ISO 7990:1985
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Manganese ores and concentrates -- Determination of total iron content -- Titrimetric method after reduction and sulfosalicylic acid spectrophotometric method

This standard was last reviewed and confirmed* in 2016.

*Therefore this version remains current


Method A is applicable to products having a total iron content from 1 to 25 % (m/m), and method B is applicable to products having a total iron content from 0.2 to 2 % (m/m). ISO 7990 should be read in conjunction with ISO 4297. Specifies principle, reactions (method A only), reagents, apparatus, sampling and samples, procedure and expression of results.


  • Document published on: 1985-12-12
    Edition: 1 (Monolingual) ICS: 73.060.20
    Status: Published Stage: 90.93 (2016-02-23)
    TC/SC: ISO/TC 132 Number of Pages: 6
  • Revises: ISO/R 313:1963

  • No corrigenda or amendments available

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