ASTM D7884 Determination of Carboxybenzaldehyde and Toluic Acid

ASTM D7884 determines the 4-Carboxybenzaldehyde (4-CBA) and p-Toluic acid (p-TOL) in purified terephthalic acid (PTA) by reverse-phase high-performance liquid chromatography (HPLC). The values are expressed in the SI unit.... Read More

  • Average 30% Cost
    Savings

  • 100% Confidentiality
    Guarantee

  • Free, No-obligation
    Consultation

  • 100% Customer
    Satisfaction

    TRUSTED BY ENGINEERS FROM

    Scope:

    ASTM D7884 is useful to create specifications and can be used as an internal quality control tool in places where these items are manufactured or used. The presence of 4-CBA and p-TOL slows down the polymerization process and 4-CBA colorizes the polymer due to thermal instability.

    Procedure:

    In ASTM D7884, the PTA sample is dissolved in an ammonium hydroxide solution and a fixed volume of the ammonium hydroxide solution is introduced into a high-performance liquid chromatograph equipped with a UV detector. The contaminants – 4-CBA and p-TOL – are separated from PTA using a C18 chemically bonded column. For quantification, an external standard calibration is used.

    Video 01: High Performance Liquid Chromatography (HPLC)

    Specimen size:

    The temperature should be maintained at a constant 61°C within the range of 20 to 70°C.

    Data

    In ASTM D7884, the concentration of 4-CBA or p-TOL in mg/kg is calculated using the following equation:

                                      X = ms ·A·Cs ÷ m·As

    Where;

    X = concentration of 4-CBA or p-TOL in the PTA sample, mg/kg,

    A = peak area of 4-CBA or p-TOL in the PTA sample,

    m = weight of the PTA sample, g,

    As = peak area of 4-CBA or p-TOL in the PTA standard,

    Cs = concentration of 4-CBA or p-TOL in the PTA standard, mg/kg,

     ms = weight of the PTA standard, g.

    Conclusion:

    ASTM D7884 is useful to create specifications and can be used as an internal quality control tool in places where these items are manufactured or used.

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      ddd Just share your testing requirements and leave the rest on us!
      • Quick Turnaround and Hasslefree process
      • Confidentiality Guarantee
      • Free, No-obligation Consultation
      • 100% Customer Satisfaction