Nitrogen percentage of the products were varied from to . Sorbents with predicted capacity of , , , and were synthesized. The results showed that the actual capacities of the products were close to the predictions, especially for those in the experimental domain, indicating a good model that can be used to prepare sorbents of any desired capacity. | Primary and secondary amine material based on crosslinked polystyrene: synthesis and initial application for multiresidue pesticides analysis TẠP CHÍ PHÁT TRIỂN KHOA HỌC & CÔNG NGHỆ: 47 CHUYÊN SAN KHOA HỌC TỰ NHIÊN, TẬP 2, SỐ 2, 2018 Primary and secondary amine material based on crosslinked polystyrene: synthesis and initial application for multiresidue pesticides analysis Huynh Minh Chau, Vo Dinh Thien Vu, Nguyen Thao Nguyen, Nguyen Anh Mai applied as sorbent of various analytes [1-4] due Abstract—Weak anion exchange sorbent based to their advantageous properties, namely, high on cross-linked polystyrene with primary surface area, chemical resistance, rigid structure. secondary amine group was prepared by Crosslinked polystyrene with full of phenylene substitution nucleophilic reaction (SN2) between rings in its structure offers p-p interaction to methylene chloride group and 1,2-ethylene aromatic analytes [5]. Nevertheless, surface diamine. The effect of factors, namely the weight ratio of amine over methylene chloride, reaction modification by polar or ionic functional groups, time and temperature on nitrogen percentage were . sulfonated -SO3-, would support polar-polar studied using experimental design approach. The and electrostatic interaction [6]. amination yield rose as all of factors increased but QuEChERS (stand for Quick, Easy, Cheap, was reduced while both temperature and time Effective, Rugged, and Safe) – introduced by increased simultaneously. Nitrogen percentage of the products were varied from to . Anastassiades et al. [7] – was developed as a Sorbents with predicted capacity of , , sample preparation method for multiresidue- , and were synthesized. The results pesticide determination in fruits and vegetables. showed that the actual capacities of the products The method includes three main steps (i) the were close to the predictions, especially .
