Abstract: A composition, method, and device for quantitatively determining the concentration of a dialdehyde in a sample are disclosed. The device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of interacting with a dialdehyde to produce a detectable and measurable response for dialdehyde concentration over a range of 0% to about 20%, by weight of the sample. An indicator reagent composition contains: (a) a diamino carboxylic acid, (b) an optional polymer and (c) a carrier. An indicator reagent composition is incorporated into a carrier matrix to provide a test pad useful in a dry phase dialdehyde assay of a sample, especially for samples containing a high concentration of glutaraldehyde.

Abstract: A composition, method, and device for quantitatively determining the concentration of an aldehyde in a sample are disclosed. The device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of interacting with the aldehyde to produce a detectable and measurable response for aldehyde concentration over a range of 0% to over 4%, by weight of the sample. An indicator reagent composition contains: (a) a protein, (b) an amine, (c) a color indicator, (d) preferably a neutral, nonionic polymer, such as a water-soluble cellulose polymer, and (e) a carrier. An indicator reagent composition is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase aldehyde assay of a sample, especially for samples containing a high concentration of glutaraldehyde or formaldehyde.

Abstract: A composition, method, and test device for quantitatively determining the oxidant concentration of a test sample are disclosed. The test device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of interacting with an oxidant to produce a detectable and measurable response for oxidant over a wide concentration range of oxidant. An indicator reagent composition contains: (a) an iodide salt, (b) a buffer, and (c) a water-soluble polymer, preferably a cellulose-based polymer. An indicator reagent composition is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase oxidant assay of a test sample, especially for test samples containing a high concentration of oxidant, like chlorine or a peroxide.

Abstract: A composition, method, and test device for determining a low concentration of total available chlorine concentration in a test sample are disclosed. The test device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of converting combined available chlorine to free available chlorine and of interacting with free available chlorine to produce a detectable and measurable response for total available chlorine over a range of 0 to about 2 ppm total available chlorine in the test sample. An indicator reagent composition contains: (a) an indicator dye that is responsive to free available chlorine, such as tetramethylbenzidine, (b) a buffer, (c) an optional surfactant, (d) a catalyst, and (e) a polymer. An indicator reagent composition is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase total available chlorine assay of a test sample, such as a source water for a hemodialysis unit.

Abstract: A composition, method, and test device for determining the total available chlorine concentration, and the relative amounts of free and bound chlorine, of a test sample are disclosed. The test device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of converting combined available chlorine to free available chlorine and of interacting with free available chlorine to produce a detectable and measurable response for total available chlorine over a range of 0 to over 5000 ppm total available chlorine in the test sample. An indicator reagent composition contains: (a) an indicator dye that is responsive to free available chlorine, such as tetramethylbenzidine, (b) a buffer, (c) a surfactant, (d) an optional catalyst, and (e) an optional polymer.

Abstract: A composition, method, and test device for determining the total available chlorine concentration of a test sample are disclosed. The test device includes a test pad having a suitable carrier matrix incorporating an indicator reagent composition capable of converting combined available chlorine to free available chlorine and of interacting with free available chlorine to produce a detectable and measurable response for total available chlorine over a range of 0 to over 5000 ppm total available chlorine in the test sample. An indicator reagent composition contains: (a) an indicator dye that is responsive to free available chlorine, such as tetramethylbenzidine, (b) a buffer, (c) a surfactant, (d) an optional catalyst, and (e) an optional polymer. An indicator reagent composition is incorporated into a carrier matrix, like filter paper, to provide a test pad useful in a dry phase total available chlorine assay of a test sample, such as a sanitizing solution for a hemodialysis unit.