Ashing

This article is about the test in petroleum manufacturing. For the semiconductor manufacturing process, see plasma ashing.

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^oC, cooled and weighed.

Ashing is also performed prior to chemical analysis by inductively coupled plasma emission spectrometry.

Analytical chemistry

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

Techniques	Calorimetry Chromatography Electroanalytical methods Gravimetric analysis Mass spectrometry Spectroscopy

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

Calibration	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

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Ashing

See also