Direct-Combustion of Sample-IR Spectrometric Determination of Carbon in Electrolytic Manganese

A portion of the electrolytic manganese sample (0.5-0.8 g), pretreated by cleaning with acetone and drying, was placed in a porcelain crucible, pretreated by igniting at 1 250 ℃ and cooling to room temperature, and mixed with 1.000 g of W-Sn and 0.400 g of pure iron as flux. The crucible with sample and flux was introduced into the C/S analyzer and operated under automatic mode. Content of carbon in the sample was determined by IR-spectrometry in the form of CO2. Precision was tested by analyzing a manganese sample (wC=0.003 8%) for 8 determinations, value of RSD found was 5.3%. Recovery was tested by analyzing a manganese sample of known carbon content (wC=0.006%), value recovery (n=6) found was 102%.