Development of Karl Fischer Reagents

II-1 Organic Compounds
(2) Coulometric titration
Reagents used: Aquamicron AKX 100ml
Aquamicron CXU 5ml
84
Substance
Acetone
Methyl ethyl ketone
Methyl isobutyl ketone
Acetylacetone
Acetophenone
Cyclopentanone
Cyclohexanone
Diacetone alcohol
2-Methoxy-2-methyl-4 -pentanone
Sample quantity
(g)
0.3954
0.4141
0.8010
0.9760
0.5451
0.4955
0.3117
0.9602
1.8963
Measurement value
(µg)
907
464
102
683
215
1090
635
217
81
MoistureContent
(%)
0.229
0.112
127ppm
0.700
394ppm
0.220
0.204
226ppm
043ppm
Measurable
amount (ml)
It is important to be aware of patterns of blank current (also described as
"background" or "drift" current) in the moisture meter. If a gradual rise in the
blank current causes the end point to fluctuate, it will not be possible to
obtain accurate analytical results. In such cases the electrolyte must be
replaced.
10
15
15
15
15
5
2