Apparatus for the selective determination of the concentration o

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Osmotic pressure

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G01N 1304

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active

052110559

ABSTRACT:
This invention relates to an apparatus for the selective determination of e concentration of a substance dissolved in a solvent by means of an osmosis cell. The osmosis cell according to the invention contains a substance not contained in the solution to be tested, which is either practically insoluble or is impermeable for the membrane. This substance reacts chemically with the substance permeating into the osmosis cell, with a product resulting from it in the cell or with a product resulting from the substance in the solution to be tested and permeating into the cell. Reaction products are thereby formed which produce a pressure in the osmosis cell, which is different from the osmotic pressure of the chemically converted portion of the substance. A pressure increase thereby occurs in the cell, from which the concentration of the substance in the solution to be tested can be determined on the basis of standard values.

REFERENCES:
patent: 4666672 (1987-05-01), Miller et al.
patent: 4706495 (1987-11-01), Steudle et al.
patent: 4891968 (1990-01-01), Steudle et al.

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