Disposable colorimetric ph indicator and sampling device for swimming pool water and the like
Abstract
Abstract A DISPOSABLE PH COLORIMETRIC INDICATOR AND SAMPLING DEVICE PARTICULARLY FOR SWIMMING POOL WATER IS FORMED BY EMBOSSING A SYNTHETIC PLASTIC SHEET WITH A SYRINGE-LIKE CAVITY AND CLOSING THE CAVITYBY ADHERING A PLANE SYNTHETIC PLASTIC SHEET OVER THE CAVITY, THE TWO SHEETS BEING EITHER HEAT-SEALED OR ADHESIVELY JOINED TOGETHER ON THE MARGINS AROUND THE CAVITY, THE CAVITY HAVING A TUBULAR PORTION ONE ENDOF WHICH OPENS AT THE EDGE OF THE ADHERED SHEETS, AND THE OTHER END OF THE CAVITY BEING ENLARGED TO FORM A FINGER-COMPRESSIBLE ENLARGEMENT. AN INTERIOR COATING OF A PH COLORIMETRIC INDICATOR COMPOSITION REACTIVE WITH THE WATER TO BE TESTED IS PROVIDED, THE LIQUID BEING DRAWN INTO THE TUBULAR CAVITY BY FIRST COMPRESSING THE ENLARGEMENT, AND RELEASING THE PRESSURE TO DRAW IN A WATER SAMPLE TO DISSOLVE AND REACT WITH THE INDICATOR COATING. THE PREFERRED INDICATOR COMPOSITION COMPRISES A SODIUM SALT OF PHENOL RED, AN ANTICHLOR REAGENT AND A BINDER.
Inventors
- 👤 Ward B Davis
Bibliographic Details
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