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See Chinese contents: GB/T 13085-2018 GB/T 13085-2018: Determination of nitrite in feeds -- Colorimetry method
This Standard specifies the colorimetry method for the determination of nitrite in feeds. This Standard applies to the determination of nitrite in feed raw materials, compound feeds, concentrated feeds and concentrate supplements. The detection limit of this method is 0.70 mg/kg, and the quantitation limit is 2.0 mg/kg.
