ASTM D6142 Analysis of Phenol by Capillary Gas Chromatography

ASTM D6142 Analysis of Phenol by Capillary Gas Chromatography

The ASTM D6142 test method covers the determination of known impurities in phenol by gas chromatography (GC). It is typically used for the examination of phenol with a purity of 99.9% or higher.

    Scope: 

    The ASTM D6142 is a standard test technique for capillary gas chromatography analysis of  phenol. This test method can be used to create phenol requirements and as an internal quality  control tool in situations where phenol is manufactured or used in a manufacturing process and  can also be employed in phenol-related development or research. It’s widely used to identify  contaminants like mesityl oxide, cumene, hydroxy-acetone, acetone, alpha-methylstyrene, 2- methylbenzofuran, acetophenone, o-cresol, and m & p-cresol, among others. Purity is generally  calculated by subtracting the predicted contaminants from a total of 100.00. 

    Test procedure:

    A known amount of an internal standard is added to a phenol sample for ASTM D6142 test. A gas  chromatograph with a flame ionisation detector is used to mix the prepared sample and analyze it  (FID). Each impurity’s peak area, as well as the internal standard, is measured. The amount of  each impurity is determined by the ratio of the internal standard’s peak area to the impurity’s  peak area. The results are expressed in milligrams per kilogram (mg/kg). 

    Specimen size:

    Sample of Phenol is used as test specimen in this ASTM D6142 test procedure. 

    Data:

    As per the ASTM D6142, the concentration of each impurity is calculated as follows :

    where: 

    Ri = response factor for impurity I relative to internal standard 

    Ai = peak area of impurity  

    As= peak area of the internal standard 

    Cs = concentration of the internal standard 

    Ci = concentration of impurity 

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