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 °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

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Analytical chemistry

Instrumentation|

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

Techniques|

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

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

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