Chiral Separation Of Environmental Pollutants In Soil And Its Enantioselectivity Degradation Study

Chiral separation and enantioselective degradation of chiral pesticides become an important and fascinating research field in environment chemistry. It has momentous academic and practice significance to develop simple, fast, sensitive methods for the separation of the enantiomers. Many pesticides are chiral compounds and consist of two or more stereoisomers, which might differ in biological activity, toxicity on beneficial and non-target organisms, and environmental fate. Thus, it is necessary to obtain information on the toxicity and biotransformation of the chiral pollutants by developing a suitable method for the chiral resolution of the environmental pollutants. The dissertation consists of for chapters.Chapter 1 The enantioselective degradation of chiral environment pollution was reviewed. The objective and significance of this dissertation were described in brief.Chapter 2 The method for the separation of imazethapyer enantiomers was developed by using hydroxypropyl-β-cyclodextrin-modified modified capillary electrophoresis. The types and concentration of the chiral selectors, pH were investigated.Chapter 3 Enantioselective degradation of imazethapyer in field soil was investigated by capillary electrophoresis. The enantiomeric ratio values of the two enantiomeric pairs changed from initial about 0.97 to 0.58, respectively. As for enantioselective analysis, the two enantiomers were degraded with half-lives of 6.8 and 7.4 days respectively, indicating an obvious enantioselectivity.Chapter 4 A molecular imprinting polymer (MIP) using imazethapyer as temp late molecule synthesized on the surface of silica. The MIP was characterized by IR spectroscopy and SEM. The static adsorption equilibrium experiments and the Scatchard analysis show that there were two kinds of binding sites. The MIP exhibited better adsorption properties and selectivity compared with the corresponding non-imprinted polymers.