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See Chinese contents: GB/T 609-2018 GB/T 609-2018: Chemical reagent -- General method for the determination of total nitrogen
This Standard specifies a general method for the determination of total amount of trace inorganic nitrogen compounds by Nessler reagent colorimetric method and salicylic acid-hypochlorite colorimetric method. This Standard is applicable to the determination of the total amount of trace inorganic nitrogen compounds (including nitrates, nitrites and ammonium salts) in the chemical reagents. The detection range of Nessler reagent visual colorimetric method and spectrophotometry is 0.05 ~ 0.8 (in terms of N); while the detection range of salicylic acid-hypochlorite visual colorimetric method and spectrophotometry is 0.04 ~ 1 (in terms of N).
