A sheath flow device for an evaporation light scattering detector comprises an evaporation pipe fastener (110), an evaporation pipe heat insulating component (120), a sheath flow nozzle blocking plate (130), a sheath flow nozzle (140), a sheath flow sleeve (150), a sheath flow outlet piece (170) and a stainless steel spray needle (160). The evaporation pipe fastener, the evaporation pipe heat insulating component, the sheath flow nozzle blocking plate, the sheath flow nozzle, the sheath flow sleeve and the sheath flow outlet piece are concentrically connected orderly from front to back, and all provided with concentric inner holes. Said device is applicable to ELSD sheath flow devices ranging from nanoliter-scale to microliter-scale. On one hand, material particles entering a testing pool are enveloped and aggregated so that the formation of eddy and turbulence can be reduced, the chromatographic peak shape of a sample can be improved and the stability of sample detection can be enhanced; on the other hand, the testing pool can be cleaned so that baseline noise can be reduced and the signal to noise ratio can be increased.

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.

The invention relates to a method and the device which is required for its performing for the determination of the isotope ratio of carbon and/or nitrogen in an aqueous mobile phase which contains a sample. The method comprises the following steps: introduction of the aqueous mobile phase into a reactor (i), heating of the aqueous mobile phase with addition of oxygen in the reactor to a temperature of higher than 600° C. for the formation of a water containing sample gas (ii), reduction of the nitrogen oxides being present in the sample gas as well as removal of the contained oxygen (iii), removal of water from the sample gas by chemical drying and/or membrane gas drying (iv) and introduction of the dried sample gas into an isotope mass spectrometer (v). It is essential for the present invention that the introduction in step (i) is realized by introducing the aqueous mobile phase in a capillary tube which leads into the reactor with a gas mixture of oxygen and at least one inert gas, wherein the mass flow of oxygen and inert gas is regulated or controlled by at least one mass flow controller which is upstream with respect to the introduction and that after step (iv) removed water is actively pumped off.

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, an 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 gas-blowing liquid sample infusing device includes a sample introducing tube 17 made from a liquid-sample inner tube 40 and a nebulizing-gas outer tube 41 for nebulizing and supplying a liquid sample, and an exhaust sealing tube 18 provided on the circumference of the sample introducing tube 17, and a cushion member 43 that is mounted on the opening of a sample container 19 (the body of an infusion container 21), that allows the sample introducing tube 17 to pass through and has a contact surface for contacting the lower end of the exhaust sealing tube 18, and an engaging member (lid) 20 that includes a cushion admitting concave part 42 in which an engaging part 44 that is mounted on the opening of the sample container 19 and prevents the upward movement of the cushion member 43 is provided on the lateral surface of the inner circumference.