1. The test of the same sample by different types of halogen rapid moisture analyzers, the results are within the normal error range, thus basically eliminating the doubt of the accuracy of the instrument.
2. Carefully ask for errors with other users' moisture test results. It is found that the other test method is to use the Karl Fischer volume method or the Coulomb method to test the moisture of the sample. The results are often low.
3, the user can not judge whether the sample is in addition to moisture, there are other volatile solvents.
In summary, the error that we have in the user's sample testing process is that the user's sample has other volatile solvents in addition to moisture. At the same time, depending on the test temperature, other changes will occur. .
We know that the infrared fast moisture analyzer or the halogen rapid moisture analyzer is based on the heating weight reduction method, which is to heat the sample to a certain temperature to volatilize the moisture of the sample, thereby calculating the moisture of the sample according to the calculation function of the electronic balance. The content and accuracy are determined according to the accuracy of the electronic balance. Of course, the speed and uniformity of the heating method must also affect the accuracy of the moisture test of the sample. At present, since the heating rate of the halogen heater has priority over the infrared heating method, the price is not greatly different, and the halogen rapid moisture analyzer is gradually popularized.
If there are other volatile solvents in the sample, we will volatilize the volatile solvent while heating the volatile water, so the weight loss does not represent the exact content of water. Therefore, at this time, rapid moisture determination is used. It is inaccurate to measure the moisture of the sample. The higher the volatile solvent content, the greater the error.
If this is the case, we recommend that the user test the moisture of the sample using the Karl Fischer volumetric method or the Coulomb method. Since the Karl Fischer reagent only chemically reacts with moisture, it avoids the influence of other solvents on the moisture content of the test sample. The results tested by this method should be accurate. Of course, different methods can be used depending on the performance of the solid sample. If the sample is dissolved in methanol, it is relatively convenient to use the volumetric method. If the solid sample is not dissolved in methanol, the coulometric method is used, and a solid gasifier is used in combination.
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