• ISO 9779:1993

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    Metallurgical-grade fluorspar — Determination of lead content — Solvent extraction atomic absorption spectrometric method

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    Withdrawn date:  14-03-2019

    Language(s):  English, French

    Published date:  01-04-1993

    Publisher:  International Organization for Standardization

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    Abstract - (Show below) - (Hide below)

    The principle of the method specified is to decompose a test portion by a mixture of nitric, hydrofluoric and perchloric acids, dissolving the salts in hydrochloric acid after evaporation to dryness, extracting the lead from a dilute hydrochloric acid solution of the decomposed test portion into a solution of tri-n-octylphosphine oxide in 4-methyl-2-pentanone, aspirating the extract into the air/acetylene flame of an atomic absorption spectrometer, and measuring the absorbance at 283,3 nm. Applies to products having lead contents in the range 0,0006 % (m/m) to 0,01 % (m/m).

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    Committee ISO/TC 175
    Document Type Standard
    Publisher International Organization for Standardization
    Status Withdrawn
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