High temperature combustion, typically induction, is used to determine carbon and sulfur content in a variety of materials, both organic and inorganic. Alpha Resources supports the process by providing ceramic crucibles or ceramic boats as well as a certified reference materials. See below for a list of CRMs used in induction analysis of carbon and sulfur.
The Analysis Process: The sample is accurately weighed and placed in a ceramic crucible or boat, along with combustion accelerators (tungsten, tin, copper and/or iron chip). The crucible is placed in a high temperature induction furnace which is then flooded with oxygen. The furnace is heated to 1370-1425°c causing the combustion of the carbon and sulfur in the sample to form CO, CO2 and SO2. The gases are separated and analyzed by infrared absorption. A heated catalyst (rare earth copper oxide or platinized silica) is used to convert the CO to CO2 prior to detection. The infrared absorption detector measures the absorption of the infrared wavelengths characteristic to CO2 and SO2. The amount of infrared absorption at these wavelengths is compared to a known value based on certified reference material and the weight of the original sample.