JPH0427084Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is utilized in a mass spectrometer that uses atmospheric pressure plasma as an ion source. Regarding a sample introduction device.

(Summary of the invention) The purpose of this invention is to stably introduce a sample solution into a plasma discharge tube as a mist with a fine particle size. It consists of a spray chamber that removes particles and a plasma discharge tube that ionizes small-sized mist droplets. By arranging the spray chamber's mist outlet almost perpendicular to the drain hole, it is possible to prevent mist droplets from accumulating between the plasma discharge tube and the spray chamber. Droplets can be stably introduced.

(Prior Art) A conventional configuration is shown in FIG. In Figure 2, 1
Atomize the solution with a nebulizer. Since the mist generated by the nebulizer 1 has irregular particle sizes, the spray chamber 2 condenses the mist droplets with a large particle size and is discharged from the drain 21 hole. The fine mist droplets are carried by the working gas of the nebulizer, taken out from the mist droplet outlet 22, passed through the hollow L-shaped tube 4, and guided to the horizontally arranged plasma discharge tube 3.

(Problems to be Solved by the Invention) According to the prior art shown in FIG. It collides with the tube wall and condenses. As condensation progresses, water droplets accumulate near the spray chamber's mist outlet, making it impossible to supply stable dew to the plasma discharge tube, resulting in extremely unstable measured values.

(Means for solving the problem) The present invention was devised to eliminate the above-mentioned drawbacks, and the means consists of a nebulizer, a spray chamber, and a plasma discharge tube arranged horizontally. By arranging the opening at right angles to the drain hole, the hollow L-shaped tube 4 for introducing mist into the horizontally arranged plasma discharge tube is not required.

(Function) The function of the above structure is that first, the sample solution atomized by the nebulizer condenses and removes large-sized mist droplets in the spray chamber, and the condensed liquid is discharged from the drain hole. On the other hand, mist with a small particle size is taken out from a mist outlet located in the spray chamber at right angles to the drain hole, and introduced into a plasma discharge tube connected to the fog outlet. To achieve the purpose of stably introducing a small mist.

(Embodiment) The following will be described in detail based on the drawings shown in one embodiment of the present invention. In Fig. 1, 1 is a nebulizer, 2
is the spray chamber, 21 is the drain hole, 22
3 is a fog outlet, and 3 is a horizontally arranged plasma discharge tube. The nebulizer 1 serves to atomize the sample solution, and the said mist is introduced into the spray chamber 2 . The spray chamber 2 functions to condense and remove large particles of the introduced mist. The condensed mist with large particle size is discharged from the drain hole 21. The mist from which large particles have been removed is taken out from the mist outlet 22 and introduced into a horizontally arranged plasma discharge tube. The mist introduced into the plasma discharge tube is ionized and analyzed by a mass spectrometer, providing information on the elements and concentrations contained in the sample solution.

(Effect of the invention) According to the above invention, the spray chamber's mist outlet is arranged at right angles to the drain hole, and the sample solution is placed in the horizontally arranged plasma discharge tube without using a hollow L-shaped tube. This solves the problem of conventional technology in which the sample mist condenses inside the hollow L-shaped tube, and allows the sample solution to be stably introduced into the plasma discharge tube as a fine-grained mist, which improves the measured value. It is possible to significantly improve the variation in

[Brief explanation of the drawing]

FIG. 1 shows a block diagram of an apparatus according to the present invention, and FIG. 2 shows a block diagram of a conventional apparatus. 1... Nebulizer, 2... Spray chamber, 3... Plasma discharge tube, 4... Hollow L-shaped tube,
21...Drain hole, 22...Mist outlet.

Claims (1)

[Claims for Utility Model Registration] A nebulizer that atomizes a sample solution; a spray chamber that introduces the atomized liquid sample from the nebulizer in a substantially horizontal direction and condenses the mist with a large particle size; A drain hole provided below the spray chamber for condensing and removing large-sized mist droplets from among the mist droplets atomized by the nebulizer and discharging the condensed liquid; and a drain hole provided at a substantially right angle to the drain hole. and a mist outlet disposed substantially perpendicular to the direction of introduction of the atomized liquid sample from the nebulizer, and a plasma discharge for ionizing small-sized mist droplets taken out from the spray chamber mist outlet. A sample introduction device for an atmospheric pressure plasma mass spectrometer characterized by being composed of a tube.