摘要:
A method and apparatus for providing compositional analysis of hydrocarbon fluids from well samples up to a C30+ fraction. The method includes the steps of heating a sample to a temperature of about 220° F., and collecting the liquid and gaseous fractions therefrom. Both the liquid and gaseous fractions are analyzed by gas chromatography. Additionally, the volume of the gas, and the volume, molecular weight and mass of the liquid are determined. The results are then analyzed to provide a total composition of the hydrocarbon fluids.
摘要:
Disclosed herein are two stage thermal modulators that are useful in the separation of the components of an analyte sample in an analytical method, such as gas chromatography. In some embodiments, the thermal modulators described herein include a modulator column coupled to at least one ground point so as to define a plurality of stages that may be independently temperature modulated. In some cases, the modulator column (or stages thereof adjacent to a ground point) and the ground point are thermally matched, so as to limit or eliminate the formation of a temperature differential between the modulator column and a ground point.
摘要:
A passive sampling apparatus and method for measuring the cumulative mass of a selected gas being transported through a known cross-sectional area, for example, a soil surface, during a chosen period of time, using absorbent material, are described. Two quantities of absorbent material are disposed in a hollow container, such as a pipe section, and spaced apart such that they may be readily separated for analysis. The absorbent material closest to the soil captures the gas leaving the soil. Under reversed flow conditions, for example when the ambient air enters the ground because of fluctuations in atmospheric pressure, the upper absorbent material captures the component of interest entering the apparatus, thereby preventing this gas from entering the lower material and disturbing the measurement. The apparatus can therefore sequester the component of interest without being affected by the direction of gas transport.
摘要:
An apparatus or method for removing water and concentrating an analyte in solution, wherein the concentrated analyte sample is delivered directly to a vial, such as an autosampler vial that is capable of use in a gas chromatography autosampler.
摘要:
The present invention relates to a column tip processing device and a column tip processing method, and its objective is to enhance the contact between a packing and a fluid as a subject to be processed whereby accomplishing a highly efficient reaction as well as an accurate processing, which has a nozzle head having a single or multiple-channeled nozzle, a suction and discharge mechanism, one or more types of column tips in which a packing is enclosed, a stage provided with a fluid housing part group including a plurality of fluid housing parts in which various solutions are or can be housed, and moving means for moving the nozzle head relatively to the fluid housing part group, and also has a controlling part which controls the suction and discharge mechanism and the moving means with regard to quantities, pressure, flow rate, the number of cycles, time or position of the suction or discharge by the nozzle based on a structural requirement relating to the structure of the one or more types of column tips to be fitted to the nozzle and a processing requirement relating to the processing contents involving one or more types of subject fluids subjected to the suction or discharge of the column tips.
摘要:
Methods and systems for analyzing samples, such as gas samples, are described. One method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a smaller volume and provide a pneumatically focused gas sample, and analyzing the pneumatically focused gas sample using any of a variety of analytical techniques. Also disclosed are systems for gas analysis, including systems for analysis of pneumatically focused, and thereby concentrated, gas samples and for analysis of particulate matter in gas samples. Analytical systems constructed within personal computer cases also are disclosed.
摘要:
Sample processing units useful for mixing and purifying materials, such as fluidic materials are provided. A sample processing unit typically includes a container configured to contain a sample comprising magnetically responsive particles, and one or more magnets that are in substantially fixed positions relative to the container. A sample processing unit also generally includes a conveyance mechanism configured to convey the container to and from a position that is within magnetic communication with the magnet, e.g., such that magnetically responsive particles with captured analytes can be retained within the container when other materials are added to and/or removed from the container. Further, a sample processing unit also typically includes a rotational mechanism that is configured to rotate the container, e.g., to effect mixing of sample materials disposed within the container. Related carrier mechanisms, sample processing stations, systems, and methods are also provided.
摘要:
Methods and systems for analyzing samples, such as gas samples, are described. One method comprises providing a gas sample, increasing pressure applied to the gas sample to compress the sample to a smaller volume and provide a pneumatically focused gas sample, and analyzing the pneumatically focused gas sample using any of a variety of analytical techniques. Also disclosed are systems for gas analysis, including systems for analysis of pneumatically focused, and thereby concentrated, gas samples and for analysis of particulate matter in gas samples. Analytical systems constructed within personal computer cases also are disclosed.
摘要:
Systems and methods for cooling a chromatographic column is disclosed generally, comprising heating a chromatographic column, supplying fluid into the column via the inlet end of the column at an inlet pressure, decreasing the temperature of the column, thereby causing the fluid in the column to contract, and controlling the fluid in the column such that the rate at which the fluid in the column contracts does not exceed the flow rate of the fluid supplied to the column. In certain embodiments, the rate of change of the volume of the fluid in the column as the column temperature decreases is modeled, and the rate of contraction of the gas in the column is estimated therefrom. In some embodiments, the column temperature and/or inlet pressure are controlled by a programmable chromatographic oven.
摘要:
This invention provides a chromatographic apparatus comprising an introduction part for a carrier gas as a main mobile phase medium, a sample injection part, a separation column comprising a stationary phase formed by coating a polymeric material, a part for housing the separation column, and a detector. The sample injection part is provided between the carrier gas introduction part and the inlet of the separation column. The chromatographic apparatus further comprises a solvent introduction means for adding a liquid solvent as a second mobile phase medium to a carrier gas and mixing them together, a mechanism for regulating the amount of the carrier gas introduced and the amount of the solvent added, and a mechanism for regulating the temperature of each flow passage. A plurality of clogging liquid stoppers, of which the liquid film thickness is equal to the inner diameter of a capillary column, are partly provided at predetermined intervals within the column in a longitudinal direction of the column. In such a state that a gas phase and a liquid phase are intermittently alternated, a mobile phase medium is moved toward a column outlet and a sample is separated by utilizing distribution between the solvent liquid film of the mobile phase medium and the column stationary phase. There is also provided a chromatographic analytical method utilizing this apparatus. According to this method, a sample can be separated without using any high pressure pump.