ASTM E278-01 Test Method for Determination of Phosphorus in Iron Ores by Phosphomolybdate Coprecipitation and Nitric Acid Titrimetry

ASTM E278-01 Test Method for Determination of Phosphorus in Iron Ores by Phosphomolybdate Coprecipitation and Nitric Acid Titrimetry

ASTM E278-01 Test Method provides a measure to determine the phosphorus in iron ores by using Phosphomolybdate Coprecipitation and Nitric Acid Titrimetry.

    Scope:

    ASTM E278-01 Test Method covers the determination of phosphorus in iron ores, concentrates, and agglomerates. The phosphorus is measured from the range ( 0.01 % to 1.00 %).

    Test Procedure:

    In ASTM E278-01 test method, the sample is dissolved in HCl and HNO3. After the addition of HClO4, the solution is evaporated to strong fumes to dehydrate the silica. The insoluble residue is filtered off, ignited, and treated for the recovery of any contained phosphorus. Ammonium molybdate is added to precipitate phosphomolybdate. The precipitate is filtered off and washed free from acid. It is then dissolved in excess of standard sodium hydroxide solution. The excess sodium hydroxide is titrated with a standard solution of HNO3 using phenolphthalein as an indicator.

    C:\Users\priyanka\Desktop\figure 01.JPG

    Figure 1: Titration Setup (Source: chem.libretexts.org)

    Specimen size:

    A pulverized Iron ore sample weight ±25 mg

    Data:

    Calculate the percent of phosphorus as follows:

    Where:

    A = standard NaOH solution used, mL,

    B = standard HNO3 required for titration of the excess of NaOH in the test sample, mL, 

    C = standard NaOH solution equivalent to 1 mL of the standard HNO3, mL, 

    D = standard NaOH solution required for blank determination, mL,

    E = standard HNO3 required for titration of the excess NaOH in blank determination, mL, 

    F = phosphorus equivalent of the standard NaOH solution, g/mL, and

    G = weight of test sample used

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