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Why the count decreases during determination in a coulometric titration method? |
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This event occurs when the "titration continuation time" is set and becomes lower than the BG level at the start of determination. An extremely low moisture level in the sample and an interfering reaction (oxidation of iodide) with oxidative substances are assumed. |
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Is 100% of the moisture in the sample extracted in a volumetric titration method? |
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It is desirable to dissolve the sample in a dehydrating solvent, but it is considered that the moisture in the sample can be extracted if it is not dissolved but dispersed uniformly. According to the sample, extraction may be insufficient in the cases of nonuniform liquid or large masses, but the moisture is generally extracted very quickly into dehydrating solvents. |
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Why the value is different between the loss on drying method and the KF method? |
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The circumstances are different according to the sample. If the value is higher in the loss on drying method, loss of substances other than the moisture due to heating is considered. If the value is higher in the KF method, it is considered that interference reactions may occur in the KF reaction. There is a measuring method to prevent interfering reactions. If you are not sure about this matter, please contact us. |
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The precisions of analysis and the lower limits of quantification of coulometric titration method and volumetric titration method? |
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Various factors, including the type of sample, the amount of moisture, the handling method of samples, the level of proficiency of operation and the conditions of apparatus and reagents, are involved in the precision of analysis and the lower limit of quantification. The measure of the performance of analysis is as shown below. |
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| Measure of the amount of moisture (analytical value) and relative standard deviation |
| Coulometric titration method |
Relative standard deviation (RSD) |
Volumetric titration method |
| Less than 100 ug |
10% to within 30% |
Less than 1 mg |
| 100 to 1000 ug |
Within 5% |
1 to 5 mg |
| More than 1000 ug |
Within 3% |
More than 5 mg |
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Operating suggestions for the measurement of trace moisture in plastics |
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Trace moisture measurement in plastics is one of the important inspection items. Careful operation is needed to protect dried plastics from being affected by moisture absorption. Find this file. |
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Do you have any visual instructions for the beginner of KF measurement? |
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