SANGER AND GIBSON. — DETERMINATION OF ANTIMONY. 721 



phurous acid, and the solution, neutralized with sodic hydroxide, was 

 titrated with iodine after addition of acid sodic carbonate. 



In the filtrate from the metallic antimony and zinc, the unreduced 

 antimony in solution was determined also by titration with iodine. 



Four series of determinations were made, using weighed amounts of 

 the tartar emetic solution equivalent respectively to about 150, 100, 

 50, and 10 milligrams of antimony. The results are given in the fol- 

 lowing table. The analyses under columns c and d were made, in 

 Series A and B, with an approximately decinormal solution of iodine, 

 standardized, through sodic thiosulphate and potassic bichromate, 

 against pure iron. In Series C and D an appi'oximately centinormal 

 solution of iodine was used, standardized against a determinate solution 

 of thiosulphate made from the decinormal. 



TABLE I. 



