Element index detection

This standard specifies the detection methods for sodium chloride, lead, total arsenic, cadmium, total mercury, barium, potassium chloride, potassium ferrocyanide, and iodine in table salt. This standard is applicable to the determination of salt indicators. 2. Determination of sodium chloride 2.1 Determination of moisture follows the direct drying method in GB 5009.3, with the drying temperature set at 140 ℃± 2 ℃. Dry until the difference in mass between the two times does not exceed 5 mg, which is considered constant weight. 2.2 Determination of fluoride ions 2.2.1 Principle: After the sample is dissolved, use potassium chromate as an indicator and titrate with silver nitrate standard titration solution to determine the content of chloride ions. 2.2.2 Reagents and Materials Unless otherwise specified, all reagents used in this method are analytical pure, and the water is Grade III water according to GB/T6682. 2.2.2.1 Reagent 2.2.2.1.1: Silver nitrate. 2.2.2.1.2 Potassium ronate. 2.2.2.2 Preparation of reagents 2.2.2.2.1 Silver nitrate standard titration solution (0.1 mol/L). 2.2.2.2.2: Potassium chromate indicator; Weigh 10 g of potassium chromate and dissolve it in 100 mL of water. Stir and add silver nitrate solution dropwise until a reddish brown precipitate appears. Filter. 2.2.3 Instruments and equipment 2.2.3.1 Balances; Sensitivity 0.1 mg. 2.2.3.2 Water bath pot

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