Chemistry: analytical and immunological testing – Oxygen containing – Ozone or peroxide
Patent
1990-05-24
1992-08-18
Hill, Jr., Robert J.
Chemistry: analytical and immunological testing
Oxygen containing
Ozone or peroxide
422 56, 436 1, 436167, 436169, 436904, G01N 2178
Patent
active
051399571
ABSTRACT:
The present invention provides a chemical indicator for the detection of hydrogen peroxide. A composition containing an aqueous solution of potassium dichromate is applied to a porous substrate. The reaction between the dichromate and chromate ions present in solution and hydrogen peroxide is accompanied by a dramatic color change which is visible to the naked eye. The initial color of the potassium dichromate solution may be enhanced by adjusting the pH of the solution to be basic. The rate of reaction between the dichromate and chromate ions and the hydrogen peroxide may be increased by the addition of the humectant urea to the potassium dichromate solution.
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American Sterilizer Company
Hill Jr. Robert J.
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