Concrete masons' hand rinse
First Claim
1. A buffered rinse for reducing alkalinity and chromium contamination of residues from wet cement on concrete workers'"'"' skin and tools consisting of at least one metal salt selected from the group consisting of monosodium phosphate, disodium phosphate and potassium monobasic phosphate dissolved in water at concentrations of 1/2 percent to 20 percent by weight, and a color pH indicator;
- the rinse having an effective resulting pH in the range of 7.0 to 4.0; and
wherein said amount of metal salt is effective to reduce the development of contact dermatitis when the buffered rinse is exposed to human skin.
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Accused Products
Abstract
A buffer solution comprising one or more metal salts, preferably monobasic potassium phosphate and/or monosodium phosphate, dissolved in water creates a rinse having a pH near that of human skin. The buffer solution in various concentrations and compositions is adapted for routine use by professional and casual users of cement to rinse their skin and tools, as a spray-on application for skin and clothes, and as a pre-wash for laundry. The buffer solution may include other metal salts, preferably manganese sulfate, further to reduce hexavalent chromium carried into the rinse from cement. A pH color indicator such as phenolphthalein also may be included to signal when the buffer solution becomes ineffective from prolonged use.
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Citations
17 Claims
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1. A buffered rinse for reducing alkalinity and chromium contamination of residues from wet cement on concrete workers'"'"' skin and tools consisting of at least one metal salt selected from the group consisting of monosodium phosphate, disodium phosphate and potassium monobasic phosphate dissolved in water at concentrations of 1/2 percent to 20 percent by weight, and a color pH indicator;
- the rinse having an effective resulting pH in the range of 7.0 to 4.0; and
wherein said amount of metal salt is effective to reduce the development of contact dermatitis when the buffered rinse is exposed to human skin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- the rinse having an effective resulting pH in the range of 7.0 to 4.0; and
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12. A method of retarding development of contact dermatitis in concrete workers comprising
providing a buffered rinse comprising at least one compound from a group of metal salts consisting of monosodium phosphate, disodium phosphate and potassium monobasic phosphate dissolved in water wherein the pH of the resulting rinse falls in the range of 7.0 to 4.0; -
providing a container of the buffered rinse having a concentration of 11/2 percent by weight on a job site for a second stage rinse after use of a wash of plain water for tools and skin; providing a spray container of the buffered rinse having a concentration of 71/2 percent by weight on a job site for a final stage rinse;
thenrinsing concrete workers'"'"' skin and tools in plain water;
thenrinsing the concrete workers'"'"' skin and tools in the second stage buffered rinse after exposure to wet cement;
thenspraying as needed for thorough protection isolated portions of workers'"'"' skin and clothing with the final stage rinse; and allowing the buffered rinse to dry on the skin and tools. - View Dependent Claims (13)
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14. A buffered rinse for reducing alkalinity and chromium contamination of residues from wet cement on concrete workers'"'"' skin and tools consisting of potassium monobasic phosphate dissolved in water at concentrations of 1/2 percent to 20 percent by weight, and a color pH indicator;
- the rinse having an effective resulting pH in the range of 7.0 to 4.0; and
wherein said amount of potassium monobasic phosphate is effective to reduce the development of contact dermatitis when the buffered rinse is exposed to human skin. - View Dependent Claims (15, 16, 17)
- the rinse having an effective resulting pH in the range of 7.0 to 4.0; and
Specification