ISO 3331:1975

Ammonium nitrate for industrial use — Determination of total nitrogen content — Titrimetric method after distillation ISO 3331:1975

Publication date:   Jul 1, 1975

95.99 Withdrawal of Standard   May 27, 2002

General information

95.99 Withdrawal of Standard   May 27, 2002

ISO

ISO/TC 47 Chemistry

International Standard

71.060.50   Salts

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Scope

Based on the conversion of nitrate into ammonia by means of Devarda's alloy in alkaline solution together with the liberation of ammonia from ammonium ions. Distillation of the ammonia from both reactions, absorption in an excess of standard volumetric sodium hydroxide solution in the presence of methyl red/methylene blue mixed indicator. A typical distillation apparatus is shown in a figure.

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WITHDRAWN
ISO 3331:1975
95.99 Withdrawal of Standard
May 27, 2002