Study of Flow-Through Sample Preparation Methods for Group of Pesticides Determination in Soil by Reversed-Phase High-Performance Liquid Chromatography

摘要

Soil is a heterogeneous system containing organic and inorganic matter. It contains solid particles, soil colloids and gases among which equilibrium is established [1]. Soil from this point-of-view is a complex matrix and the isolation of analytes from soil is a complex analytical problem [2]. From literature survey clearly follows that the soil sample pre- treatment is usually a critical and time consuming step also due to presence of humic substances. The basis of successful analytical method for determination of pollutant residues in complex matrices at trace concentration levels is the use of selective isolation techniques [3, 4] enabling isolation of analytes with high recovery and with minimum quantity of matrix co-extracts. Flow-through methods, namely matrix solid phase dispersion (MSPD) and off- line flow-through solid-liquid extraction (FSSLE) for isolation eight common pesticides (atrazine, propazine, simazine, terbutrine, metoxuron, cloquintocet-mexyl, cypermethrin and permethrin) from soils before their RP-HPLC analysis were studied.