Industrial Sebacic Acid (2)

4 Test method

In the analytical method, except for special regulations, only analytical reagents and distilled water or water of the same purity should be used; reference materials should be reference reagents

The preparation method of the standard solution adopts the method specified in GB601 and GB603

4.

4.

4.

4.

4.

4.

4.

Weigh 1.

4.

The mass percentage of sebacic acid is calculated according to formula (1):

In the formula: X—mass white content of sebacic acid, %;

c—The actual concentration of sodium hydroxide standard titration solution, mol/L;

V— Volume of sodium hydroxide standard titration solution consumed in titration, mL;

0.

m—the mass of the sample, g

4.

The difference between the results of the two test samples in parallel shall not be greater than 0.

4.
2 Determination of ash

Measure according to GB7531
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The sample weight is about 5g (accurate to 0.
01g), and the burning temperature is 750±25℃
.

4.
3 Determination of moisture

Measure according to GB6284
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The weighing amount is about 5g (accurate to 0.
0002g)
.

4.
4 Determination of alkali-soluble color

4.
4.
1 Apparatus

According to the provisions of GB3143
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4.
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2 Reagents and solutions

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4.
2.
1 According to the reagents and solutions specified in GB3143
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2.
2 Potassium hydroxide solution: 100g/L
.

4.
4.
3 Analysis steps

Weigh 3g of the sample (accurate to 0.
1g), place it in a 50mL colorimetric tube, add potassium hydroxide solution (4.
4.
2.
2) to the mark, shake the colorimetric tube, wait for the sample to dissolve, and place it in a well-lit place Standard color scale for color comparison
.

4.
4.
4 Allowance

The difference between the results of parallel determination of two samples shall not be greater than No.
5, and the arithmetic average of the two determination results shall be taken as the determination result
.

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