ASTM D6143 Iron Content of Bisphenol A (4,4’–Isopropylidenediphenol)

ASTM D6143 Iron Content of Bisphenol A (4,4’–Isopropylidenediphenol)

The ASTM D6143 test method describes the procedure to determine the iron content of bisphenol A (4,4’-isopropylidenediphenol). In this test method, iron may also increase the color of bisphenol A and can affect other properties of end-use products.


    The ASTM D6143 is a standard test method for the iron content of bisphenol A (4,4’- isopropylidenediphenol). Bisphenol A (BPA) has a lower detection limit of 0.1 mg/kg and a  higher detection limit of 20 mg/kg in this test technique. BPA is also used in the process of manufacturing polycarbonate plastics and epoxy resins as a  plasticizer. Specifically, it is used for packaging foods and beverages, baby bottles, thermal papers, and dental sealants. 

    Test procedure:

    For ASTM D6143, bisphenol A is dissolved in methanol before being acidified with hydrochloric acid to convert any ferric iron to ferrous iron. It is necessary to dilute the sample if the iron content is higher. The ferrous iron is subsequently complexed with Ferrozine to generate a red/pink chromophore that can be measured at 560 nm using visible spectrophotometry. 

    Specimen size:

    For ASTM D6143 test procedure, 5 g of sample bisphenol A to the nearest 0.1 mg into a 100-mL volumetric flask is used.


    The ppm iron in bisphenol A is calculated as follows: 

    absorbance at 560 nm × (D) × (F) 


    D= dilution factor 

    F= absorbance factor 

    As per the ASTM D6143, iron in the bisphenol A is reported to the nearest 0.1 µg/g.


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