A gas monitor configured to monitor at least one target gas in an environmental mixture, by separating and concentrating the target gas and then adjusting for the concentration factor. The adjustment may also take into account sensor sensitivities to other gases. Methods for adjustment of target gas results and increasing accuracy of monitoring are described.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

Disclosed herein is a method for manufacturing a hydrogen sensor, the method comprising the steps of: disposing a thin film made of a transition metal or an alloy thereof on a surface of elastic substrate; applying a tensile force in a repetitive manner to the elastic substrate to form a nanocrack on the thin film disposed on the surface of the elastic substrate; and injecting hydrogen gas into the formed nanocrack and then removing the hydrogen gas to form a nanogap, wherein the tensile force in the step of forming a nanocrack is applied to an extent that the elastic substrate has a tensile strain of 25% to 100%.

A fine-particle sampling device for sampling fine particles in a liquid includes a tubular first electrode whose both ends in an axial direction thereof are open; a second electrode extending in the axial direction of the first electrode and disposed in the inside of the first electrode to be spaced from an inner surface of the first electrode; a supplier that supplies a liquid to the inside of the first electrode and causes the liquid to be stored at a portion of the inner surface in a direction around an axis B of the first electrode; a voltage applicator that applies a voltage between the first electrode and the second electrode; a driver that rotates the first electrode around a rotational axis extending in the axial direction of the first electrode and passing through the inside of the first electrode; and a retriever that retrieves the stored liquid.

A detection method includes calibration mode of calibrating sensor with low-concentration gas being caused to flow along direction from the sensor toward an adsorption part, first detection mode of, after the calibration mode, detecting chemical substance with sample gas being caused to flow along the direction from the sensor toward the adsorption part, first adsorption mode of adsorbing, by the adsorption part, the chemical substance during an execution time period including time period overlapping at least part of an execution time period of the first detection mode, second adsorption mode of, after the first adsorption mode, adsorbing, by the adsorption part, the chemical substance with the sample gas being caused to flow along direction from the adsorption part toward the sensor, and second detection mode of desorbing, from the adsorption part, the chemical substance adsorbed in the first and second adsorption modes and detecting the chemical substance by the sensor.

Embodiments described herein provide devices and methods for the determination of analytes. The device typically includes an absorbent material that allows for an analyte sample to be concentrated and analyzed simultaneously and within a short period of time (e.g., less than 10 seconds). Embodiments described herein can provide portable and easily operable devices for on-site, real time field monitoring with high sensitivity, selectivity, and fast response time.

A filed portable analyzer capable of performing both the sampling and analytical procedures required by U.S. EPA Method 25 utilizing a small volume injection of sample onto a cryotrap cooled by a Stirling linear drive charged with helium to replace the field sampling condensate trap. The cryotrap is followed by the specified sorbent column/traps to ensure precise compatibility with prior reported compliance test results. The analytical system utilizes an oxidation catalyst and reduction catalyst to remove the potential for differing response factors on the FID from different compounds.

Disclosed herein are embodiments of a gas sensor system and methods of analyzing data therefrom. In embodiments, a gas sensor system includes one or more gas preconcentrator modules and one or more gas sensor modules. Each gas preconcentrator module includes a substrate that has a top surface having a gas adsorbent material attached to the top surface and has an electrical heater element for heating each preconcentrator module to release adsorb gases to the sensor. The gas sensor modules and the gas preconcentrator modules are in fluid communication with each other. The gas sensor modules responses are readout in parallel multiple times as the preconcentrators are heated yielding a 2-dimensional gas spectrum. The gas sensor output data is analyzed and compared to a library of known data to analyze the gas composition.

Systems and methods are provided for tracking all chemicals, including odors, a package is exposed to throughout the shipping process. A device is attached to the package or placed within the package to extract the chemicals that are in the surrounding environment to the device. The device can extract and concentrate volatile, semi-volatile and non-volatile chemicals that the device and the corresponding package are exposed to throughout the shipping process. The extracted chemicals may then be desorbed from the device and analyzed by an analytical instrumentation method.