Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
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III-1. Industrial Products<br />
9. Fibers, Papers<br />
Because samples <strong>of</strong> fibers and paper do not dissolve in dehydrated<br />
solvent, moisture content is measured using moisture vaporization<br />
followed by <strong>Karl</strong> <strong>Fischer</strong> titration (volumetric or coulometric).<br />
A heating temperature <strong>of</strong> 130-150 � C is appropriate for moisture<br />
vaporization. Moisture content in samples <strong>of</strong> these substances typically<br />
reaches several per cent. The following guidelines are suggested for<br />
sample quantities.<br />
1) Volumetric titration: 0.5g<br />
2) Coulometric titration: 0.05-0.1g<br />
152<br />
Key Points<br />
Reference: Muroi, K. et al., "Determination <strong>of</strong> Water Content in Electric<br />
Insulating Papers by the <strong>Karl</strong> <strong>Fischer</strong> Method" in Bunseki<br />
Kagaku 30, 624 (1981).<br />
[Examples <strong>of</strong> Measurement]<br />
(1) Moisture vaporization - Volumetric titration<br />
<strong>Reagents</strong> used: <strong>Karl</strong> <strong>Fischer</strong> Reagent SS-Z (or SS)<br />
Dehydrated Solvent GEX (or MS) + PG (3:1) 50-100ml<br />
Substance<br />
Bakelite paper<br />
Condenser paper<br />
Pressed board paper<br />
Filter paper<br />
Heating Temperature<br />
( � C)<br />
150<br />
150<br />
150<br />
230<br />
Sample Quantity<br />
(g)<br />
0.5111<br />
0.4955<br />
0.6646<br />
0.1700<br />
(2) Moisture vaporization - Coulometric titration<br />
<strong>Reagents</strong> used: Aquamicron AX (or AS) 150ml<br />
Aquamicron CXU 10ml<br />
Measurement Value<br />
(mg)<br />
34.70<br />
36.74<br />
49.29<br />
08.82<br />
Moisture Content<br />
(%)<br />
6.80<br />
7.42<br />
7.42<br />
5.19
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