrnand also some particulates were present. For this reason and for the possible presence ofrnmacro-organic compounds a florisil clean up was carried out. The intense yellow color ofrnthe extracts was significantly reduced but it was not totally removed, therefore, furtherrnclean up by activated charcoal is required. Moreover, the moisture contents of thernsediment samples were also determined prior to the analyte extraction. It was found thatrnthe moisture contents determined were around 1 %, except fro one sample collected fromrnZiway whose value was around 3.8 %. The relatively high value obtained here could berndue to muddy nature of the sample, which could also be seen visually. The extracts werernstored at 4oC in a refrigerator for future HPLC analysis

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