摘要：A compound of 1, 1, 1, 2-tetrachloroethylene (TET) is used as an inner standard for the determination of trichloroethylene (TRI) and tetrachloroethylene (PER) in detergents used for keeping toilet clean by headspace-gas chromatography. As small peaks appeared near at the retention time of TRI under alkaline solution, however, compounds decomposed from the inner standard solution were investigated. Main compounds, which were produced by the decomposition of the TET, were only TRI under alkaline solution, and chloroform and TRI under alkaline solution with solution hypochloride, and two unknown compounds at the retention times of 1.1 and 1.5 min under acidic conditions with phosphoric acid and sodium hypochloride. According to the regression equation between molecular weight and retention times and the comparison of their retention times with those of each standard, they were identified as methyl chloride and 1, 1-dichloroethylene, respectively.
