Abstract
Abstract Fourteen technical pentachlorophenol and 3 sodium pentachlorophenate samples were obtained from several manufacturers and analyzed for the presence of various chlorinated phenolic impurities. Reverse phase liquid chromatography with an electrochemical (coulometric mode) detector was used for qualitative and quantitative determinations. Nineteen chlorinated phenols were separated using a 50–70% methanol and 50–30% 0.02M KH2P04 (pH 4.0) 35 min gradient system on a Spheri-5 RP-18 column. 2,4-Dichlorophenol (average 0.07%); 3,5-dichlorophenol, 2,3,4-trichlorophenol, 2,4,6-trichlorophenol, 3,4,5-trichlorophenol (each <0.03%); 2,3,5,6-tetrachlorophenol (average 0.009%); 2,3,4,6-tetrachlorophenol (average 4.47%); 2,3,4,5-tetrachlorophenol (<0.025%) were detected as contaminants in the various samples. The minimum detectable amount ranged from 0.1 to 10 ng, depending on the chlorophenol.
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