手賀沼流入河川における除草剤の動態と分子構造との関係

概要

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In the investigation of the herbicide's fate of the river flowing into Lake Teganuma, CNP and Benthiocarb were found, and Benthiocarb was found in higher concentration than CNP. This different behavior between the two herbicides in the same environment is usually explained by their solubility and adsorption ability. Such physicochemical properties are related to molecular structures. Hydrocarbons and chlorinated biphenyls in aqueous solution show a linear relationship between the logarithm of solubilities and the total surface areas (TSA) or the total molecular volumes (TMV). On the other hand polar compounds which have heteroatoms and polar groups are very soluble. The adsorption equilibrium of the organic compounds has been found to be related to the molecule's contact surface area with the adsorbent surface. The adsorption rate is influenced by molecular shape along with contact probability. Therefore it can be considered that solubility of CNP is lower than that of Benthiocarb and that CNP is likely to adsorb more than Benthiocarb. They occur in accordance with the environmental behavior of the herbicides in a natural environment.
日本水環境学会の論文