Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
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II-2. Inorganic 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 />
128<br />
Substance<br />
Di-ammonium hydrogen phosphate<br />
Sodium nitrate<br />
Sodium nitrate<br />
Dehydrated<br />
solvent<br />
General-use<br />
"<br />
Sugar-type<br />
Sample<br />
quantity (g)<br />
0.1511<br />
2.1116<br />
2.2079<br />
Note:* Partially insoluble. ** Soluble<br />
Measurement<br />
value (mg)<br />
3.94<br />
2.46<br />
2.73<br />
(2) 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) 50-100ml<br />
Substance<br />
Heating<br />
temperature( � C)<br />
Sample<br />
quantity (g)<br />
Measurement<br />
value (mg)<br />
Moisture<br />
content (%)<br />
2.61<br />
0.116*<br />
0.124**<br />
Moisture<br />
content (%)<br />
Sodium metasilicate 200 0.1039 41.52 40.0<br />
(3) Moisture vaporization - Coulometric titration<br />
<strong>Reagents</strong> used: Aquamicron AX (or AS) 150ml<br />
Aquamicron CXU 10ml<br />
Substance<br />
Aluminum nitrate<br />
Sodium nitrate<br />
"<br />
Sodium tripolyphosphate<br />
"<br />
"<br />
Di-ammonium hydrogen phosphate<br />
Tri-sodium phosphate<br />
Magnesium hypophosphite<br />
Heating<br />
temperature( � C)<br />
700<br />
130<br />
400<br />
100<br />
150<br />
250<br />
110<br />
150<br />
180<br />
Sample<br />
quantity (g)<br />
0.0200<br />
2.0903<br />
0.4948<br />
1.1821<br />
1.1219<br />
1.1523<br />
0.0960<br />
0.0342<br />
0.0338<br />
Measurement<br />
value (µg)<br />
08853<br />
00721<br />
01501<br />
01555<br />
06044<br />
End point<br />
02568<br />
18449<br />
13640<br />
Moisture<br />
content (%)<br />
44.300<br />
345ppm<br />
00.303<br />
00.132<br />
00.539<br />
not reached<br />
02.680<br />
53.900<br />
40.400
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