HG/T 4715-20143,4-Dichloronitrobenzene (English PDF)

4.2 Safety technical specification

According to GB/T 16483, the product shall provide detailed safety technical specifications when leaving the factory. The safety technical specification shall include the following contents:

a) Provide dangerous information of the product;

b) Safe use method;

c) Transportation and storage requirements;

d) Protective measures;

e) Emergency treatment measures, etc.

6.1 General provisions

Unless otherwise specified, only use reagents confirmed to be analytically pure.

The test result is judged according to the rounding-off value comparison method in 4.3.3 of GB/T 8170-2008.

6.2 Appearance evaluation

Use visual evaluation under natural light.

6.3

Determination of purity of 3,4-dichloronitrobenzene and content of organic impurities […]

6.3.5 Measurement procedure

6.3.5.1 Preparation of sample solution

Weigh about 0.5 g (accurate to 0.001 g) of 3,4-Dichloronitrobenzene specimen.

Place it in a 10 mL volumetric flask. Add chloroform to dissolve it. Dilute it to the mark. Close the bottle stopper. Place it in the ultrasonic generator for oscillation to fully dissolve it, which is the sample solution.

6.3.5.2 Determination

Turn on the chromatograph. After the various operating conditions of the instrument are stable, add 1.0 µL of the sample solution. Use the chromatographic workstation or integrator to process the results after the peak is completed.

6.3.6 Result calculation

The purity and organic impurity content of 3,4-dichloronitrobenzene is expressed in wi ; the value is expressed in % and calculated according to formula (1):

Where:

Ai - Peak area of 3,4-Dichloronitrobenzene and various organic impurities;

sigmaAi - The sum of the peak areas of 3,4-Dichloronitrobenzene and each organic impurity.

The calculation result is expressed to 2 decimal places.

6.3.7 Allowance

The absolute difference between the two parallel determinations of the purity of

3,4-Dichloronitrobenzene shall be not more than 0.20%. The absolute difference between the two parallel determinations of the content of each organic impurity shall be not more than 0.05%. Take the arithmetic mean value as the determination result.

6.3.8 Chromatogram

The chromatogram is as shown in Figure 1.

7.2 Exit-factory inspection

3,4-Dichloronitrobenzene shall be inspected and qualified by the quality inspection department of the production plant; the qualified certificate shall be attached before leaving the factory. The manufacturer shall ensure that all 3,4- dichloronitrobenzene delivered out of the factory meet the requirements of this standard.

7.3 Reinspection

If one of the indicators in the inspection result does not meet the requirements of this standard, samples shall be taken from twice the amount of packaging for inspection. Even if only one indicator of the reinspection does not meet the requirements of this standard, the entire batch of products will be unqualified.

8 Markings, labels, packaging, transportation and storage

8.1 Markings

3.4- Each package of 3,4-Dichloronitrobenzene shall be painted with firm and clear hazardous chemical signs and related safety storage and transportation signs in accordance with the relevant requirements of GB 190 and GB/T 191.

The contents of the signs shall at least include:

a) Product name;

b) The name and address of the manufacturer;

c) Production date;

d) Production license number (if applicable) e) Net content;

f) Warning signs (toxic substances).

8.2 Label

The product shall have a label. The label shall indicate the date of production, certificate of conformity, implemented standard number, batch number and grade; meanwhile it shall comply with GB 15258 "General rules for preparation of precautionary label for chemicals".