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A2 Chromaticity measurement
A2.
Put the sample into the colorimetric tube, and then compare the color with the Hazen standard solution
A2.
Colorimetric tube: a flat-bottomed glass tube with an inner diameter of about 23mm of the same quality and same diameter with a glass stopper.
A2.
a) Hazen standard solution: 1.
b) A series of comparison solution, which is equivalent to the standard solution of color number 500 diluted and prepared according to the ratio of Table A1;
Table A1 Hazen series comparison solution
c) Take 100 mL of the series of comparison solutions and place them in a colorimetric tube, and store them in a dark place.
A2.
Put the colorimetric tube into which the sample in 5.