Determination of volatile matter in calcium carbonate - 105℃ by drying oven

1 Scope

This method is suitable for the determination of volatile matter in calcium carbonate at 105℃ of mass fraction>0.5%.

2 Principle 

Under the condition of drying temperature of 105±5℃, the ratio of quality difference between material before and after drying and raw material is calculated, that is, the amount of volatile matter under 105℃.

3 Steps

3.1 Sample

Weighing about 2g samples, accurate to 0.0002 g.

3.2 Blank test

Do blank experiment with the test material.

3.3 Dry constant weight

Place the test material in a weighing bottle of constant weight at 105±5℃, move into a drying oven TG-9075A,  Dry to constant weight under 105±5℃.

4 Fruiting Calculation

According to the following formula, the content of volatile matter at 105℃ is calculated, expressed as mass fraction:

Formula :-105℃ volatile mass fraction,%;

- Quality of weighing bottles and test samples before drying: g;

- Quality of weighing bottles and test samples after drying: g;

- Quality and test samples: g;

5 Tolerance (cited in GB/T 19281-2003)

The difference between the two values is not greater than 0.04.

6 References

GB/T 19281-2003

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