7 reasons why Karl Fischer Moisture Analyzer affects accuracy
In addition to determining the nature of the sample, the method of determination, the selection of the calibration material, the sampling method and the size of the injection affect the accuracy of the measurement, the following issues must also be noted to ensure the accuracy of the measurement.
1. Stirring at the time of drip should be sufficient and uniform.
2. When injecting, prevent the syringe head from being contaminated by the outside and affect the measurement results, and prevent the loss of the sample during injection.
3. The Karl Fischer reagent bottle inlet should be equipped with a dryer to prevent the reagent from absorbing the moisture in the air and causing a serious measurement error due to the decrease in the titer of the reagent.
4. The ability to oxidize iodide to iodine is itself reduced to hydroquinone. Such reactions as the peroxide, chromate, divalent copper and ferric salt of the inorganic compound can cause errors in the measurement.
5. Some weak oxoacid salts, such as carbonates and borate, react primarily with HI to form water interference assays. Inorganic acids and acid oxides do not interfere with the assay. Ammonia can form iodide by direct titration with Karl Fischer reagent, and excess acetic acid can be added before titration to eliminate this disturbance.
6. The active chlorine contained in the ferric chloride and the reagent, such as dichloroisocyanate, can be reduced by HI in the Karl Fischer reagent. This interference can be removed by pretreatment of the sample with pyridine and sulfur dioxide and methanol solutions.
7. Silanol and Karl Fischer reagents also have a quantitative reaction which can be prevented by dilution with high molecular weight alcohol and pyridine.
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