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 are described.

Various techniques are provided to implement a desorber of a sensor detector device that permits manual operation and is completely detachable from a main body of the sensor detector device. In one example, a device includes a desorber. The desorber includes an inlet comprising a fluid path configured to receive samples vaporized from sample media. The desorber also includes a cap configured to slide toward the inlet in response to a manual actuation of the cap performed by a user to transition the desorber from an open position to a closed position. The desorber further includes a heater configured to slide with the cap toward the inlet in response to the user actuation and vaporize the samples while the desorber is in the closed position.

In some embodiments, the invention provides a visibly detectable performance reference compound for use in a passive sampling device to detect an analyte of interest (and/or the amount of the analyte of interest) in an environment. In some embodiments, the invention provides a passive sampling device comprising a visibly detectable performance reference compound for use in detecting an analyte of interest (and/or the amount of the analyte of interest) in an environment. In some embodiments, the invention provides a kit comprising a first visibly detectable performance reference compound and a second visibly detectable performance reference compound for use in a passive sampling device to detect an analyte of interest (and/or the amount of the analyte of interest) in an environment. In some embodiments, invention provides a method to detect an analyte (and/or the amount of the analyte) in an environment using a passive sampling device comprising a visibly detectable performance reference compound.

Despite the desire to measure the composition and concentration of the microparticles included in a gaseous body sample serving as the measurement target, there is a problem that measurement cannot be performed accurately due to the effect of substances other than the gaseous body sample adsorbing to a trapping body of the analyzing apparatus that traps the microparticles, for example. Therefore, provided is a microparticle composition analyzing apparatus that analyzes composition of microparticles contained in a gaseous body sample, comprising a gas analyzer and a control section that sequentially introduces into the gas analyzer a comparative gas and a sample gas caused by the microparticles generated by irradiating the gaseous body sample with a laser.

A method of determining a flow rate of airborne matter of a plume from an emission source through a notional surface. The method comprises obtaining a plurality of mass ratio measurements along a sampling surface and determining a mass flow rate of the airborne matter of the plume through at least a portion of the notional surface based at least in part on the plurality of mass ratio measurements, wherein the sampling surface and the notional surface are non-parallel.

A method of determining a flow rate of airborne matter of a plume from an emission source through a notional surface. The method comprises obtaining a plurality of mass ratio measurements along a sampling surface and determining a mass flow rate of the airborne matter of the plume through at least a portion of the notional surface based at least in part on the plurality of mass ratio measurements, wherein the sampling surface and the notional surface are non-parallel.

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 controlled environment system for standardizing initial conditions in CO.sub.2 sorbent characterization is disclosed. The system includes an enclosure that is sealable and a humidity control subsystem having a vessel inside the enclosure, with the vessel containing a saturated salt solution. The system also includes a gas control subsystem having a CO.sub.2 sensor within the enclosure and an electric valve through which the interior of the enclosure is in fluidic communication with a gas supply. The system includes a microcontroller communicatively coupled to the CO.sub.2 sensor and the electric valve, and configured to function in a gas control-feedback loop, driving the electric valve in response to the CO.sub.2 sensor. The saturated salt solution is chosen and the gas control-feedback loop of the gas control subsystem is configured such that a characterization loading condition is established and maintained within the interior of the enclosure while the enclosure is sealed.

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.

Systems and methods are provided for improving the fabrication of silicon pillar arrays and porous top electrodes for trace vapor preconcentration and partial separation. In an embodiment, the silicon pillar arrays are fabricated using photolithography or maskless photolithography combined with a dry etching process. Importantly, this process is more reproducible and scalable than the past fabrication method and yields better device performance.