Agricultural product parameters (40) 533854 detection

This standard specifies the inductively coupled plasma mass spectrometry (ICP-MS) and inductively coupled plasma emission spectrometry (ICP-OES) for the determination of multiple elements in food. The first method is applicable to the determination of boron, sodium, magnesium, aluminum, potassium, calcium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, selenium, strontium, molybdenum, cadmium, tin, antimony, barium, mercury, lump, and lead in food; The second method is applicable to the determination of aluminum, boron, barium, calcium, copper, iron, potassium, magnesium, manganese, sodium, nickel, phosphorus, strontium, titanium, vanadium, and zinc in food. The first method is Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The sample is digested and determined by an Inductively Coupled Plasma Mass Spectrometer. The specific mass number (mass charge ratio, m/z) of the element is used for qualitative analysis. The external standard method is used, and the intensity ratio of the mass spectrometry signal of the element to be measured and the internal standard element mass spectrometry signal is directly proportional to the concentration of the element to be measured for quantitative analysis. Unless otherwise specified, all reagents and materials used in this method are 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): High purity or higher. 3.1.2 Argon (Ar): Argon (≥ 99.995%) or liquid argon. 3.1.3 Helium (He): Helium (≥ 99.995%). 3.1.4 Gold element (Au) solution (100o mg/L). 3.2 Reagent Preparation 3.2.1 Nitric Acid Solution (5+95): Take 50 mL of nitric acid, slowly add it to 950 mL of water, and mix well. 3.2.2 Mercury standard stabilizer; Dilute 2 mL of gold element (Au solution) with nitric acid solution (5+95) to 1000 mL for the preparation of mercury standard solution. Note that the standard stabilizer for mercury can also be a mixed solution of 2 g/L cysteine hydrochloride and nitric acid (5+95), or other equivalent stabilizers

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