SOLID-PHASE EXTRACTION OF S-TRIAZINE HERBICIDES BASED ON NEW ORGANIC-INORGANIC HYBRID COPOLYMER

Abstract

In this study, a new organic-inorganic hybrid copolymer (P(MAA-MPTS)/Sil) was synthesized, characterized, and applied as a sorbent for s-triazines. The P(MAA-MPTS)/Sil was prepared by coupling free radical copolymerization of methacrylic acid and methacryloxypropyltrimethoxysilane and sol-gel processing, using tetramethoxysilane as a cross-linker. Scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and nitrogen adsorption-desorption measurements were used for the characterization of the copolymer particles. The extraction efficiency of hybrid copolymer toward s-triazines was studied by batch procedure. High recoveries for all studied compounds (ametryne, atrazine, propazine, simazine, simetryn, and terbuthylazine) were achieved in the pH range 7 - 8 within 30 min. Quick quantitative desorption was achieved using a mixture of methanol and acetic acid. An analytical procedure based on solid-phase extraction of s-triazines on newly synthesized hybrid copolymer and HPLC measurements was developed for their quantification in surface waters. Experiments performed with different types of waters (tap, lake, river) and determination limits achieved demonstrated the successful applicability of P(MAA-MPTS)/Sil in monitoring programs for quality control of tap and surface waters.