Milk powder parameter detection

This standard specifies the method for determining moisture in food. The direct drying method in this standard is applicable to the determination of moisture in grains and their products, aquatic products, bean products, dairy products, meat products, and pickled vegetable products that do not contain or have very little other volatile substances at 10l ℃~105 ℃. It is not applicable to samples with a moisture content less than 0.5 g/100 g. The vacuum drying method is applicable to the determination of moisture in easily decomposable foods such as sugar and monosodium glutamate. It is not suitable for the determination of candies with other raw materials added, such as milk sugar and soft candy samples. At the same time, this method is not applicable to samples with moisture content less than 0.5 g/100 g. The distillation method is suitable for the determination of moisture in foods containing high volatile substances such as oils, spices, etc. It is not suitable for samples with a moisture content less than lg/100 g. The Karl Fischer method is suitable for the determination of moisture in food, the Karl Fischer volumetric method is suitable for samples with a moisture content greater than 1.0x10 * g/100 g, and the Karl Fischer Coulomb method is suitable for samples with a moisture content greater than 1.0x105 g/100 g. Using the physical properties of water in food, the evaporation method is used to determine the weight loss during drying of the sample at 101.3 kPa (one atmospheric pressure) and a temperature of 101 ℃~105 ℃, including hygroscopic water, some crystalline water, and substances that can be volatilized under this condition. The moisture content is then calculated using the weighing values before and after drying. Unless otherwise specified, all reagents used in this method are analytical pure. 3.1 Hydrochloric acid: premium grade pure. 3.2 Sodium hydroxide (NaOH): premium grade pure. 3.3 Hydrochloric acid solution (6 mol/L): Measure 50 mL of hydrochloric acid and dilute to 100 mL with water. 3.4 Sodium hydroxide solution (6mol/L): Weigh 24g of sodium hydroxide, dissolve in water, and dilute to 100 mL. 3.5 Sea sand: Take sea sand or river sand that has been washed with water to remove soil. First, boil it with hydrochloric acid (3.3) for 0.5 hours, wash it with water until neutral, then boil it with sodium hydroxide solution (3.4) for 0.5 hours, wash it with water until neutral, and dry it at 105 ℃ for later use. 4 Instruments and Equipment 4.1 Flat aluminum or glass weighing bottles. 4.2 Electric heating constant temperature drying oven

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