[Some evaluations of the Widmark method (author's transl)].

Some evaluations were made on the Widmark method is designed for determination of blood ethanol concentration. A reagent of potassium dichromate-sulfuric acid mixture was found potent within 3 weeks after preparation when kept air-tight in hard glass ware without exposure to light, and 0.01 N sodium thiosulphate reagent was potent within 2 weeks under similar conditions. No change was observed in the potassium dichromate-sulfuric acid mixture reagent even after heating at 50-60 degrees C for 2 hours. Heating for distillation and oxidation of ethanol was satisfactory with air bath in an electric thermostat.