Diphenyl carbazone as an internal indicator in volumetric analysis

Summary A method for the volumetric determination of calcium using diphenyl carbazone as indicator has been described. Calcium is precipitated by excess sodium oxalate, the excess oxalate being determined by standard lead nitrate. A study of the possible interferences of barium and magnesium in the above determination is undertaken and it is shown that the above procedure is applicable to the determination of calcium in the presence of magnesium and barium.Sincere thanks of the authors are due to Professor G. B. Singh for providing the necessary facilities during the course of the above investigation.