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Hlavní stránka>ISO 4280:1977-Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method
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sklademVydáno: 1977
ISO 4280:1977-Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

ISO 4280:1977

ISO 4280:1977-Cryolite, natural and artificial, and aluminium fluoride for industrial use — Determination of sulphate content — Barium sulphate gravimetric method

Formát
Dostupnost
Cena a měna
Anglicky PDF
K okamžitému stažení
1200 Kč
Francouzsky PDF
K okamžitému stažení
1200 Kč
Anglicky Tisk
Skladem
1200 Kč
Francouzsky Tisk
Skladem
1200 Kč
Označení normy:ISO 4280:1977
Počet stran:3
Vydání:1
Vydáno:1977
Popis

ISO 4280:1977


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.
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