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BS 4993-1:1974

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Methods of test for aluminium fluoride for industrial use, Determination of fluorine content

Fusion of a test portion with sodium carbonate and separation of the fluorine by distillation with sulphuric acid. Titration of the distillate with thorium nitrate solution using either sodium alizarinsulphonate with or without methylene blue as masking agents, or methylthymol blue as indicator.

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BS 4993-1:1974

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