Routine physicochemical parameter testing of agricultural products

This standard specifies the determination method for 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. 3.1 Reagent 3.1.1 Acetic acid (CH, COOH). 3.1.2 Potassium hydroxide (KOH). 3.2 Reagent Preparation 3.2.1 Acetic Acid Solution (3%): Measure 3 mL of acetic acid into a 100 mL volumetric flask, dilute with water to the mark, and mix well. 3.2.2: Potassium hydroxide solution (1 mol/L): Weigh 6 g of potassium hydroxide, dissolve in freshly boiled cold water, dilute to 100 mL, and mix well. 3.3 Standard substance 3.3.1 Sodium nitrite (NaNOp, CAS No. 7632-00-0): Reference reagent, or nitrite standard solution with a standard substance certificate. 3.3.2 Sodium nitrate (NaNO, CAS No. 7631-99-4); Reference reagents, or nitrate standard solutions with standard substance certificates

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