Abstract
p-Chlorophenol present in various Clofibrate preparation was on determined by colorimetry, using a quantitative method for phenolic OH. This method is based on the widely used technique for colorination of indophenol, modified and adapted for phenolic OH in p-chlorophenol. As a result, a large difference was found in the commercial products of 11 companies. It does not seem that serious trouble will occur even in the product containing highest concentration of p-chlorophenol, but considering high toxicity of p-chlorophenol, it had better be as low a concentration as possible.
