Food and health food (heavy metal) testing

This part of GB/T 13025 specifies the method for determining lead in salt products. This section is applicable to the determination of lead in salt products. 2 Normative References The following documents are essential for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modifications) applies to this document. GB/T6682-2008 Specification and Test Methods for Analytical Laboratory Water -3 Hydride Atomic Fluorescence Photometric Method 3.1 Principle: Under acidic conditions, lead in the sample reacts with sodium borohydride to form a volatile hydride of lead (PbH,), which is carried by the carrier gas into a quartz atomizer and decomposed into atomic lead. Under the irradiation of a specially designed lead hollow cathode lamp, the ground state lead atom is excited to a high energy state, and upon deactivation and returning to the ground state, fluorescence of the characteristic wavelength is emitted, Its fluorescence intensity is directly proportional to the lead content under fixed conditions, and is quantitatively compared to the standard series. 3.2 Reagents 3.2.1 Reagent specifications Unless otherwise specified, only reagents confirmed as analytical pure and secondary water specified in GB/T 6682-2008 shall be used in the analysis. 3.2.2 Sodium borohydride solution (15 g/L) Weigh 3.00 g of sodium borohydride and 1.00 g of sodium hydroxide, dissolve them in 200 mL of water, and prepare new solutions when used. 3.2.3 Hydrochloric acid solution (1+1) Take 250 mL of concentrated hydrochloric acid and dissolve it in 250 mL of water. 3.2.4 Potassium ferrocyanide solution (10.0 g of potassium ferrocyanide is weighed at 100 g/L, dissolved in water and diluted to 100 mL. 3.2.5 Oxalic acid solution (20 g/L) is weighed at 2.0 g of oxalic acid, dissolved in water and diluted to 100 mL. 3.2.6 Hydrochloric acid solution (2+98) Take 10.0 mL of concentrated hydrochloric acid and dissolve it in 490 mL of water. This solution is the carrier liquid

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