Direct Combustion with Resistance-type Tubular Furnace-IR Absorption Spectrometric Determination of Carbon and Sulfur in Ferrosilicon

A method for the determination of carbon and sulfur in ferrosilicon by IR absorption spectrometry with direct combustion of sample in resistance type tubular furnace was proposed. The optimum experimental conditions were found as follow: ① amount of CuO (as flux): 1.5 g; ② amount of sample: 0.2-0.3 g; ③ analytical time for carbon and sulfur: 60 s. Values of detection limits of the method found were 0.001% for sulfur and 0.004 % for carbon. Test for accuracy and precision was made by analyzing the standard sample BH1917-1, giving results in consistency with the standard values. Values of RSD′s (n=10) of carbon and sulfur found were less than 4% and 8% respectively.