The structural elements (ultimate analysis) of the organic portion of wood are carbon (45 - 50 percent), oxygen (40 - 45 percent), hydrogen (4.5- 6 percent) and nitrogen (0.3 - 3.5 percent). The distinct advantage of woody biomass over fossil fuels is the small amount of sulfur. The ultimate analysis of some tree species show that carbon and hydrogen contents are rather uniform among species. Bark has a higher percentage of carbon and hydrogen than wood.
A Carbon Hydrogen and Nitrogen Analyzer can be used for CHN analysis or combustion analysis to determine the carbon, hydrogen and nitrogen content in coal, coke, petroleum, biomass products and other combustibles.
Sterling Analytical uses state-of-the-art LECO Instruments to provide superior accuracy and reliability. LECO Combustion Analysis successfully detects low levels of carbon, sulfur, nitrogen, oxygen and hydrogen (from 0.1 to 100 percent, depending upon the sample type).
Performed in accordance with ASTM D5373, LECO Combustion Analysis methods include: Carbon, Hydrogen, Nitrogen, and Oxygen analysis. SULFUR analysis is performed in accordance with ASTM D1552 (OIL) and ASTM D4239 (SOLID).
Applications for combustion analysis involve only the elements of carbon (C), hydrogen (H), nitrogen (N), and sulfur (S) as combustion of materials containing them convert these elements to their oxidized form (CO2, H2O, NO or NO2, and SO2) under high temperature high oxygen conditions. Notable interests for these elements also involve measuring total nitrogen in food or feed to determine protein percentage, measuring sulfur (ASTM D4239) in petroleum products and wood products.