This method is for determining total carbon on catalysts and inother inorganic materials using a high temperature inductionfurnace carbon analyzer. The method is generally applied over arange of 0.01 to 20 mass-% carbon; however, up to 100 mass-% carboncan be determined with appropriate calibration. On used catalyst,the carbon may be present as coke and/or hydrocarbons. If only thecarbon present as coke is desired, hydrocarbons are removed byextraction prior to analysis, as described in UOP Method 602,Soxhlet Extraction of Catalysts. Analysis of catalysts containinglight hydrocarbons can be problematic due to thermal loss of thehydrocarbons before controlled combustion occurs. For suchmaterials, other methods, such as ASTM D5291, InstrumentalDetermination of Carbon, Hydrogen, and Nitrogen in PetroleumProducts and Lubricants, should be utilized.

Analyzers that utilize combustion tube, rather than inductionfurnace technology may be used if it can be proven that they yieldprecision data at least as good as that listed herein.