Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
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II-1 Organic Compounds<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 GEX (or MS) 25-50ml<br />
104<br />
Substance<br />
Nitromethane<br />
Nitroethane<br />
1-Nitropropane<br />
m-Nitroaniline<br />
p-Nitrophenol<br />
o-Nitro-p-chloroaniline<br />
m-Dinitrobenzene<br />
2,4-Dinitrotoluene<br />
-Caprolactam<br />
N-Methyl pyrrolidine<br />
m-Nitro-p-toluidine<br />
p-Dichloro nitrobenzene<br />
Dehydrated<br />
solvents<br />
General-use<br />
"<br />
"<br />
"<br />
"<br />
"<br />
"<br />
"<br />
"<br />
"<br />
*1<br />
*2<br />
Sample<br />
Quantity (g) Measurement<br />
Value (mg)<br />
5.6235<br />
2.0672<br />
1.8575<br />
2.3233<br />
0.9844<br />
0.9209<br />
1.0835<br />
1.9935<br />
1.5336<br />
3.1519<br />
2.1785<br />
10.1400<br />
0.99<br />
4.63<br />
2.75<br />
1.26<br />
11.30<br />
0.30<br />
0.15<br />
0.06<br />
3.22<br />
2.14<br />
0.45<br />
0.78<br />
*1: Dehydrated Solvent MS 25ml + dinitromethane 10ml<br />
*2: Dehydrated Solvent MS 25ml + dichloromethane 10ml<br />
(2) Coulometric titration<br />
<strong>Reagents</strong> used: Aquamicron AX (or AS) 100ml<br />
Aquamicron CXU 5ml<br />
Substance<br />
Nitromethane<br />
Nitroethane<br />
1-Nitropropane<br />
2-Nitropropane<br />
p-Nitrophenol<br />
m-Nitroaniline<br />
m-Nitro-p-toluidine<br />
o-Nitro-p-chloroaniline<br />
N-Vinyl pyrrolidone<br />
-Caprolactam<br />
Isocyanate<br />
Sample quantity<br />
(g)<br />
1.1312<br />
10237<br />
0.9757<br />
1.0338<br />
0.5196<br />
1.5120<br />
2.0193<br />
1.0060<br />
1.0675<br />
0.6448<br />
3.3597<br />
Measurement value<br />
(µg)<br />
993<br />
2224<br />
1324<br />
816<br />
5507<br />
875<br />
404<br />
295<br />
340<br />
1290<br />
95<br />
Moisture<br />
Content (%)<br />
0.018<br />
0.22<br />
0.15<br />
0.054<br />
1.15<br />
0.033<br />
0.014<br />
0.003<br />
0.21<br />
0.068<br />
0.021<br />
0.008<br />
Moisture Content<br />
(ppm)<br />
879<br />
0.217%<br />
0.136%<br />
789<br />
1.06%<br />
579<br />
200<br />
293<br />
319<br />
0.200%<br />
028<br />
In all cases, samples can be measured up to a volume <strong>of</strong> 20-50ml, as shown<br />
in the table.
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