Development of Karl Fischer Reagents

II-1 Organic Compounds
94
Substance
Sodium L-aspartate
Lithium citrate
Sodium citrate
Ammonium acetate
Cadmium acetate
Magnesium acetate
Lithium acetate
Sodium acetate
Sodium napthionate
Calcium lactate
Oxalic acid
Manganese benzoate
Calcium stearate
Dehydrated
solvent
General-use
"
"
"
"
"
"
"
"
"
"
"
Oil-type
11. Organic Hydrates
Key Points
Sample
quantity (g)
0.0841
0.0354
0.0812
1.2884
0.2750
0.1918
0.1003
0.0678
0.0731
0.2003
0.0825
0.0862
0.2046
Measurement
value (mg)
04.32
08.73
10.08
06.44
37.07
64.27
04.13
10.75
05.85
58.39
23.58
09.45
05.98
Moisture
content (%)
05.140
24.700
12.400
00.500
13.500
33.500
11.500
15.800
22.800
29.200
28.600
11.000
02.920
Since organic hydrates are solids, measurements can normally be
carried out directly using volumetric titration. For measurements using
volumetric titration, these substances can be dissolved or dispersed in
a general-use dehydrated solvent. As with organic acid salts,
volumetric titration is generally recommended for organic hydrates.
Water of crystallization is not always stable in organic hydrates and
moisture content frequently varies with reference to temperature and
humidity. Cyanuric acid, in particular, tends to lose most of its water of
crystallization.
Examples of substances that can be measured directly:
Pyromellitic acid, L-asparagine, creatine, L-histidine, dextrose, L-rhamnose,
raffinose, chloral hydrate, ninhydrin, alloxan, piperazine, o-phenantholine,
brucine, brucine sulfate