Method and device for determining the concentration of a material in a liquid
Abstract
Abstract A LAYERED TESTING DEVICE IS USED FOR QUANTITATIVELY DETERMINING THE CONCENTRATION OF A SUBSTANCE. THE LAYERED DEVICE INCLUDES A FIRST POROUS LAYER IMPREGNATED WITH A REAGENT SYSTEM ADAPTED TO REACT WITH THE TEST SUBSTANCE TO PRODUCE AN END PRODUCT. ADJACENT TO THE FIRST POROUS LAYER IS A MEMBRANE HAVING PLURAL REGIONS EACH HAVING A DIFFERENT PERMEABILITY TO SAID END PRODUCT. THE DIFFERENCE IN PERMEABILITY IS OBTAINED EITHER BY IMPREGNATING THE REGIONS WITH DIFFERENT CONCENTRATIONS OF A CHEMICAL REACTIVE WITH THE END PRODUCT OR BY VARYING THE PORE SIZE IN THE GERIONS. ADJACENT THE MEMBRANE THERE MAY BE A POROUS ELEMENT TO AID IN DRAWING THE END PRODUCT UNDER TEST OUT OF THE MEMBRANE. IMMEDIATELY ADJACENT TO THE POROUS ELEMENT IS AN INDICATOR LAYER CONTAINING AN INDICATOR SUBSTANCE FOR PROVIDING VISUAL INDICATION OF ANY OF SAID END PRODUCT REACHING THE INDICATOR LAYER. BY MARKING THE INDICATOR LAYER IN ACCORDANCE WITH THE REGION''S PERMEABILITIES, A VISUAL INDICATOR OF AND METHOD OF DETERMINING CONCENTRATION IS AVAILABLE.
Inventors
- 👤 L Liotta
Bibliographic Details
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