Abstract: A simplified reagent system for the analysis of arsenic in an acidic aqueous environment is disclosed. In accordance with the inventive technology, a two reagent system is provided. The first reagent includes a combination of an acidifying agent and an oxidizing agent, and is in particulate form. The second reagent is zinc in particulate form, and is beneficially used in the analysis in the presence of an effective amount of an agent for increasing the rate of arsine gas production.

Abstract: A simplified reagent system for the analysis of arsenic in an acidic aqueous environment is disclosed. In accordance with the inventive technology, a two reagent system is provided. The first reagent includes a combination of an acidifying agent and an oxidizing agent, and is in particulate form. The second reagent is zinc in particulate form, and is beneficially used in the analysis in the presence of an effective amount of an agent for increasing the rate of arsine gas production.

Abstract: Water soluble analytical agents for chlorine analysis of water are delivered into a sample from a support that is beneficially moved in the sample to assist delivery and mixing. Beneficially, an immediate photometric analysis of free chlorine is provided, and variability of measurements is reduced. Advantageously, the analysis is a touch-free chlorine analysis.

Abstract: A beneficial photometric analytical method is described according to which an effective amount of at least one analytical agent for photometric analysis, is delivered from a support into a liquid sample, and advantageously a mixing action may be provided, by moving a portion of the support in the sample. The sample may be added to a photometric cell disposed in a photometric instrument, or may be added to a photometric instrument cell chamber (or well). In accordance with an advantageous feature of the method, the photometric instrument is beneficially waterproof. A photometric cell that provides more than one optical path length may beneficially be used, and a particular optical path length selected by rotation of the photometric cell in the cell chamber. Also described is a beneficial photometric apparatus.

Abstract: Semi-quantitative colorimetric analysis of a fibrous matrix disposed on a support, and quantitative analysis of liquid color, are described. Cyanide and a halogenating reagent are reacted to produce a cyanogen halide, and Konig reagents are reacted with the cyanogen halide to yield a colorimetrically analyzable complex. A beneficial photometric method is also described. In addition, a reagent delivery device that includes a beneficial fibrous matrix for rapid delivery of reagents and rapid liquid color analysis, is described.

Abstract: Water soluble analytical agents for chlorine analysis of water are delivered into a sample from a support that is beneficially moved in the sample to assist delivery and mixing. Beneficially, an immediate photometric analysis of free chlorine is provided, and variability of measurements is reduced. Advantageously, the analysis is a touch-free chlorine analysis.

Abstract: A beneficial photometric analytical method is described according to which an effective amount of at least one analytical agent for photometric analysis, is delivered from a support into a liquid sample, and advantageously a mixing action may be provided, by moving a portion of the support in the sample. In accordance with the method, the sample may be in a photometric cell disposed in a photometric instrument for optical analysis, or may be in a photometric instrument cell chamber (or well) normally used for receiving a photometric cell for optical analysis. In accordance with an advantageous feature of the method, the sample may be collected by immersing at least a portion of the photometric cell or the photometric instrument well, in is a bulk volume of the liquid to be analyzed, and the photometric instrument is beneficially waterproof.

Abstract: Improved calorimetric analysis technology based on the analysis of reaction gas, is disclosed. In accordance with the inventive apparatus, a gas permeable medium bearing a suitable calorimetric reagent, is positioned so that gas exiting the apparatus passes through the gas permeable medium.

Abstract: An improved method for the analysis of arsenic in an aqueous sample, is disclosed. In accordance with the inventive method, arsenic is reduced to arsine gas in an acidic aqueous reaction environment and in the presence of an effective amount of an agent for increasing the rate of arsine gas production. Beneficially, metal cations are used as rate-increasing agents.

Abstract: A method and calorimetric test strip for determining analyte concentration are provided. The test strip includes an aperture exposing a face of an calorimetric indicator-bearing carrier. Sensitivity is enhanced by flowing contact of the liquid to be analyzed, through the carrier and with the indicator.

Abstract: A novel immersible colorimetric test strip is provided. The test strip includes a flow through, colorimetric indicator-bearing carrier, and a substance separately carried on the test strip for chemically modifying analyte into a detectible ionic form for color development of the indicator. Also provided are a test kit and an analysis method for using the kit.

Abstract: A colorimetric test strip useful for analysis of free chlorine is provided. In a preferred embodiment, 3,3',5,5'-tetramethylbenzidine is the colorimetric indicator. Beneficially, the carrier for the indicator has been treated to have a pH that eliminates chloramine interference. Advantageously, the indicator in free base form and a suitable water-soluble buffer may be deposited on the carrier using a combined solution of indicator and buffer.

Abstract: Improved method and device for detection and semi-quantitative colorimetric determination of molybdate, ferric, and vanadate ions in aqueous solutions and coolant systems containing ethylene glycol and coolant additive. The disclosed device comprises of test strips of absorbent support carrier or water resistant film impregnated uniformly with a hydroxylamine salt and a polyhydroxy organic acid such as gallic acid or its derivatives. Molybdate ions result in an orange/brown colorataion, ferric and vanadate ions result in a grey-blue/black coloration with color intensity directly proportional to concentration of ions.