Provided are a method and system for measuring hydrogen peroxide concentration in sample water collected from a prescribed position in a water treatment process and includes: collecting the sample water; measuring a concentration of a dissolved oxygen in the sample water or a treated water obtained by treating the sample water with the hydrogen peroxide decomposing device by first and second dissolved oxygen concentration measuring analyzers to obtain a corrected value that is a difference between the two dissolved oxygen concentration values; measuring the concentration of the dissolved oxygen in the sample and treated water by the first and second dissolved oxygen concentration measuring analyzers, respectively, and obtaining a measured value that is a difference between the dissolved oxygen concentration values; and calculating a corrected concentration of hydrogen peroxide from the measured value obtained during the measured value obtaining and the corrected value obtained during the corrected value obtaining.

A composition, method and kit for quantifying the concentration of one peracid or the total concentration of two or more peracids in a water source are disclosed. In particular, an oxidation sensitive or peroxycarboxylic acid selective leuco dye is used to react only with one or more peroxycarboxylic acids in a water source but not with peroxide usually co-existing in the water source. Not only does the oxidation sensitive or peroxycarboxylic acid selective leuco dye react with peracid(s) but also the reaction generates a color species that can be used visually or through absorbance measurement to quantify the peracid concentration. The method disclosed here is not a titration method, it involves a simple mixing step. The kit or composition disclosed here does not utilize a catalyst, such as iodine.

This invention relates to a chemical indicator for monitoring a vaporous hydrogen peroxide sterilization process. The chemical indicator comprises a reactive composition adhered to a substrate, the reactive composition comprising a transition metal reagent, an oxidizing agent, and a resin. A test pack containing the chemical indicator and a biological indicator is disclosed. Vaporous hydrogen peroxide sterilization processes using the chemical indicator and the test pack are disclosed.

A method of monitoring for the presence of an oxidizing chemical species in an aqueous or non-polar environment includes steps of exposing a structured compound semiconductor material to the oxidizing chemical species in the environment and detecting electromagnetic radiation emitted by the structured compound semiconductor material upon exposure to the oxidizing chemical species. The structured compound semiconductor material is a phytate scaffold material and a metal dopant.

This invention is in the field of fluorescence imaging and relates to a new near infrared (NIR) reactive oxygen species (ROS) sensor designed with controlled fluorescence on-off switching mechanism.

A method of monitoring for the presence of a hydroperoxide in an aqueous or non-polar environment includes steps of exposing a structured compound semiconductor material with peroxidase activity to the hydroperoxide in the environment and detecting electromagnetic radiation emitted by the structured compound semiconductor material with peroxidase activity upon exposure to the hydroperoxide. The luminescence emitting semiconductor material with peroxidase activity consists of a primary semiconductor material with a dopant prepared on a phytate scaffold.

A wipe for detecting the presence of an explosive substance is composed of an absorbent or adsorbent substrate and a chemical detection solution impregnated within the substrate. In one embodiment the chemical detection solution includes a combination of reagents operable, when contacted with a particular explosive substance to undergo a chemical reaction or a series of chemical reactions to produce a compound having a visible color. In another embodiment, the chemical detection solution includes a redox color indicating agent that is operable to exhibit a color change upon reacting with the explosive substance.

This invention is in the field of fluorescence imaging and relates to a new near infrared (NIR) reactive oxygen species (ROS) sensor designed with controlled fluorescence on-off switching mechanism.

An optical sensing element for use in the detection of hydrogen peroxide, the sensing element comprising a sensing compound provided as a coating on a substrate. The sensing compound, on exposure to hydrogen peroxide, forms a luminescent reporter compound when excited with stimulating radiation at a predetermined wavelength that the sensing compound does not absorb.

A method for determining the concentration of a compound in ultrapure water is provided. The method includes dividing the ultrapure water into a first part and a second part and decomposing the compound in the first part, so that the first part includes a characteristic substance. The method also includes measuring a first concentration of the characteristic substance in the first part and a second concentration of the characteristic substance in the second part and calculating the difference between the first concentration and the second concentration. The method further includes obtaining the concentration of the compound in the ultrapure water based on the difference.