Matters needing attention in the use of Karl Fischer moisture analyzer
Most instruments use a polarized double platinum electrode to measure voltage. When cleaning, the electrode is generally placed in an ultrasonic cleaning tank with deionized water or ethanol for several minutes; under normal circumstances, the drift value of the instrument is a few microliters per minute (referring to keeping the titration cell dry, per unit time The amount of Karl Fischer reagent consumed; on the one hand this reagent is used to titrate the water in the titration cell. On the other hand it compensates for the consumption of iodine caused by slow side reactions). If the drift value becomes larger, you must check the tightness of the instrument or consider regenerating the molecular sieve. During regeneration, the molecular sieve is placed in a drying furnace at 160-300 ° C for at least 24 hours. The molecular sieve installed on the waste liquid bottle contains water and sulfur dioxide, so it must be washed with distilled water before regeneration.
The burette was washed with absolute ethanol solution. Do not place the burette at a temperature above 40 ° C. The instrument must be placed in a dry and clean environment, and arrange for someone to keep it. If it will not be used for a long time, all reagents in the instrument must be drawn out, and all pipelines must be cleaned and air-dried.
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