<報文>有機水銀の光分解に関する研究

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"Studies on the possibility of photochemical decomposition reaction containlng trace amount of methyl mercurychloride (MMC) in aq. solution by ultraviolet light irradiation were conducted, and the decomposition reaction kinetic and mechanism were also investigated from the point of environmental pollution prevention. Results obtained are as follows; (1) Molecules of MMC in solution were decomposed and transformed to inorganic mercury, the yield of which could be attained to about 100% after six hours irradiation and was not dependent on the initial concentration of MMC (10-1000ppb). (2) It was found that the decomposition reaction could obey the first-order kinetics and had a rate constant of 0.6 hr.⁻¹ (3) Both ethane and monochloromethane as reaction products were identified by gaschromatographic analyzer and gaschromatograph-mass analyzer. Moreover, mixture of metallic mercury and mercurous chloride was found by naked eye observation, especially mercurous chloride was identified by X-ray diffraction. (4) The following reaction mechanism was suggested to account for this photochemical reaction.CH₃HgCl+hν→〔･CH₃+･HgCl〕〔･CH₃+･HgCl〕→･CH3+･HgCl→2･CH₃→C₂H₆ / 2･HgCl→Hg_2Cl₂ 〔･CH₃+･HgCl〕→〔2･CH_3→C₂H₆ / 2･HgCl→Hg₂Cl₂〕→C₂H₆, Hg₂Cl₂ 〔･CH₃+･HgCl〕→〔CH₃Cl+Hg〕→CH₃Cl, Hg"
横浜国立大学の論文