Development of Karl Fischer Reagents

I-1. Questions & Answers about Karl Fischer Reagents
system. The rubber should then be replaced, and the syringe weighed
again. The difference in weights should be equal to the weight of the
sample.
3. Combination of Aquamicron Products
Anolyte
Catholyte
4. Direct Titration
This method is suitable for liquid, solid or gaseous substance that can be
dissolved in Aquamicron. Direct titration should not be used for insoluble
solid samples since these may clog the membranes or affect the efficiency
of the current.
[Procedures]
52
General use With ketones
Aquamicron AX or
Aquamicron AS
Aquamicron CXU
Aquamicron AKX
Aquamicron CXU
a) Approximately 100ml of anolyte (Aquamicron AX, AS or AKX) is placed in
an electrolyte cell (Figure 3) that has been carefully dried.
b) The entire contents of a catholyte ampoule (Aquamicron CXU, 5ml) is
placed in the catholyte chamber.
c) An electrolytic current is applied to the anode-cathode while it is stirred to
produce iodine and trigger the Karl Fischer reaction in order to remove all
water from the electrolysis cell. (It is not necessary to read the moisture
content at this stage.)
d) The sample is introduced into the electrolysis cell and coulometric titration
is then carried out until the end point.
e) Moisture content is calculated according to the following formula.
W1=M/S
or W2=M x 100/(Sx10 6 )
Where W1: Moisture content (ppm)
W2: Moisture content (%)
M: Measurement value (µgH2O)
S: Amount of sample (g)