The electrophoretic mobilities (μ
e) of phenol and chlorinated phenols were determined using a fused-silica capillary tube (50 μm i. d. and 75 cm long) at pH 612 and 21°C. The experimental conditions, such as the sample and buffer (phosphate and carbonate) concentrations and the high voltage, were optimized in order to obtain a reproducible μ
e. The electric mobility of anions (μ
A-) and the p
Ka of phenols were determined by applying a least-squares method based on the equation μ
e=μ
A-/(1+[H
+]/
Ka) to the data for μ
e vs. pH plots. The μ
A- values were found to increase in the following order: phenol<2-chlorophenol (CP)<3-CP<2, 6-dichlorophenol (DCP)<2, 5-DCP≤4-CP<3, 5-DCP<2, 4, 5- trichlorophenol<2, 3, 4, 6-tetrachlorophenol. It was found that the order of μ
A- among the geometrical isomers of CPs as well as DCPs agrees with that of pKa of the respective isomers.
抄録全体を表示