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Oxidative decomposition in the heating block with subsequent interference compensation and photometric determination with 2,6-dimethylphenol in sulphuric acid / phosphoric acid mixture.
All organic and inorganic nitrogen containing
substances are oxidised to nitrate in acidic solution. In acidic solution nitrate ions react with
2,6-dimethylphenol to form 4-nitro-2,6-dimethylphenol, which can be evaluated photometrically. |