Industrial ethyl acetoacetate (2)

4 Test method

The reagents and water used in this standard, unless other special requirements are indicated, all use analytical reagents and distilled water or water of the same purity

4.

4.

According to the provisions of GB615

4.

Carry out according to GB6283 regulations and draw 5.

4.

The difference between the two parallel determination results is not more than 0.

4.

Add 5 mL of the sample to a 50 mL graduated test tube, and then add 15 mL of ethyl acetate .

4.

4.

4.

4.

4.

4.

Take 100 mL of carbon dioxide- free water, add 5 drops of phenol red indicator solution, neutralize it with a standard hydrochloric acid titration solution to make the solution light red for at least 30 seconds, add 10.
0 mL of the sample, and titrate with sodium hydroxide standard solution until it is light Red, keep for at least 30s, that is the end point
.

4.
5.
3 Presentation of results

The content X of acid (calculated as acetic acid) expressed in mass percentage is calculated as follows:

Where: c— the actual concentration of sodium hydroxide standard titration solution, mol/L;

V—Dosage of sodium hydroxide standard solution used in titration, mL;

p—The density of the sample (1.
020g/cm ³ );

0.
060—The mass of acetic acid expressed in grams, which is equivalent to 1.
00mL sodium hydroxide standard solution Cc(NaOH)=1.
000mol/L] .

4.
5.
4 Allowance

The difference between the two parallel determination results is not more than 0.
05%
.

4.
6 Determination of density

Carry out according to the Webster's balance method in Article 2.
3.
2 of GB4472
.

5 Inspection rules

5.
1 Industrial ethyl acetoacetate should be inspected by the quality inspection department of the manufacturer, and the manufacturer should ensure that the products shipped out of the factory meet the requirements of this standard, and each batch of products shipped out of the factory should have a quality certificate
.
The content includes the name of the manufacturer, the name of the product, the grade, the batch number and the serial number of this standard
.

5.
2 Sampling: Each storage tank of ethyl acetoacetate is a batch number.
Sampling in the packaging barrel shall be carried out in accordance with the provisions of Article 6.
6.
2 of GB6678
.

On the basis of ensuring that the packaging barrels are dry and clean, the manufacturer can sample in the storage tank, but the packaging barrel sampling shall prevail in the arbitration
.

5.
3 After mixing the samples taken, divide them into two clean and dry ground glass bottles, seal them, and label them
.
And indicate the manufacturer name, product name, lot number and so on
.
One bottle is for inspection, and the other bottle is kept for later use.
The storage period is three months
.

5.
4 The user has the right to inspect the quality of the received ethyl acetoacetate in accordance with the provisions of this standard
.

5.
5 The test result is judged according to the rounding value comparison method in GB1250
.
Revision is carried out in accordance with GB8170
.

5.
6 If one item of the inspection result does not meet the requirements of the standard, the manufacturer and user shall take samples from twice the amount of packaging for inspection.
The result of the re-inspection of the product, even if only one item does not meet the requirements of this standard, shall be re-inspected.
The batch of products is unqualified
.

5.
7 When there is a dispute between the supplier and the buyer on the product quality that requires arbitration, the arbitration institution shall be decided by both parties through consultation, and the arbitration shall be conducted in accordance with the test methods specified in this standard
.

6 Marking, packaging, transportation and storage

6.
1 The packaging aluminum drum should clearly indicate the manufacturer's name, product name, grade batch number, registered trademark, net weight and the number of this standard
.

6.
2 industrial ethylacetoacetate applications aluminum drum, the lid should not damage the seal leakage, barrel weighing 200kg, 100kg and the like
.
Packing weight deviation ± 0.
6%
.

6.
3 Industrial ethyl acetoacetate should be stored in a cool, dry place
.
During transportation, prevent rain and sun exposure
.
Load and unload lightly to prevent damage to the aluminum drum
.