Canned refrigerated crab meat testing

The first part of this standard specifies the method for determining total mercury in food. The first part of this standard is applicable to the determination of total demand in food. The second part of this standard specifies the liquid chromatography-atomic fluorescence spectrometry (LC-AFS) method for the determination of methylmercury content in food. The second part of this standard is applicable to the determination of methylmercury content in food. After the sample is digested by acid heating, in an acidic medium, the mercury in the sample is reduced to atomic state mercury by potassium borohydride or sodium borohydride. The carrier gas (argon gas) is carried into the atomizer, and under the irradiation of a mercury hollow cathode lamp, the ground state mercury atom is excited to the commercial energy state, and when it returns to the ground state from the high-energy state. Emit fluorescence with characteristic wavelengths, whose fluorescence intensity is proportional to the calculated content, and is quantitatively compared to the standard series solution. 3 Reagents and Materials Note: Unless otherwise specified, the reagents used in this method are all high-grade pure, and the water is the first grade water specified in GB/T 6682. 3.1 Reagent 3.1.1 Nitric acid (HNO). 3.1.2 Hydrogen peroxide (H2O2). 3.1.3 Sulfuric acid (H2SO,). 3.1.4 Potassium hydroxide (KOH). 3.1.5 Potassium borohydride (KBH): analytically pure. 3.2 Reagent Preparation 3.2.1 Nitric Acid Solution (1+9): Measure 50 mI of nitric acid and slowly add it to 450 mI of water. 3.2.2 Nitric acid solution (5+95): Measure 5 mL of nitric acid and slowly add it to 95 mL of water. 3.2.3 Potassium hydroxide solution (5 g/L); Weigh 5.0g of potassium hydroxide, dissolve in pure water and bring to a constant volume of 1000 mL, and mix well. 3.2.4 Potassium borohydride solution (5 g/L): Weigh 5.0g of potassium borohydride, dissolve it in a 5 g/L potassium hydroxide solution, bring to volume to 1000 mL, and mix well. Ready to use and ready to use. 3.2.5 Potassium dichromate nitric acid solution (0.5 g/L): Weigh 0.05 g of potassium dichromate and dissolve it in 100 mL of nitric acid solution (5+95). 3.2.6 Nitric acid perchloric acid mixed solution (5+1): Measure 500mL of nitric acid and 100mL of perchloric acid, and mix well

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