Diaphragm-Free Cell for Trace Determination of Water Based on the Karl Fischer Reaction Using Continuous Coulometric Titration

摘要

A new type of diaphragm-free coulometric cell for continu- ous coulometric Karl Fischer titrations of water in the range 0.1-1000μg is described. The relative standard deviation obtained for titrations of 1μg amounts of water was typically 1/100. The background due to diffusion of water from the air was normally in the range 0.3-0.9μg of water min~-1 depending on environmental humidity. The variation in the background was normally +-0.01μg min~-1.