The purpose of ashing is to remove organic material from a sample before analysis. Ash-forming materials are considered to be undesirable impurities or contaminants. By ashing a sample, the organic material is burned away, leaving behind only the inorganic ash residue. This allows for more accurate analysis of the sample's elemental composition.
There are two main categories of ashing: wet ashing and dry ashing. Wet ashing involves using liquid phase reactants, such as combinations of acids, to remove organic material from the sample. Dry ashing, on the other hand, involves controlled combustion of the sample in air. Both methods aim to sufficiently heat the sample to cause oxidation and removal of organic material.
Ashing is commonly used in various industries, including the food and petroleum industries. It is particularly useful in analyzing inorganic components in organic samples, such as petroleum, plastic, and biological samples. Ashing can also be used on a large scale to remove harmful chemicals, like toxic metals, from plastic waste.
To perform ashing, a purpose-built ashing furnace is typically used. These furnaces are designed specifically for the product(s) being tested and ensure complete combustion of the sample. The furnace typically has a heating element, an enclosure, and a scale for weighing the sample before, during, and after it is burnt.
When choosing an ashing furnace, factors such as the specific application, adherence to testing standards, potential contamination risk, and sample size should be considered. There is no standard model for ashing furnaces, so they often need to be purpose-built for specific purposes.
In summary, the purpose of ashing is to remove organic material from a sample before analysis, allowing for accurate determination of the sample's elemental composition. Ashing can be done through wet or dry methods and is commonly used in various industries. Purpose-built ashing furnaces are used to ensure complete combustion of the sample and accurate results.
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