Determine the Sample Mass
Sample Data Worksheet for Gas Adsorption
The equipment images in this topic may differ slightly from your equipment; however, the instructions are the same unless otherwise noted. |
Clean, dry sample tubes are essential for accurate results. How much sample to use can be determined best by experiment. In general, a sample providing 40 to 120 square meters of total surface area is recommended for nitrogen analysis. Less than 40 square meters may cause unreliable results. More than 120 square meters will extend analysis time.
Smaller quantities are required for samples having high surface areas. These samples require careful weighing after degassing because a small error may represent a considerable percent of total weight. Proper weighing techniques are most important in this case. Use no less than 100 mg to reduce the effect of weighing errors.
Care should be taken when loading powders: the accessory funnel is useful for this purpose. Large granules or chunks may be loaded with forceps.
Analysis results are expressed in units of surface area per gram of sample; therefore, it is important to know the true sample mass.
Follow the instructions on the Sample Data Worksheet and complete all fields to find the true sample mass.
- Record the sample tube identification on the Sample Data Worksheet.
- Place the sample weighing support on the balance. Tare the balance and allow it to stabilize at zero (0).
- Place the empty sample tube set (empty sample tube and stopper) on the sample weighing support and place it on the balance.
- Record the stabilized mass on the Sample Data Worksheet . Remove the sample tube set from the balance.
Do not touch the sample with bare hands while performing the following steps. Doing so could affect the accuracy of results. |
- Place a sample container on the balance. Tare the balance and allow it to stabilize to zero.
- Slowly pour the specified amount of sample into the sample container.
- Remove either the rubber stopper from the sample tube.
- Use the sample tube funnel (provided in the accessories kit) and pour the sample from the weighing container into the sample tube.
- Replace the rubber stopper.
- On the Sample Data Worksheet, record the following:
- Mass of the sample tube set with the sample.
- Subtract the Mass of empty sample tube set from the Mass of sample tube set plus sample.
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