Industrial Melamine (Appendix A One)

Appendix A

(Standard appendix)

Determination of Turbidity and Color in Formaldehyde Water Dissolution Test

A1 Turbidity measurement

A1.

The turbidity value is measured by visually observing the turbidity of the sample and comparing it with the kaolin standard liquid phase

Measuring range: 1-10 degrees (kaolin)

A1.

a) Water; the used distilled water is filtered with a filter with a pore size of about 0.

b) Refined kaolin: Take about 10g of kaolin (kaolin) in a 500mL beaker, add 300mL of water, and then add 0.

Use a centrifuge of about 3000 r/min for about 20 minutes of centrifugal separation for the taken solution, or filter with a filter material with a pore size of 1 um or less, and then heat the filtered kaolin at 105-110°C for 3 hours, and place it in a desiccator.

c) Kaolin standard solution [1000 degrees (kaolin)]: After dispersing 1.

d) Kaolin standard solution [100 degrees (kaolin)]: After vigorously shaking the kaolin standard solution [1000 degrees (kaolin)], immediately add 100 mL of the solution to a 1000 mL volumetric flask, and add water to the mark

A1.

a) Dark box: If the dark box shown in Figure 1 is used, it will be easier to compare the turbidity with the naked eye

b) Colorimetric tube: 100mL graduated colorimetric tube with flat bottom with plug

A1.

a) Kaolin comparison solution for turbidity [1～10 degrees (kaolin)": Shake 100 degrees (kaolin) turbidity solution, and draw 5～30mL into the colorimetric tube, add water to the 100mL mark;

b) Take an appropriate amount of the sample dissolved in 5.

A1.

Calculate the turbidity [degree (kaolin)] of the sample according to formula A1 by comparing the liquid turbidity [degree (kaolin)] of the kaolin that meets the turbidity of the sample

In the formula: T-sample turbidity [degree (kaolin)];

Ts—The turbidity of the kaolin corresponding to the turbidity of the sample [degree (kaolin)];

V—The volume of the sample, mL
.

Figure A1 Camera Obscura

Figure A2 Colorimetric tube

Related Links: Industrial Melamine (5)