Standard

ISO 4280:1977

Aktuell

Bestehende oder zukünftige Amendments und Versionen müssen separat erworben werden.

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Zusammenfassung

Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.

Produktspezifikationen

  • Standard von ISO
  • Ausgabedatum:
  • Edition: 1
  • Dokumenttyp: IS
  • Seiten
  • Herausgeber: ISO
  • Lieferant: ISO
  • ICS: 71.060.50
  • Internationales Komitee: ISO/TC 226