Method of adjusting pH

Details Method of adjusting pH Method of adjusting pH

1978-01-13

1978-12-26

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

204 1T, G01N 2710, G01N 2740, G01N 2746

Patent

active

041314280

ABSTRACT:
In a potentiometric system for measuring low levels of ion activity, a method of adjusting the pH in a sample stream by the passive addition of low molecular weight acid or base reagent, without dilution of the sample stream, and without introduction of any interfering, reactive or test ions into the sample stream. A membrane is provided, permeable to the acid or base reagent used to adjust sample stream pH, and impermeable to ionic species. The membrane is placed between a reagent reservoir and the sample stream. Constant flow of the sample stream by the membrane maintains the reagent partial pressure differential between the reservoir and the stream, causing diffusion of reagent through the membrane into said stream.

REFERENCES:
patent: 3495943 (1970-02-01), Kapff
patent: 3689222 (1972-09-01), McFarland et al.
patent: 3864087 (1975-02-01), Hirshfeld
patent: 3996123 (1976-12-01), Kruishoop
patent: 4025308 (1977-05-01), Holman

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