lOO BIBLIOGRAPHY OF ANALYTICAL CHEMISTRY OF MANGANESE 



1896: 14 Riirup 

 (c) Gibbs (pyrophosphate). 



1867; 3 Gibbs 



1893: II Kosnian 

 IV. By miscellaneous methods. 

 (a) by difference. 



(B) BY VOLUMETRIC METHODS. 



I. By titration with potassium per- 

 manganate solution. 

 (a) Direct titration. 

 1863: 2 Guyard 



