Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Vapor pressure
Patent
1988-02-23
1990-01-09
Chapman, John
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Vapor pressure
G01N 1304
Patent
active
048919683
ABSTRACT:
This invention relates to a process and apparatus for the determination of he concentration of substances dissolved in a solvent. For this purpose, an osmotic cell is used, in which first, by means of an (external) reference solution, a working pressure is established, and after replacement of the reference solution by the solution to be tested, the pressure curve established in the cell is determined. The object is also to determine the concentrations of substance present in high concentration with very great absolute precision. For this purpose, an osmometer solution is selected which contains an excess of not more than 80 mOsm more than the reference solution, and in which the substances to be measured are contained in such a concentration that the difference of the concentrations of the substances in the solution to be tested and in the osmometer solution is not more than 70 mOsm. The total concentration of the substances is then determined taking into consideration the concentration of the substances in the osmometer solution. For the determination of very small deviations of the substances (less than 20 mOsm), the temperature of the solutions at the measurement point is kept constant, for which purpose there is provided an appropriate device.
REFERENCES:
patent: 4706495 (1987-11-01), Steudle et al.
Boling Gerd
Steudle Ernst
Zillikens Josef
Chapman John
Kernforschungsanlage Julich Gesellschaft mit beschrankter Haftun
Ljungman Nils H.
Roskos Joseph W.
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