GB/T 4701.8-2009Ferrovanadium - Determination of carbon content - The infrared absorption method (English PDF)

4.1

acetone, carbon residue after evaporation was less than 0.0005%.

4.2

Magnesium perchlorate anhydrous, granular.

4.3

asbestos caustic soda, granular.

4.4

glass wool.

4.5

tungsten particles, the amount of carbon is less than 0.002%, particle size of 0.8mm ~ 1.4mm.

4.6

tin particles, carbon content less than 0.002%, particle size 0.4mm ~ 0.8mm. When necessary, clean the surface with acetone, and dried at room temperature.

4.7

oxygen purity of more than 99.95%, if other levels of oxygen to obtain a low and consistent blank, can also be used.

4.8

Dynamic air, nitrogen or compressed air, which contaminants (oil and water) content of less than 0.5%.

4.9 porcelain crucible, diameter × height

23mm × 23mm or 25mm × 25mm, and fired at a high temperature above 1200 °C furnace

4h or through an oxygen burning to white is lowest.

5.1

Dingtan infrared absorption instrument (sensitivity of 0.1 × 10-6), which means as shown in Figure 1.

5.1.1

washing bottle, the contents of caustic soda asbestos (4.3).

5.1.2

drying tube, built magnesium perchlorate (4.2).

5.2 gas source

5.2.1

The carrier gas container system comprising oxygen, two pressure regulators and ensure the provision of appropriate timing control section and pressure rated flow.

5.2.2

power source system includes a gas powered gas (nitrogen or air) two-stage pressure regulator and ensure the provision of appropriate pressure and rated flow

The timing control section.