Reduction of detectable species migration in elements for the an

Details Reduction of detectable species migration in elements for the an Reduction of detectable species migration in elements for the an

1978-06-16

1979-08-28

Turk, Arnold

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Calorimeter

435 14, 422 57, G01N 2106, G01N 3122, G01N 3316

Patent

active

041660935

ABSTRACT:
An element for the analysis of liquids contains a radiation-transmissive, detectable species migration-inhibiting layer interposed between a porous radiation-blocking layer and a radiation-transmissive reagent layer. All three layers are permeable to a predetermined analyte. The reagent layer contains a composition that provides a detectable species such as a dye in proportion to the concentration of the analyte that diffuses into the reagent layer from the overlying porous radiation-blocking layer. The detectable species migration-inhibiting layer acts to reduce the migration of, for example, dye from the reagent layer into the porous radiation-blocking layer, where the optical density of the dye cannot easily be measured. Optionally, the above-described three layers can be carried on a radiation-transmissive support, and other layers such as spreading layers, registration layers, and subbing layers can also be present in the element.

REFERENCES:
patent: 3585112 (1971-06-01), Ernst
patent: 3901657 (1975-08-01), Lightfoot
patent: 3917453 (1975-11-01), Milligan et al.
patent: 3992158 (1976-11-01), Przybylowicz et al.
patent: 3993451 (1976-11-01), Verbeck
patent: 4042335 (1977-08-01), Clement
patent: 4050898 (1977-09-01), Goffe et al.
patent: 4066403 (1978-01-01), Bruschi

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