Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
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Chapter III: Applications - 2<br />
such cases.<br />
Because <strong>of</strong> the high viscosity <strong>of</strong> most paints, it is difficult to obtain a<br />
sample and inject it into a titration cell. Select equipment that matches<br />
the characteristics <strong>of</strong> the sample, such as a thick needle (2mm<br />
diameter), a sampling spoon or a glass rod.<br />
(now, JIS K5407 is abolished.)<br />
[Examples <strong>of</strong> Measurement]<br />
(1) Volumetric titration<br />
<strong>Reagents</strong> used: <strong>Karl</strong> <strong>Fischer</strong> Reagent SS-Z (or SS)<br />
Dehydrated Solvent OL II, KT (or CM, CP) 25-50ml<br />
Substance<br />
Substance<br />
Enamel<br />
Paints<br />
Lacquer paint<br />
Powder paint<br />
Epoxy resin paint<br />
Fluoroethylene resin paint<br />
Polyester paint<br />
Liquid varnish<br />
Melamine varnish<br />
Dehydrated<br />
solvents<br />
Heating Temperature<br />
( � C)<br />
150<br />
130<br />
200<br />
180<br />
150<br />
180<br />
150<br />
300<br />
110<br />
Sample Quantity<br />
(g)<br />
Sample Quantity<br />
(g)<br />
0.1388<br />
1.3175<br />
0.0650<br />
0.4513<br />
2.2101<br />
1.0507<br />
0.1931<br />
0.1122<br />
0.1894<br />
Measurement Value<br />
(mg)<br />
Measurement Value<br />
(µg)<br />
1902<br />
0742<br />
2798<br />
1395<br />
1454<br />
1170<br />
0978<br />
1934<br />
1324<br />
Moisture Content<br />
(%)<br />
Epoxy resin paints Oil-type 0.6645 0.43 647ppm<br />
Fluoroethylene resin paints " 1.0017 1.11 0.111<br />
Paints " 0.9953 4.97 0.499<br />
Paint thinners (incl.MEK) Ketone-type 4.8894 4.33 886ppm<br />
Melamine varnish " 0.1504 1.09 0.725<br />
(2) Moisture vaporization - Coulometric titration<br />
<strong>Reagents</strong> used: Aquamicron AX (or AS) 150ml<br />
Aquamicron CXU 10ml<br />
Moisture Content<br />
(%)<br />
1.37<br />
563ppm<br />
4.30<br />
0.309<br />
658ppm<br />
0.111<br />
0.506<br />
1.73<br />
0.699<br />
157
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