Development of Karl Fischer Reagents

I-1. Questions & Answers about Karl Fischer Reagents
[Characteristics]
a) The titer is stable.Even when stored properly under air-tight conditions,
Karl Fischer reagents tend to lose titer due to self-reaction. With SS-Z,
the titer remains extremely stable and changes at less than 0.05% per
day even when stored at room temperature.
b) SS-Z is suitable even for moisture titration of ketones, which have an
interfering effect.SS-Z does not contain methanol, which reacts with
ketones. The moisture content of ketones can be measured easily by
using SS-Z in combination with the Dehydrated Solvent KTX. (For
aldehydes, use SS in combination with CP or PP Dehydrated Solvent).
c) SS-Z Karl Fischer reagent is available in three titers to suit samples with
different moisture contents. The 3mg/ml product is generally regarded
as a standard type and should be used first.
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KarFischer Reagent SS: Pyridine Type
Karl Fischer Reagent SS is the traditional product containing pyridine. Its
performance is similar to that of Karl Fischer Reagent SS-Z. It is available in
a titer of 10mg/ml, making it suitable for samples with a high moisture
content.
For Your Information
Mitsubishi Chemical's series of Karl Fischer reagents are supplied in brown
glass bottles sealed with lids containing packing. Provided that the bottles
are sealed, they can be stored for long periods with only a minimal decline
in titer due to moisture absorption. Once the seal is broken, however,
moisture absorption could cause titer to decline unless storage conditions
are optimal. Care should be taken to close caps tightly.
Karl Fischer Reagent SS is a high-titer product and maintains a stable titer
over long periods. Depending on the storage environment, however, minute
amounts of sediment may be observed. This has no effect on the
effectiveness of the reagent, which can be still used.