Method for correcting and determining the refractive index of a refractometer
1. Zero adjustment
Take distilled water and place it on the detection prism for reading. If the blue white boundary is not at the zero mark, turn the adjustment screw until the boundary is at the zero mark.
2. Determine the refractive index
Prepare a measuring cup with a certain concentration of the solution to be tested, such as 10%; Read the reading of the refractometer, such as 5%, and the refractive index is 10/5=2.
3. Verify refractive index
Continue to prepare another concentration of the solution to be tested with a measuring cup, such as 6%; Read the refractometer reading, such as 3%, to prove that the refractive index is correct.
Usage:
1. Open the prism, clean the mirror surface with wiping paper, drop a small amount of the liquid to be tested on the mirror surface, and make it cover the entire mirror surface. Close the prism.
2. Adjust the reflector 7 to reach the appropriate position for the incident light, then rotate the prism to make the eyepiece appear half bright and half dark, with the dividing line located at the intersection of the crosshairs. At this point, the refractive index of the liquid can be read on the scale from the magnifying glass 2.
If a colored light band appears, adjust the achromatic compensator to make the colored light band disappear and the light dark interface clear.
After the measurement is completed, open the prism and wash the mirror surface with acetone. Alternatively, use an ear ball to blow dry the mirror surface. After the experiment is completed, in addition to cleaning the mirror surface, it is necessary to clamp two layers of mirror paper to tighten the closing screws of the two prisms to prevent damage to the mirror surface.
