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See Chinese contents: SH/T 1499.3-1997 SH/T 1499.3-1997: Pure adipoic acid. Measurement of ammonia solution colour (in Pt -- Co scale). Spectrophotometric method
This standard specifies the determination method for the solution color of the pure adipic acid ammonium solution. This standard is applicable to the determination of the solution color of the pure adipic acid ammonium solution.
