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Ashing is a test to deduce the amount of ash forming material present in a petroleum product so as to decide its use in certain applications. Ash-forming materials are considered to be undesirable impurities or contaminants.

The specimen is placed in a suitable vessel, evaporating dish or crucible and ignited. It is allowed to burn until only ash and carbon remains. The carbonaceous residue is reduced to ash by heating in a muffle furnace at about 775 °C, cooled and weighed.

Ashing is also performed prior to chemical analysis by inductively coupled plasma emission spectrometry. Another application is the detection of asbestos content in certain products.
See also

Ash (analytical chemistry)
Inductively coupled plasma emission spectrometry
Atomic absorption spectroscopy


Analytical chemistry

Atomic absorption spectrometer Flame emission spectrometer Gas chromatograph High-performance liquid chromatograph Infrared spectrometer Mass spectrometer Melting point apparatus Microscope Optical spectrometer Spectrophotometer


Calorimetry Chromatography Electroanalytical methods Gravimetric analysis Ion mobility spectrometry Mass spectrometry Spectroscopy Titration


Coning and quartering Dilution Dissolution Filtration Masking Pulverization Sample preparation Separation process Sub-sampling


Chemometrics Calibration curve Matrix effect Internal standard Standard addition Isotope dilution

Prominent publications

Analyst Analytica Chimica Acta Analytical and Bioanalytical Chemistry Analytical Chemistry Analytical Biochemistry

Chemistry Encyclopedia



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