ASTM  E815−11 Determination of Calcium Fluoride in Fluorspar by Complexometric Titrimetry

ASTM  E815−11 Determination of Calcium Fluoride in Fluorspar by Complexometric Titrimetry

The determination of calcium fluoride in acid-grade fluorspar and other types of fluorspar that can be rendered soluble using the process indicated in the test method is covered in ASTM E815 – 11. The values expressed in SI units are regarded as standard.

    Scope:

    Fluorspar is used as a flux in the steel and glass industries, as well as in the production of hydrofluoric acid. ASTM E815 – 11 is used to ensure that calcium fluoride content meets compositional criteria. All users of these techniques are expected to be qualified analysts capable of performing common laboratory procedures competently and safely. 

    Procedure

    The fluorine is released by fuming after the sample is destroyed with nitric and perchloric acids. The calcium is titrated with standard EDTA solution after the residue is dissolved in dilute hydrochloric acid and the solution is made alkaline. After extracting the former with dilute acetic acid, calcium present as carbonate is measured in a separate sample using EDTA solution.

    Specimen size

    Milligrams of calcium (X) in the 50-mL volume 

    Titration (in millilitres) by 2C sample.

    Data

                Total calcium, % T=10VC/ab

    Where

    V = volume of titrant, mL,

    C = calcium equivalent of EDTA solution, mg/mL,

    a = milliliters of aliquot,

    b = grams of sample used, 

    T = total calcium present

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