90 BIBLIOGRAPHY OF ANALYTICAL CHEMISTRY OF MANGANESE 



1898: 5. Engel, C. Analyse electrolytique, dosage des m^taux 

 precipitables par le sulphure ammonique. 



L'Eclairage electrique, 14, 106; Chem. Centrbl. 1898, b, 557; 

 Ztschr. Elektrochem., 5, 37; School Mines Qtiart., 20, 302; J. 

 Soc. Cherq. Ind.. 17, 796. 

 Electrolytic separation from iron, cobalt, and nickel. 



1898: 6. Ford, A. P., and Bregowsky, J. M. Use of Hydrofluoric 

 Acid in the Determination of Manganese in Iron and Ores. 



J. Am. Chem. Soc, 20, 504; Chem. Centrbl.. 1898, b, 508; Chem. 

 Ztg., 22, 198, Rep.; Bull. soc. chim. (3), 22, 9; Chem.-techn. Rep. 

 37, 610; Wagner's Jsb., 44, 121; J. Chem. Soc. (Lond.), 74, b, 

 540; School Mines Quart., 20, 303; J. Soc. Chem. Ind., 17, 796; 

 Analyst, 23, 303. 



Use of hydrofluoric acid to hold the silica in solution when precipi- 

 tating manganese peroxide by the Williams method (1881: 18). 



1898: 7. GoocH, F. A., and Austin, M. The Estimation of Mangan- 

 ese as the Sulphate and as the Oxide. 



Am. J. Sci. (4), 5, 209; Ztschr. anorg. Chem., 17, 264; Chem. Ztg. ,^ 

 22, 212, Rep.; Chem. Centrbl., 1898, b, 11 50; J. Chem. Soc. 

 (Lond.), 74, b, 646; J. Iron Steel Inst., 1898, b, 558; Chem. News, 

 77, 2^^: Btill. soc. chim. (3), 20, 694; Wagner's Jsb., 44, 121; 

 Eng. Min. J., 65, 585; Chem.-techn. Rep., 37, 610. 



Determination as sulphate and as oxide. 



1898: 8. GoocH, F. A., and Austin, M. On the Determination of 

 Manganese as the Pyrophosphate. 



Am. J. Sci. (4), 6, 233; Ztschr. anorg. Chem., 18, 339; Chem. 

 Centrbl., 1899, a, 378; Chem. News, 78, 239 and 246; Chem. 

 Ztg.. 22, 319. Rep.; Bull. soc. chim. (3), 22, 197; Wagner's Jsb., 

 44, 122; J. Chem. Soc. (Lond.), 76, 128; School Mines Quart., 

 20, 303 and 400: Analyst, 24, 52. 

 Study of the proper conditions for precipitation as phosphate. 



1898: 9. GoocH, F. A., and Austin, M. On the Condition of 

 Oxidation of Manganese Precipitated by the Chlorate Process. 



Am. J. Sci. (4), 5, 260; Ztschr. anorg. Chem., 17, 253; Chem. 

 Centrbl., 1898, a, 1203; Ztschr. angew. Chem., 1898, 664; Chem. 

 News, 77, 269 and 279; Chem. Ztg., 22,212, Rep.; Wagner's Jsb., 

 44, 121; J. Chem. Soc. (Lond.), 74, b, 645; School Mines Quart., 

 20, 303; J. Soc. Chem. Ind., 17, 796. 



Precipitation with sodium chlorate and solution of the oxide in a 

 sulphuric acid and potassium iodide solution, and titration for the 

 liberated iodine with thiosulphate ; or reduction of the oxide 

 with arsenious acid and titration of the excess of that reagent. 



