Industrial 1,1,1,2-Tetrafluoroethane (HFC-134a) (4)

4.

Carry out in accordance with the provisions of 2.

Take the arithmetic average of the two parallel determination results as the determination result, and the difference between the two parallel determination results shall not exceed 0.

4.

4.

Using gas chromatography, under the selected working conditions, make the non-condensable gas (NCG) of the vapor towel above the refrigerant liquid phase pass through the packed chromatographic column, detect with the thermal conductivity detector (TCD), and calculate the non-condensable gas by the external standard method The content of sexual gas

Among the typical refrigerant samples, air is the only NCG with an exact amount, and other air samples are not used for routine analysis

4.

4.

4.

4.

4.

4.

4.

4.

Before using the chromatographic column, pass carrier gas (nitrogen) according to the conditions shown in Table 3 for aging

4.
6.
3.
3 Injector: injection valve;

4.
6.
3.
4 Chromatographic data processor;

4.
63.
5 Thermometer: -20℃～50℃, 0.
2℃:

4.
6.
3.
6 Sampling cylinder: same as 4.
2.
3.
4
.

4.
6.
4 Chromatographic analysis conditions

The recommended chromatographic operating conditions are shown in Table 3
.
For typical chromatograms and retention times, see Figure Bl and Table B1 in Appendix B (standard appendix)
.
Other chromatographic operating conditions that can achieve the same degree of separation can be used
.

Table 3 Recommended chromatographic operating conditions