Colorimetric detector tube

Details Colorimetric detector tube Colorimetric detector tube

1988-09-01

1991-04-02

Lacey, David L.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

422 56, 422 59, 422 60, 422 88, 436144, 436167, G01N 3122

Patent

active

050045857

ABSTRACT:
The invention relates to a colorimetric detector tube having a porous charge. The charge contains an indicating region provided with an indicator ahead of which a pretreatment region is placed which carries a pretreatment substance. The material to be detected form products with the pretreatment substance which lead to a coloration in the indicating region. The detector tube is improved so that its indication is expanded to indicate higher detection concentrations. The detector tube is further improved so that even when the first pretreatment substance is exhausted, a colorimetric indication is made accessible to further quantities of the material to be detected. For this purpose, the charge contained in the tube includes a sequence of several pretreatment regions and indicating regions which alternate one with the other. In another configuration, the charge includes a mixture of pretreatment material and indicating material.

REFERENCES:
patent: 3399973 (1968-09-01), Grosskopf
patent: 3475129 (1969-10-01), Peurifoy et al.
patent: 3993451 (1976-11-01), Verbeck
patent: 4259287 (1981-03-01), Leichnitz
patent: 4482635 (1984-11-01), Herskovitz et al.
patent: 4680248 (1987-07-01), Roach

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