Food and health food (additives) testing

This standard specifies a method for rapid detection of melamine in raw milk by liquid chromatography. This standard applies to raw milk and also to liquid dairy products without additives. The quantitative detection range of this standard is 0 30 mg/kg~100.0 mg/kg, with a detection limit of 0 05 mg/kg. Note: When the content of melamine in raw milk exceeds 100 At 0 mg/kg, the specific operation method can be found in 6.2.2.3.2.2 Normative References. The clauses in the following documents have become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version is applicable to this standard. GB/T 6379 Accuracy (accuracy and precision) of measurement methods and results - Part 1: General principles and definitions (GB/T 6379) 1-2004, ISO 5725-1:1994, IDT) GB/T 6379.2 Accuracy (Accuracy and Precision) of Measurement Methods and Results Part 2: Basic Method for Determining the Repeatability and Reproducibility of Standard Measurement Methods (GB/T 6379 2--2004, ISO 5725-2:1994, IDT)

GB/T 6682 Specification and Test Methods for Analytical Laboratory Water (GB/T 6682--2008, ISO 3696:1987, MOD) 3 Principle: Acetonitrile is used as a protein precipitant and melamine extractant in raw milk, strong cation exchange chromatography column separation, high-performance liquid chromatography ultraviolet detector or diode array detector detection, and external standard method quantification. Unless otherwise specified, all reagents and materials used are analytical grade or above, and the water is Grade 1 water as specified in GB/T 6682. 4.1 Acetonitrile (CH, CN): Chromatically pure. 4.2 Phosphoric acid (H, PO,). 4.3 Potassium dihydrogen phosphate (KH, PO,). 4.4 Melamine standard substance (C, H.N,): purity greater than or equal to 99%. 4.5 Melamine standard stock solution (1.00X10 * mg/L): Weigh 100 mg (accurate to 0.1 mg) of melamine standard substance, completely dissolve it in water, dilute it to the mark in a 100 mL volumetric flask, mix well, and store in dark at 4 ° C, with an expiration date of 1 month. 4.6 Standard working solution: prepared during use. 4.6.1 Standard Solution A (2.00X10 * mg/L): Accurately transfer 20.0mL of melamine standard stock solution (4.5), place it in a 100mL volumetric flask, dilute with water to the mark, and mix well. 4.6.2 Standard solution B (0.50 mg/L): Accurately transfer 0 25 mL of standard solution A (4.6.1), place in a 100 mL volumetric flask, dilute with water to the mark, and mix well. 4.6.3 According to Table 1, transfer different volumes of standard solution A (4.6.1) into volumetric flasks, dilute with water to the mark, and mix well. According to Table 2, transfer different volumes of standard solution B (4.6.2) into volumetric flasks, dilute with water to the mark, and mix well

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