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Continuous measurement of water in organic solution by membrane‐inlet mass spectrometry
Author(s) -
Bohátka Sándor,
Degn Hans
Publication year - 1991
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290051002
Subject(s) - chemistry , octane , mass spectrometry , detection limit , analytical chemistry (journal) , hexanol , solubility , chromatography , microemulsion , membrane , organic chemistry , pulmonary surfactant , biochemistry , alcohol
With a membrane made of a relatively polar material, membrane‐inlet mass spectrometry can be used to measure the water activity in organic liquids of low dielectric constant. The detection limit for water depends on the solubility of water in the organic liquid. In butanol, hexanol, octanol and octane the detection limits at 45°C are 7, 4, 3 and 0.3 ppm, respectively. The half‐time of the water reponse at 45°C is 20 s. The method can be used for continuous monitoring of water in reaction systems in organic solvents. Examples given are the condensation of 2,4‐dimethyl‐3‐pentanone with phenylhydrazine in hexanol solution and the hydrolysis of acetylchloride in octane solution.