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ISO 7109:1985
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ISO 7109:1985 Ammonia solution for industrial use -- Determination of residue after evaporation at 105 degrees C -- Gravimetric method
standard by International Organization for Standardization, 06/01/1985
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A test portion is evaporated in a tared platinum dish and the residue is weighed after drying at 105 2 C. The method is applicable to solutions containing not more than 35 % (m/m) ammonia.