The use of dimethylphei~yIbenzylammoniun~ chloride as a reagent for the gravimetric determination of platinum was recommended by Ryan (1). Westland and \Vestland (2), in a critical examination of the method, suggested a revised procedure to correct deficiencies they had found in the original method; unfortunately, their comments are based upon the use of impure reagent and are only valid in that instance. Their reagent was prepared by mixing coininercial dimethylaniline ...
