Chemical pollutants/food detection

National Food Safety Standard - Determination of Nitrite and Nitrate in Food 1 Scope: This standard specifies the method for determining nitrite and nitrate in food. This standard is applicable to the determination of nitrite and nitrate in food. The first method is ion chromatography. The sample is precipitated with protein and removed from fat, and then extracted and purified using corresponding methods. Potassium hydroxide solution is used as the eluent, separated by an anion exchange column, and detected by a conductivity detector or ultraviolet detector. Qualitative analysis based on retention time and quantitative analysis using external standard method. Unless otherwise specified, all reagents and materials used in this method are analytical pure, and the water is the first grade water specified in GB/T 6682

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