Industrial acetone (3)

4.

4.

a) Constant temperature water bath: The temperature can be controlled at (25±0.

b) Pipette: 2mL;

c) Colorless and transparent colorimetric tube with stopper: 50mL;

d) Timer: can measure 120min or more intermittent time, with alarm

4.

a) Potassium permanganate solution: 0.

b) Cobalt chloride-platinum-cobalt standard colorimetric solution: Weigh 175mg of chlorinated cobalt (CoCl ₂ ·6H ₂ O), add 21.

c) No.

4.

Inject the test sample into a 50mL colorimetric tube with stopper to exceed the scale, and place it in a constant temperature water bath [temperature control at (25±0.

4.

4.

a) Measuring cylinder with stopper: 250mL;

b) Pipette: 25mL

4.

Distilled water: prepared according to GB/T603

4.

Use a pipette to draw 25mL of the sample into a 250mL graduated cylinder, dilute to the mark with distilled water, and shake well
.
Add 250mL of distilled water to another 250mL graduated cylinder as a standard.
After placing it under ambient conditions for 30 minutes, observe the black background through the liquid column to compare the turbidity of the sample solution and the distilled water
.
If artificial light sources are used, the light is placed in a position where the light passes through the measuring cylinder laterally
.
If the sample has the same turbidity as the distilled water, it is qualified; if the turbidity of the sample is greater than the turbidity of distilled water, it is unqualified
.