Asbestos in Permanganate Titrations

Abstract

FORthe determination of calcium in limestone and in other silicate rocks, the usual procedure {2, 6, 7, 8) is to precipitate the calcium as calcium oxalate from the filtrate from which silica, iron, aluminum, and manganese have been removed. According to the procedure of the authors cited and of many others, if the calcium in the purified precipitate is to be determined volumetrically,