摘要:
A portable detection device includes a surface sampling probe connected to a mass spectrometer, preferably mounted on a portable cart, and a transfer line for transporting samples from the probe to the mass spectrometer. The surface sampling probe is formed from a circular block or disk of metal such as copper and is provided with various holes in which cartridge heaters are located. The disk is preferably electroplated with nickel and then gold to allow for efficient heat transfer to the surface to be sampled. With this arrangement, in addition to other advantages, the presence of very low volatile or non-volatile materials may be determined.
摘要:
A manipulator apparatus, system and method for measuring analytes present in sample tubes. The manipulator apparatus includes a housing having a central bore with an inlet end and outlet end; a plunger mechanism with at least a portion thereof slideably disposed for reciprocal movement within the central bore, the plunger mechanism having a tubular gas channel with an inlet end and an outlet end, the gas channel inlet end disposed in the same direction as said inlet end of the central bore, wherein the inlet end of said plunger mechanism is adapted for movement so as to expel a sample tube inserted in the bore at the outlet end of the housing, the inlet end of the plunger mechanism is adapted for connection to gas supply; a first seal is disposed in the housing for sealing between the central bore and the plunger mechanism; a second seal is disposed at the outlet end of the housing for sealing between the central bore and a sample tube; a holder mounted on the housing for holding the sample tube; and a biasing mechanism for returning the plunger mechanism to a starting position.
摘要:
The apparatus of the present invention is a combination of a breath interface and an external exposure dosimeter interface to a chemical analysis device, all controlled by an electronic processor for quantitatively analyzing chemical analysis data from both the breath interface and the external exposure dosimeter for determining internal tissue dose. The method of the present invention is a combination of steps of measuring an external dose, measuring breath content, then analyzing the external dose and breath content and determining internal tissue dose.
摘要:
This invention is designed to serve as an interface between a liquid chromatograph and a conventional or tandem mass spectrometer (LC/MS, LC/MS/MS). It may also be used for liquid sampling without prior separation of analytes by a liquid chromatograph. This invention differs from prior art in that vaporization of the analytical sample (LC eluent) occurs through the action of condensing pressurized steam on the exterior of a low thermal mass metal capillary, while the aqueous LC eluent is flowing through the metal capillary. The steam is obtained by heating a small volume of water sealed within the device. LC eluent entering the capillary results in localized cooling and subsequent condensation of the pressurized steam on the outer surface of the capillary. The process of condensation deposits energy to the capillary equivalent to the latent heat of vaporization of water. This energy results in flash vaporization of the LC eluent within the capillary. Condensed water flows along the outer wall of the metal capillary where it is returned to the trapped liquid reservoir for re-vaporization. Energy coupling to the LC eluent is substantially more efficient than methods used in prior art interface devices. This invention minimizes overheating of temperature sensitive analytes separated by the LC and rapidly self compensates for changes in eluent flow or eluent composition without the need for adjustment in operating temperature. This invention eliminates the need for aerosol desolvation prior to ionization.
摘要:
Apparatus and method for providing breath for introduction to a measuring device such as a mass spectrometer. The apparatus includes a mouthpiece for interfacing a subject with the apparatus; a tube for carrying exhaled breath from the subject to the inlet of a mixing chamber; a mixing chamber having an inlet, sample outlet and exit tube, that provides a residence time for the exhaled breath sufficient to mix the breath and provide an adequate sample to the measuring device; and heating apparatus for maintaining the apparatus above a temperature where condensation of vapor occurs.