除草剂化性与环境中残留 - national taiwan university.pdfVIP

1 留 立 了 理度 留 類 類 不 留 理 理 來論 來說 留 Chemical Characteristic of Herbicide and Environmental Residue Yei-Shung Wang Department of Agricultural Chemistry, National Taiwan University Abstract Behavior and distribution of herbicides in the soil environment are affected not only by the factors of the soil environments, but also by the chemical and physical properties of herbicide itself, such as water solubility, vapor pressure, chemical stability and etc. Influence of chemical characteristic of herbicide 2 93 年6 compounds on absorption and residues in the soil environment are studied in this research, the possibility of the herbicide to contaminate groundwater is also discussed. Functional group(s), substituting group(s), related position between the functional group and the substituting group in chemical structure and presence of unsaturated chain affect chemical character in charge, polarity and polarizability and then affect the adsorption and residue of herbicide in soil environment. Due to the complication of soil environment, absorption and residue of herbicide in the soil are difficult to explain only with chemical characteristic. Physical properties of herbicide, character of soil, biological factors and climatic conditions most be discussed together. Potential of herbicide to contaminate groundwater are predicted in this study. Key words: chemical characteristic of herbicide, absorption, residues, groundwater pollution.