Chemical indicator that includes potassium dichromate and urea and method of using the same to detect hydrogen peroxide
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United States of America Patent
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Aug 18, 1992
Grant Date -
N/A
app pub date -
May 24, 1990
filing date -
May 24, 1990
priority date (Note) -
Expired
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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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