Edible oil parameter detection

1. Liquid specific gravity balance method 1.1 Instruments and tools 1.1.1 Liquid specific gravity balance; 1.1.2 Beaker, pipette, etc. 1.2 Reagents 1.2.1 Washing solution β 1.2.2 Ethanol and ether; 1.2.3 Distilled water without carbon dioxide s1.2.4 Degreasing cotton, filter paper, etc. 1.3 Operation method 1.3.1 Weighing Wenshui: According to the instructions for using the instrument, first calibrate the instrument, hang the No.1 weight on the hook, and inject distilled water into the vector cylinder until the platinum wire on the float is immersed in 1 cm of water. When adjusting the water to 20 ℃, twist the screw on the balance seat to achieve balance. Do not move the balance again. Pour out the water from the measuring cylinder. First, use ethanol, then use ether to remove the water from the float, measuring cylinder, and thermometer, and then wipe dry with a absorbent cotton. 1.3.2 Weigh the sample. Inject the sample within a certain amount until the platinum wire on the float is immersed in the sample for 1cm. When the sample temperature reaches 20 ℃, move and add weights to the balance groove to restore balance. Usage of weights: First, move the No. 1 base on the hook to the groove 9, and then add the No. 2, No. 3, and No. 4 weights to the groove to achieve balance on the balance. 1.4 Result calculation: After the balance reaches equilibrium, calculate the result based on the position of the large and small weights. Weights 1, 2, 3, and 4 have the first, second, third, and fourth decimal places, respectively. For example, when the oil temperature and water temperature are both 20 ℃, the weight 1 is at position 9, the weight 2 is at position 4, the weight 3 is at position 3, and the weight 4 is at position 5, the specific gravity of the grease is 0.9435 when d reaches 8

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