Determination of moisture content of Ammonium Metatungstate can usually be done by various methods, the following is a commonly used method of loss on drying, which is based on measuring the difference in mass of the sample before and after drying to determine the moisture content.
- Preparation stage
Sample Preparation
Obtain a representative sample from the ammonium metatungstate product, make sure the sample is well mixed and not contaminated.
Instrument preparation
Prepare a drying oven (constant temperature oven) to ensure that it can provide a constant temperature (e.g., 105°C ± 2°C) and an accurate electronic balance for measuring the mass of the sample.
- Measurement Procedure
Weighing the container
First, use the electronic balance to weigh the mass of a clean, dry container (e.g., a weighing bottle), noted as m0.
Weigh the sample.
Then, place an appropriate amount of ammonium metatungstate sample in the container and record the total mass of the sample and container, noted as m1.
Drying process
The container containing the sample is placed in a drying oven at a pre-set temperature for drying treatment. The drying time is usually 1-2 hours to ensure that the water in the sample is completely evaporated.
Cooling and weighing
Remove the dried container and cool it to room temperature in the desiccator (to prevent moisture absorption), then use an electronic balance to weigh the total mass of the dried sample and container, noted as m2.
- Calculate moisture content
Calculation of moisture content: Moisture content (W) can be calculated by the following formula:
[ W = \frac{m1 – m2}{m1 – m0}
\times 100% ]
Where m0 is the mass of the container, m1 is the total mass of the sample and container before drying, and m2 is the total mass of the sample and container after drying.
- Caution
Sample Selection
Ensure that the samples selected are representative to avoid errors caused by too high or too low local moisture content.
Instrument Calibration
Regularly calibrate the electronic balance and drying oven to ensure the accuracy of the measurement results.
Temperature control
The temperature of the drying oven should be kept stable to avoid the influence of temperature fluctuation on the measurement results.
Time Control
The drying time should be long enough to ensure that the water in the sample is completely evaporated. At the same time, excessive drying time should be avoided to cause decomposition or oxidation of the sample.
The moisture content of ammonium metatungstate can be accurately determined by the loss on drying method. The method is simple and easy to use, and the results are accurate and reliable. In practice, attention should be paid to the representativeness of the sample, the calibration of the instrument, the control of temperature and the control of time to ensure the accuracy of the measurement results.
How to do the moisture content determination of Ammonium Metatungstate?
Moisture content determination of Ammonium Metatungstate can usually be done by various methods, the following is a commonly used method of loss on drying, which is based on measuring the difference in mass of the sample before and after drying to determine the moisture content.
- Preparation stage
Sample Preparation
Obtain a representative sample from the ammonium metatungstate product, make sure the sample is well mixed and not contaminated.
Instrument preparation
Prepare a drying oven (constant temperature oven) to ensure that it can provide a constant temperature (e.g., 105°C ± 2°C) and an accurate electronic balance for measuring the mass of the sample.
- Measurement Procedure
Weighing the container
First, use the electronic balance to weigh the mass of a clean, dry container (e.g., a weighing bottle), noted as m0.
Weigh the sample.
Then, place an appropriate amount of ammonium metatungstate sample in the container and record the total mass of the sample and container, noted as m1.
Drying process
The container containing the sample is placed in a drying oven at a pre-set temperature for drying treatment. The drying time is usually 1-2 hours to ensure that the water in the sample is completely evaporated.
Cooling and weighing
Remove the dried container and cool it to room temperature in the desiccator (to prevent moisture absorption), then use an electronic balance to weigh the total mass of the dried sample and container, noted as m2.
- Calculate moisture content
Calculation of moisture content: Moisture content (W) can be calculated by the following formula:
[ W = \frac{m1 – m2}{m1 – m0}
\times 100% ]
Where m0 is the mass of the container, m1 is the total mass of the sample and container before drying, and m2 is the total mass of the sample and container after drying.
4. Precautions
Sample SelectionEnsure that the samples selected are representative to avoid errors caused by localized high or low moisture content.
Instrument Calibration
Regularly calibrate the electronic balance and drying oven to ensure the accuracy of the measurement results.
Temperature control
The temperature of the drying oven should be kept stable to avoid the influence of temperature fluctuation on the measurement results.
Time Control
The drying time should be long enough to ensure that the water in the sample is completely evaporated. At the same time, excessive drying time should be avoided to cause decomposition or oxidation of the sample.
The moisture content of ammonium metatungstate can be accurately determined by the loss on drying method. The method is simple and easy to use, and the results are accurate and reliable. In practice, attention should be paid to the representativeness of the sample, the calibration of the instrument, the control of temperature and the control of time to ensure the accuracy of the measurement results.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
