Liquid Membrane Extraction And Trace Enrichment Of Selected Pesticides In Agroprocessed Fruit Juice And Ethiopian Honey Wine (tej) Samples

Supported liquid membrane (SLM) was optimized for extraction of selected triazine herbicides at microgram level in different type of agro-processed fruit juices and home-made Tej samples prior to HPLC-UV analysis. By appropriate optimization of the SLM parameters, the extraction efficiency and enrichment factor of these herbicides can be improved with good repeatability of the results. For samples spiked at 100 μg L-1 the detection limit ranges from 2.61 μg L-1 for ametryn in Tej to 12.32 μg L-1 for terbutryn in orange juice. The optimized SLM extraction method was linear in pineapple juice at concentration range of 50 μg L-1- 500 μg L-1 with correlation factors greater than 0.99 and average % RSDs less than 5.50% for triplicate analysis. The method was highly selective towards the selected triazine herbicides in all the sample matrices considered, showing no interfering peaks at the retention times of the target analytes and giving well resolved chromatographic peaks. The results suggest that SLM extraction is an alternative method for trace enrichment of wide variety of pesticides from liquid and semi-liquid matrices and could be used as a routine method for trace extraction and enrichment of pesticides from such matrices

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