Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
Development of Karl Fischer Reagents
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Substance<br />
Semicarbazide hydrochloride<br />
Phenylhydrazine hydrochloride<br />
Chapter II: Applications - 1<br />
Sample moisture<br />
content (%)Amount added<br />
(%) Added moisture Measurement value<br />
0.39�0.00<br />
0.37�0.01<br />
16. Other Nitrogenous Compounds<br />
Key Points<br />
2.52<br />
2.50<br />
2.50<br />
2.53<br />
Both volumetric and coulometric titration can be used directly for other<br />
nitrogenous compounds. For volumetric titration, the substance is<br />
dissolved in a general-use dehydrated solvent and titrated. If a<br />
substance is difficult to dissolve its solubility can be improved with the<br />
addition <strong>of</strong> another solvent.<br />
Coulometric titration is carried out using a general-purpose electrolyte<br />
and in accordance with standard procedures.<br />
Examples <strong>of</strong> substances that can be titrated directly:<br />
Lactam, Imines<br />
-Caprolactam, benzal-n-butylimine<br />
Cyanohydrine<br />
Formaldehyde cyanohydrin, acetone cyanhydrin, acrolein cyanohydrines<br />
Azo-, azole compounds<br />
p-Aminoazobenzene, diazoaminobenzene, benzotriazole<br />
Isocynates, nitroso compounds<br />
1-Naphthyl isocynate, phenyl isocyanate, N-nitrosodiphenylamine<br />
Nitro compounds<br />
Nitromethane, nitroglycerine, 2-nitropropane, m-dinitrobenzene, 3,5dinitrobenzoic<br />
acid<br />
Oximes, hydroxamic acids<br />
Acetone oxime, dimethylglyoxime, butylaldoxime, hepta-aldoxime,<br />
cyclohexanone oxime<br />
Cyanic acid derivatives<br />
Cyanamides, dicyanamides, cyanuric acid, melamine<br />
Amidines<br />
Guanidine nitrate<br />
103
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