Akademik Veri Yönetim Sistemi
7th World Congress on Civil, Structural, and Environmental Engineering, CSEE 2022, Virtual, Online, 10 - 12 Nisan 2022
© 2022, Avestia Publishing. All rights reserved.Pesticides have been used widely all over the world for centuries to increase agricultural production and to combat harmful pests. Pesticides used for agriculture, household, and public health sectors eventually reach water bodies, posing a risk to human health and the environment even in micro concentrations. Each country legally sets its own maximum allowable limits to regulate pesticides residues. Therefore, it is necessary to monitor pesticide residues in water resources, especially if they are used for drinking water purposes. With the technological developments, nowadays sensitive analytical instruments employing complex analysis methods such as GC/MS and LC/MS have been used to analyze pesticides. Pesticide residues must be concentrated by different extraction methods before HPLC analysis to be able to detect them in micro levels with high precision and low detection limits. The aim of this study is to develop an analytical method for the analysis of acetochlor and metolachlor pesticides by HPLC instrument with dispersive liquid-liquid micro extraction (DLLME) method. In order to determine optimum conditions for DLLME extraction method, extraction solvent type (chloroform, dichloromethane and 1,2 dichloroethane), dispersive solvent type (acetonitrile, methanol and isopropyl alcohol), flowrate (1, 1.2 and 1.5 ml/min), oven temperature (20°C, 30 °C, 40 °C and 50 °C), volume of extraction solvent (300, 350 and 400 µl), and mobile phase mixture (60/40, 70/30 and 80/20 acetonitrile/water in v/v) were comprehensively investigated with Taguchi experimental design. The optimized conditions for acetochlor and metolachlor were obtained as: extraction solvent of 1,2-dichloroethane, dispersive solvent of acetonitrile and methanol, extraction solvent volume of 400 µL and 300 µL, dispersive volume of 1 ml, flowrate of 1 ml/min and 1.2 ml/min, temperature of 40°C and 50°C and mobile phase mixture of 70/30 v/v and 80/20 v/v, respectively.