. Transactions of the Royal Society of New Zealand. The precipitate, which remains in a, is washed with asmall quantity of a solution containing zinc-sulphate andammonium-nitrate, in which it is practically insoluble. The liquid which collects in b is then transferred to agraduated flask of 100 capacity. It saves time, however,if the liquid is filtered directly into a measuring-flask to whicha side tube is attached (Fig. 2).. After dilution 10 of the solution is treated with anequal volume of decinormal silver-nitrate, and -^ sulpho-cyanide added until a red colour is developed with
. Transactions of the Royal Society of New Zealand. The precipitate, which remains in a, is washed with asmall quantity of a solution containing zinc-sulphate andammonium-nitrate, in which it is practically insoluble. The liquid which collects in b is then transferred to agraduated flask of 100 capacity. It saves time, however,if the liquid is filtered directly into a measuring-flask to whicha side tube is attached (Fig. 2).. After dilution 10 of the solution is treated with anequal volume of decinormal silver-nitrate, and -^ sulpho-cyanide added until a red colour is developed with ferric sul- 1 6 1 12 1 6 1 12 1 6 1 12 Robertson.—Detection and Estimation of Alkaloids. 55 phate. Concordant results were obtained at different dilu-tions, and in the presence of varying amounts of nitric acid,zinc-sulphate, ami ammonium-sulphocyanide, provided thatexcess was present. The results obtained with a decinormal solution of quinineare given in Table II. Table II.—Showing the Number of Equivalents of Zincand Sulphocyanide added to One Equivalent of Quinine,the Number of Equivalents of Sulphocyanide removed bythe Quinine, and the Total Volume of the Solution. Sulpho- Total Sulpho- Quinine. Zinc. cvatiide T7 , _ cvanide added. Volume- removed. 10 30 35* 10 30 35* 20 40 3-4 20 40 3-55 10 60 3-45 10 60 3-5 * These results are the mean of a number of closely concordantexperiments in solutions with varying amounts
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