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ISO 4281:1977
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Sodium hexafluorosilicate for industrial use -- Determination of free acidity and total hexafluorosilicate content -- Titrimetric method

This standard was last reviewed* in 2011.

*ISO standards are reviewed every five years.

Abstract

With respect to the free acidity, applicable to products having contents, expressed as H2 SiF6 , equal to or more than 0,1 % (m/m). First, determination of the free acid contents by titration of an ice-cooled test portion with a standard volumetric sodium hydroxide solution in the presence of potassium nitrate and using bromothymol blue as indicator, then, followed by titration at near boiling temperature with standard volumetric sodium hydroxide solution to the appearance of a permanent blue colour.

 

  • Edition: 1 (Monolingual) ICS: 71.060.50
    Status: Published Stage: 90.93 (2011-10-13)
    TC/SC: ISO/TC 47 Number of Pages: 2
  • No revision information available

  • No corrigenda or amendments available

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