γ- Aminobutyric acid detection

The first calculation of this standard specifies the method for determining total arsenic in food. The second part of this standard specifies the determination of inorganic arsenic content in food by liquid chromatography atomic fluorescence spectrometry and liquid chromatography inductively coupled plasma mass spectrometry. The first method, second method, and third method in the first part of this standard are applicable to the determination of total arsenic in various foods. The second part is applicable to the determination of inorganic arsenic (including arsenate and arsenite) content in rice, aquatic animals, cereal auxiliary foods for infants and young children, and canned auxiliary foods for infants and young children. The first part is the determination of total arsenic. The sample crystal is treated with acid digestion to form a sample solution. The sample solution is atomized and sent into an ICP torch tube by carrier gas. It undergoes processes such as Yanfa, dissociation, atomization, and ionization, and is converted into charged ions. It is then collected by an ion collection system and entered into a mass spectrometer. The mass spectrometry only separates according to the mass charge ratio. For a certain mass to charge ratio, the signal strength of mass spectrometry is directly proportional to the number of ions entering the mass spectrometer. That is, the sample concentration is directly proportional to the signal strength of mass spectrometry. Determine the arsenic element in the sample solution by measuring the signal intensity of mass spectrometry. 3 Reagents and Materials Note: Unless otherwise specified, the reagents used in this method are all high-grade pure. The water is the first grade water specified in GB/T 6682. 3.1 Reagent 3.1.1 Nitric acid (HNO): MOS grade (high purity chemicals for electronic industry), BV (I) grade. 3.1.2 Hydrogen peroxide (H2O2). 3.1.3 Mass spectrometry tuning solution: Li.Y. Ce. Ti. Co. Recommended concentration: 10 ng/mL. 3.1.4 Internal standard stock solution: Ge, concentration: 100ug/mL. 3.1.5 Sodium hydroxide (NaOH). 3.2 Reagent Preparation 3.2.1 Nitric Acid Solution (2+98): Measure 20 mL of nitric acid, slowly pour it into 980 mL of water, and mix well. 3.2.2 Internal standard solution Ge or Y (1.0 ug/mL): Take 1.0 mI of internal standard solution. Dilute with nitric acid solution (2+98) and bring to volume 100 mL. 3.2.3 Sodium hydroxide solution (100 g/L): Weigh 10.0g of sodium argon oxide, dissolve with water and bring to volume 100 mL

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