Loss on Ignition / Loss on Drying / Thermogravimetric analysis
Loss on Ignition (LOI)
Loss on ignition describes the process of measuring the weight change of a sample after it has been heated to high temperature causing some of its content to burn or to volatalise. Weight change of the sample is monitored during the heating process and this is required, for example, in the determination of organic matter content in materials such as sediment, sludge, soil and waste. Inorganic materials such as cement, lime, calcined bauxite and refractories can also be tested by loss on ignition.
Loss on Drying (LOD)
Loss on drying is a widely used test method to determine the moisture content of a sample, although occasionally it may refer to the loss of any volatile matter from the sample. Loss in drying does not usually refer to molecularly bound water or water of crystallisation.
Thermogravimetric analysis (TGA)
This is commonly used to determine selected characteristics of materials that exhibit either mass loss or gain due to decomposition, oxidation, or loss of volatiles (such as moisture). For thermogravimetric analysis the weight change of the sample must be continually monitored during the heating process.
Carbolite Gero manufactures a number of standard products with an integrated weighing balance such as the AAF-BAL for organic loss on ignition, the CWF-BAL for inorganic loss on ignition and the ABA 7/35B for asphalt binder content measurement. Custom designed products can also incorporate an integrated balance for loss on drying, loss on ignition and thermogravimetric analysis. Some examples of these can be seen on the custom designed product pages.