A nebulizer for a charged aerosol detection (CAD) system is disclosed. The nebulizer is provided with a spray emitter for generating a spray of droplets within a central region of a spray chamber. The central region is separated from an upper region by a horizontally projecting rib, which defines a passageway between the central and upper regions. The major direction of droplet travel within the upper region is substantially reversed with respect to the major direction of droplet travel within the central region. Larger droplets are unable to negotiate the turn from the central to upper regions and impinge on a rear surface of the spray chamber. Removal of larger droplets has the advantageous effect of enabling the detector to sense a smaller range of particle sizes, which establishes a relatively steady electrical current at the detector.

A system for self-regulating a suppressor includes an ion chromatography suppressor, a power supply for applying an electric potential to the suppressor, and a control unit configured to provide an offset voltage Vos and an applied voltage V.sub.A to the suppressor, measure a current of the suppressor responsive to the offset and applied voltages V.sub.OS and V.sub.A, determine a suppressor state of the suppressor based upon the measured current, and adjust the offset voltage Vos based upon the suppressor state. A method for self-regulating a suppressor is also disclosed.

An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancellation of the confounding effects of pump pulses in a capillary bridge viscometer.

An improved version of the capillary bridge viscometer that compensates for the effect of solvent compressibility is disclosed. A novel, yet simple and inexpensive modification to a conventional capillary bridge viscometer design can improve its ability to reject pump pulses by more than order of magnitude. This improves the data quality and allows for the use of less expensive pumps. A pulse compensation volume is added such that it transmits pressure to the differential pressure transducer without sample flowing there through. The pressure compensation volume enables the cancellation of the confounding effects of pump pulses in a capillary bridge viscometer.

In the present system and method, a conduit from a LC device continuously transports solvent, buffers, and analytes to the inlet of a solvent removal and analyte conversion device which evaporates the solvents, leaving non-volatile analytes for detection. The device comprises a rotating disk. The liquid chromatograph device can be any device using liquid chromatography to separate molecules. The solvents in the LC effluent can include, but are not limited to, water, methanol, acetonitrile, tetrahydrofuran, and acetone. After removal of the volatile components, the non-volatile analytes are converted with a concentrated energy source so that they may be detectable.

In the present system and method, a conduit from a LC device continuously transports solvent, buffers, and analytes to the inlet of a solvent removal and analyte conversion device which evaporates the solvents, leaving non-volatile analytes for detection. The device comprises a rotating disk. The liquid chromatograph device can be any device using liquid chromatography to separate molecules. The solvents in the LC effluent can include, but are not limited to, water, methanol, acetonitrile, tetrahydrofuran, and acetone. After removal of the volatile components, the non-volatile analytes are converted with a concentrated energy source so that they may be detectable.

A wearable health monitoring device includes a band configured to attach the wearable health monitoring device to a user's body; a VOC detection device configured to collect and analyze volatile organic compounds given off from the user's skin to identify specific health-indicative volatile organic compounds indicative of a health condition; and a biomarker sensor configured to detect a biomarker of the user.

A wearable health monitoring device includes a band configured to attach the wearable health monitoring device to a user's body; a VOC detection device configured to collect and analyze volatile organic compounds given off from the user's skin to identify specific health-indicative volatile organic compounds indicative of a health condition; and a biomarker sensor configured to detect a biomarker of the user.

A distributable sampling and sensing instrument for chemical analysis of consumable foods and other agricultural products. The distributable sampling system is used to separate and concentrate the chemicals of interest obtained from samples at remote locations via thermal desorption onto a detachable target substrate that can be analyzed on-site or off-site. The volatile components adsorbed onto the target substrate can be analyzed with specific sensors (e.g., electrochemical sensors) or the assembly can be sent to a central lab and analyzed with conventional chemical instrumentation (e.g., GC-MS). This instrument provides the capability to enable chemical analysis of a wide range of chemical species of interest in a wide range of environments and conditions.

A distributable sampling and sensing instrument for chemical analysis of consumable foods and other agricultural products. The distributable sampling system is used to separate and concentrate the chemicals of interest obtained from samples at remote locations via thermal desorption onto a detachable target substrate that can be analyzed on-site or off-site. The volatile components adsorbed onto the target substrate can be analyzed with specific sensors (e.g., electrochemical sensors) or the assembly can be sent to a central lab and analyzed with conventional chemical instrumentation (e.g., GC-MS). This instrument provides the capability to enable chemical analysis of a wide range of chemical species of interest in a wide range of environments and conditions.