This standard specifies the o-phenanthroline spectrophotometric method for the determination of iron content in liquid anhydrous ammonia (liquid ammonia).
1987GB 8570.7-1988 Determination of the content of liquid anhydrous ammonium ferric o-phenanthroline spectrophotometric method
GB 8570.7-1988 Determination of the content of liquid anhydrous ammonium ferric o-phenanthroline spectrophotometric method was changed to GB/T 8570.7-2010 Determination of liquefied anhydrous ammonia.Part 7:Iron content.o-Phenathroline spectrophotometric method.