JPH07198697A - Line injector - Google Patents

Abstract

PURPOSE:To introduce a sample by providing a metering port inside a hollow capillary without using conventional microsyringe in a sample introduction method for gas chromatograph. CONSTITUTION:A metering port 2 is provided inside a hollow capillary 1, the hollow capillary 1 is passed through an injector body 3 in the direction at right angle to its center axis, and both ends of the capillary 1 are fixed to an arm 5 sliding in parallel with the hollow capillary 1. Also a clearance between the hollow capillary 1 and injector body 3 is filled with packing, and a glass insert 4 and carrier gas injection slit 7 inside it are prepared in the injector body 4. Thus splitless all amount introduction to a capillary column also is enabled. and a carrier gas circuit can be simplified and gas consumption can be saved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for introducing a sample into a gas chromatograph.

[0002]

2. Description of the Related Art Introducing a gas chromatograph sample
When the needle of the microsyringe is pierced by a method of penetrating silicon rubber packing, etc., and when the needle tip reaches the inside of the vaporization chamber,
It is introduced by pushing the plunger of the microsyringe, vaporized in the vaporization chamber and supplied to the column. Since the sample is pushed out by the plunger in the microsyringe, the sample volume depends on the diameter of the plunger,
There was a limit to the introduction of a sample of 1 μl or less. In particular, when a capillary column is used, the sample volume cannot be controlled with a microsyringe, and a split circuit is newly provided in the vaporization chamber to separately control the sample volume entering the column.

[0003]

However, this has the following drawbacks. (A) In the microsyringe, the sample volume depends on the diameter of the plunger, and there is a limit to the introduction of a sample of 1 μl or less. (B) When the capillary column is used, the sample volume cannot be controlled by the microsyringe, and the control adjustment by providing the split gas circuit is required, which is expensive.
Further, the control adjustment work is complicated. (C) The carrier gas is wastefully consumed as split gas. (D) Since the needle of the microsyringe penetrates the silicone rubber packing many times, the silicone rubber packing is pained and consumed. At the same time, fine debris from the silicone rubber packing may enter the vaporization chamber and cause contamination. (E) The needle of a microsyringe is bent due to the adhesive resistance of the silicone rubber packing, often causing an accident. The present invention is intended to solve the inconvenience of the sample introduction method using a microsyringe and to simplify the carrier gas control circuit of the gas chromatograph device to achieve resource saving of gas consumption.

[0004]

Means for Solving the Problems A pair of holes is provided on the side surface of a hollow thin tube (1), and a hollow portion between the holes is used as a measuring port (2), and hollows on both sides of the measuring port (2). Part is filled. The glass insert (4) is inserted into the cylindrical injector body (3), a hole is provided at a position where the injector body (3) and the glass insert (4) are penetrated from the side surface, and the hollow thin tube (1) is passed therethrough. Both ends of the hollow thin tube (1) are fixed to an arm (5) that slides in parallel with the hollow thin tube (1). A packing (6) is placed in the gap between the injector body (3) and the hollow thin tube (1).
To provide. A carrier gas injection slit (7) is provided in the glass insert (4) at a position on the central axis in contact with the hollow thin tube (1). The present invention is a line injector having the above configuration.

[0005]

Next, the operation of the present invention will be described. Hollow thin tube (1)
A pair of holes is provided on the side surfaces of the measurement port, the hollow portion between the holes is used as the measuring port (2), and the hollow portions on both sides of the measuring port (2) are filled. The hollow thin tube (1) provided with the measuring port (2) is installed so as to penetrate through the inside of the injector body (3) sandwiched by the packing (6), and both ends of the hollow thin tube (1) become the hollow thin tube (1). It is fixed to an arm (5) that slides in parallel. By sliding the arm (5), the position of the metering port (2) provided in the hollow thin tube (1) can freely reciprocate between the outside of the packing (6) and the inside of the injector body (3). Therefore, when the sample is injected into the weighing port (2) when it is located outside the packing (6), the sample is held in the weighing port (2) by capillary action, and the arm (5) is slid to slide the weighing port. When (2) is drawn into the injector body (3) and clamped just under the carrier gas injection slit (7) in the glass insert (4), the sample filled in the metering port (2) is filled with the carrier gas injection slit (7). The gas injected from 6) pushes it out vigorously and scatters inside the glass insert (4). The sample scattered in the glass insert (4) rides on the gas flow from the carrier gas injection slit (7), is vaporized, and is entirely introduced into the column.

[0006]

【Example】

(A) Without using the hollow thin tube (1), use a non-hollow bar wire, and measure port (2) at right angles to the bar wire.
May be empty. (B) The outer diameter of the hollow thin tube (1) is 0.6 mm,
Assuming that the diameter of the measuring port (2) is 0.1 mm, it will be approximately 5n.
It is possible to introduce 1 sample and it can be applied to a capillary column. Further, assuming that the thickness of the hollow thin tube (1) is 0.6 mm in outer diameter, 0.2 mm in inner diameter, the diameter of the measuring port (2) is 0.2 mm, and the length of the hollow portion of the measuring port (2) is 2 mm. , About 56 nl of sample can be introduced, and the desired amount of the septum can be adjusted by selecting the thickness of the hollow thin tube (1). (C) As the material of the hollow thin tube (1), a stainless tube or a fused silica capillary tube coated with a heat-resistant resin can be adopted. (D) In addition to the manual injection from the microsyringe, the sample injection into the metering port (2) is also possible by providing a sample injection guide (8) to perform online injection from the sample pipeline, and to the arm (5). If the system incorporates a drive unit, it can easily be developed into an auto sample injector system.

[0007]

【The invention's effect】

(A) The combination of the measuring tube and the injection gas injection plunger enables the minimum sample volume to be on the order of nanoliters, and enables splitless full-volume injection into the capillary column. (B) The need for control and adjustment work for the splitter gas circuit is eliminated. (C) The split gas circuit can be dispensed with, and the resource consumption of the carrier gas can be saved. (D) Silicone rubber packing has no pain and does not wear out. Also, fine dust of the silicone rubber packing does not enter the vaporization chamber and cause contamination. (E) Since the hollow thin tube is supported by the arms at both ends,
There is no need to worry about bending due to the adhesive resistance of the silicone rubber packing. (F) It is possible to develop direct Zen automatic introduction of online samples. (G) An automatic sample injector system can be easily developed by adopting a system in which a drive unit is incorporated in the arm (5).

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of the present invention.

FIG. 2 is a vertical cross-sectional view of the main part of the weighing port of the present invention.

FIG. 3 is a perspective view of the present invention.

[Explanation of symbols]

 1 Hollow thin tube 2 Measuring port 3 Injector body 4 Glass insert 5 Arm 6 Packing 7 Carrier gas injection slit 8 Sample injection guide

Claims (1)

[Claims] 1. A pair of holes is provided on the side surface of a hollow thin tube (1), the hollow portion between the holes serves as a measuring port (2), and the hollow portions on both sides of the measuring port (2) are filled. The glass insert (4) is inserted into the cylindrical injector body (3), a hole is provided at a position where the injector body (3) and the glass insert (4) are penetrated from the side surface, and the hollow thin tube (1) is passed therethrough. Both ends of the hollow thin tube (1) are fixed to an arm (5) that slides in parallel with the hollow thin tube (1). A packing (6) is provided in the gap between the injector body (3) and the hollow thin tube (1). A carrier gas injection slit (7) is provided in the glass insert (4) at a position on the central axis in contact with the hollow thin tube (1).
The line injector configured as described above.