5.2.2 Resistance furnace in oxygen and lead borate as decomposing agent
5.2.2.1 Principle
The sample is heated together with lead borate in a stream of oxygen in a resistance tube furnace to convert the carbon to carbon dioxide by combustion. The sample mass and the details of the combustion depend on the method of determination used. The combustion gases are conducted through a tube containing percarbamide to absorb the oxidation products of the sulfur contained in the sample. The carbon dioxide is absorbed in an alkaline medium and determined either coulometrically, gravimetrically, conductometrically or by infrared absorption.