Standard GB/T3521-95 (2)

3 Volatile matter determination method

3.1 Box-type high-temperature furnace method

3.1.1 Method summary

The sample is heated at high temperature to decompose and escape the volatile substances, and the ignition loss is the volatile matter.

3.1.2 Instruments and materials

3.1.2.1 Balance: Sensitivity 0.1mg.

3.1.2.2 Box-type high-temperature furnace: the maximum temperature is not less than 1000°C.

3.1.2.3 Porcelain crucible with double cover.

3.1.2.4 Crucible rack: The material is stainless steel wire mesh.

3.1.3 Analysis Steps

Accurately weigh 2g of the sample, and evenly place it on the bottom of the double-covered porcelain crucible with constant weight. Place the crucible on the crucible rack, cover the double-cover, and place it in a box-type high-temperature furnace. Close the furnace door. Burn at 400℃ for 1h. The time starts when the crucible is put into the furnace.

After burning, quickly take out the crucible to cool for 1~2min, then move it into a desiccator to cool to room temperature, and weigh.

3.1.4 Result calculation

The percent volatile content is calculated according to formula (2):

     m-m1

x2=────×100……………………(2)

      m

In the formula: x2──Percent volatile content, %;

m──The mass of the dried sample before burning, g;

m1──The mass of the sample after ignition, g. 

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