Methods for Sample Preparation and Analysis of Residual Levels of Selected Herbicides at Various Production Stages of Sugar from Industries in Ethiopia, Based on Literature Review

G/Kiros, Amenu Asefa (2006) Methods for Sample Preparation and Analysis of Residual Levels of Selected Herbicides at Various Production Stages of Sugar from Industries in Ethiopia, Based on Literature Review. Masters thesis, Addis Ababa University.

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Abstract

Sampling, sample preparation and analysis methods based on supported liquid membrane atrazine and ametryn and phenoxyacid herbicides; 2,4-D. In SLM extraction, neutral herbicides could be extracted from a flowing aqueous solution to a stagnant acidic acceptor solution for the two weakly basic s-triazines and to stagnant basic acceptor solution for the weakly acidic phenoxyacid herbicide. Specifically, a liquid membrane containing 0.1 mol/L sulphuric acid for the triazines and 0.1 mol/L sodium hydroxide for the 2,4-D was suggested. The uncharged herbicide molecules from the flowing aqueous donor solution diffused through a liquid membrane impregnated in a porous poly(tetrafluoroethylene) membrane, immobilized organic solvent, and then will be trapped in a stagnant acceptor phase. The efficiency of the extraction process will be found to depend on the donor solution pH, the amount of the mobile carrier added to the liquid membrane and the concentration of the counter ion in the acceptor solution. From detailed studies, the optimum values of these parameters for the efficient extraction of the herbicides will be determined. The applicability of the method for (SLM) have been proposed for selective extraction of two s-triazine herbicides, namely extraction of these selected herbicides at different stages of production of sugar will be also investigated by spiking analyte sample solutions in sugar-cane juice, syrups, and molasses and sugar crystal samples. The suggested method will be utilized for trace enrichment of the analytes from samples containing matrices of various types and concentrations. A 20 minutes of sample enrichment at a flow rate of 1.0 mL/min, was suggested to determine the concentrations of atrazine, ametryn and 2,4-D in sugar samples at various stages of production.

Item Type:	Thesis (Masters)
Subjects:	H Social Sciences > HD Industries. Land use. Labor Q Science > QD Chemistry Q Science > QK Botany
Divisions:	Africana
Depositing User:	Selom Ghislain
Date Deposited:	15 Aug 2018 12:39
Last Modified:	15 Aug 2018 12:39
URI:	http://thesisbank.jhia.ac.ke/id/eprint/4741

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