Apparatus for determining the pH of liquids

Details Apparatus for determining the pH of liquids Apparatus for determining the pH of liquids

1991-09-04

1993-08-17

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415321, 204408, 204433, G01N 27416

Patent

active

052365689

ABSTRACT:
A method for determining the pH of liquids by a pH difference measurement of a solution under test and a reference solution and an apparatus for determining the pH of liquids is provided which can determine the pH with a precision equal to or better than 0.001 pH. The method and apparatus are especially useful for determining the pH and development speed of developers for positive photoresists.

REFERENCES:
patent: 2563062 (1951-08-01), Perley
patent: 3681205 (1972-08-01), Ducksbury et al.
patent: 3839162 (1974-10-01), Ammer
patent: 3862895 (1975-01-01), King et al.
patent: 4154660 (1979-05-01), Micko
R. Brdicka, "Principles of Physical Chemistry", 1963, p. 626.
R. Brdicka, "Principles of Physical Chemistry", 1963, p. 612.
R. Brdicka, "Principles of Physical Chemistry", 1963, pp. 615-618.

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