Method and composition for testing for the presence of an alkali

Details Method and composition for testing for the presence of an alkali Method and composition for testing for the presence of an alkali

1977-02-28

1981-01-13

Reese, Robert M.

Chemistry: physical processes

Physical processes

Crystallization

252408, 23230R, G01N 3122, G01N 3320

Patent

active

042446937

ABSTRACT:
A method and composition for detecting the presence of an alkali metal on the surface of a body such as a metal plate, tank, pipe or the like is provided. The method comprises contacting the surface with a thin film of a liquid composition comprising a light-colored pigment, an acid-base indicator, and a nonionic wetting agent dispersed in a liquid carrier comprising a minor amount of water and a major amount of an organic solvent selected from the group consisting of the lower aliphatic alcohols, ketones and ethers. Any alkali metal present on the surface in elemental form or as an alkali metal hydroxide or alkali metal carbonate will react with the acid-base indicator to produce a contrasting color change in the thin film, which is readily discernible by visual observation or automatic techniques.

REFERENCES:
patent: 2228737 (1941-01-01), Tandberg et al.
patent: 2708896 (1955-05-01), Smith et al.
patent: 2918033 (1959-12-01), Snyder
patent: 3969077 (1976-07-01), Hill

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