Solvent for the determination of water by the Karl Fischer metho

Chemistry: analytical and immunological testing – Determination of water – By use of a karl fischer reagent

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204 1T, G01N 3318

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046199004

ABSTRACT:
The determination of water by the Karl Fischer method is carried out using a reagent containing sulfur dioxide, iodine and a base. The determination is carried out in a liquid medium in which the sample under investigation has been dissolved. The solvents used are, above all, methanol and 2-methoxyethanol. The presence of a further solvent which enables the reaction to take place without interference is advantageous. Solvents suitable for this purpose are lower alkanols which are substituted by halogen atoms and/or phenyl radicals. These alkanols are also employed as the solvent in Karl Fischer reagents.

REFERENCES:
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patent: 4351744 (1982-09-01), Muroi et al.
patent: 4354853 (1982-10-01), Dahms
patent: 4368105 (1983-01-01), Muroi et al.
Karl Fischer, Angew, Chemie 48, pp. 394-396, (1935).
Chemical Analysis, vol. 5, Aquametry, Part III, pp. 100-101 (1980).
Peters et al., Anal. Chem. 27, pp. 450-453 (1955).
Kellum et al., Analytical Chemistry, vol. 42(12), pp. 1428-1429, Oct., 1970.
Petrov et al., Journal of Analytical Chemistry of the USSR, vol. 35(11), pp. 1426-1429, Nov., 1980.

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