ASTM E258-07 Method Total Nitrogen in Organic Materials by Modified Kjeldahl Method

ASTM E258-07 Method Total Nitrogen in Organic Materials by Modified Kjeldahl Method

The ASTM E258-07 test method determines the total nitrogen content of certain unknown organic compounds. The ASTM E258-07 test method performs on organic materials in which the complete conversion of nitrogen to ammonium sulfate takes place. Kjeldahl digestion flask apparatus is used in this test method.

    Scope:

    ASTM E258-07 test method covers the determination of total nitrogen in nitrogen-containing organic compounds. Materials containing N-O, N-N linkages are not applicable for this test method.

    Test Procedure:
    In ASTM E258-07 test method, the sample is digested in a mixture of concentrated sulfuric acid, potassium sulfate, and mercuric oxide. The organic material is oxidized and the nitrogen is converted to ammonium sulfate. Sodium sulfide is added to the digested mixture to precipitate the mercury after which the solution is made strongly alkaline with sodium hydroxide solution. The ammonia which is liberated is distilled into a measured volume of standard acid. The amount of acid neutralized by the ammonia is determined by titrating the excess acid with a standard sodium hydroxide solution.

    Specimen size:

    0.0001 g of Organic Material (contain 14 to 56 mg of nitrogen)

    Data:

    Calculate the nitrogen content as follows:

    Nitrogen, % = {[(A – B) N × 0.01401]/C} × 100

    Where:

    A = standard NaOH solution required for titration of the blank, mL,

    B = standard NaOH solution required for titration of the sample, mL,

    N = normality of the NaOH solution, meq/mL

    C = sample used, g, and

    0.01401 = meq weight of nitrogen.

    mL= millilitre, meq/mL= milliequivalents/millilitre, g = grams, mg = milligram 

    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

      Send us a request

        Process for testing
        •  

          STEP 01

          You share material and testing requirements with us

        •  

          STEP 02

          We ensure your sample pick-up in an ensured manner

        •  

          STEP 03

          We deliver test report to your inbox

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            ddd

            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?