JPS601556A - Specimen vaporizing chamber of gas chromatograph - Google Patents

Abstract

PURPOSE:To make it possible to completely vaporize a specimen by preventing ingredients to be vaporized from being adsorbed by nonvolatile ingredients through such an arrangement wherein a heating mechanism to be installed to the specimen vaporizing chamber of a gas chromatograph is composed so that it is enabled to heat the vicinity of the carrier gas discharging hole of the gas chromatograph up to a temperature which differs from the temperature of the vicinity of the specimen injecting hole. CONSTITUTION:A specimen is injected by piercing the needle of an injector through the rubber stopper 4 of the specimen vaporizing chamber 1 of a gas chromatograph. The number of winding of a heat generating coil 7 is gradually reduced from portion A to intermediate portion B and portion C in order so that the number of winding of the coil 7 becomes larger at the injecting hole and in the vicinity of a carrier gas injecting hole 2, outer circumferential portion A, and the number of winding of the coil 7 becomes smaller at the outer circumferential portion C in the vicinity of a carrier gas discharging hole 3. By this arrangement, when a liquor is analyzed, for example, vaporization is prevented from becoming incomplete by preventing alcoholic ingredients from being adsorbed by water and extracted ingredients of high boiling point, and ingredients of high boiling point are prevented from being mixed in alcohol, and as a result of this, an accurate analysis can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a sample vaporization chamber for a gas chromatograph.

(B) Conventional technology When a liquid sample containing non-volatile components such as alcoholic beverages is injected into the sample vaporization chamber of a gas chromatograph, for example, the alcohol in the alcohol is adsorbed by the non-volatile components such as the extract, and the alcohol content is not sufficiently vaporized. Even if the sample chamber temperature is set to the desired temperature, the entire amount of alcohol may not vaporize.

In order to prevent this, if the temperature of the sample vaporization chamber is set to be too high, all of the alcohol will vaporize, but at the same time, some of the nonvolatile components will also decompose or vaporize and flow into the column, interfering with the analysis.

(c) Purpose of the Invention The present invention has been made in view of the above points, and is a gas chromatography system that allows components that need to be vaporized to vaporize smoothly without being adsorbed to non-volatile components and without being accompanied by part of the non-volatile components. The purpose is to provide a doggerah sample vaporization chamber.

Another object of the present invention is to provide a sample vaporization chamber for a gas chromatograph that has different internal temperature conditions and supplies only the vaporized components of the necessary sample to the reaction line.

2) Structure of the invention and 17 of the present invention, in a sample vaporizing chamber of a gas chromatograph which is provided with a sample inlet, a carrier gas inlet and an outlet, and has a heating mechanism on the outer peripheral surface, the heating mechanism is connected to the carrier gas. A sample vaporizing chamber of a gas chromatograph is characterized in that the sample vaporization chamber of the gas chromatograph is configured to heat the vicinity of the outlet of the sample to a temperature different from that of the vicinity of the sample inlet.

(e) Examples Hereinafter, examples of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following examples.

FIG. 1 shows a longitudinal cross-sectional view of a sample vaporization chamber (1) of a gas chromatograph.

(2) is a carrier gas inlet, and (3) is an outlet, to which the flow path from the carrier supply section and the flow path to the reaction column are connected, respectively. (4) is a rubber stopper, and the cap (5
) and is attached to the rubber stopper (4).
) becomes the sample injection port, that is, the needle of the syringe is pushed into the rubber stopper (4) to inject the sample.

A heating coil (heater wire) (7) serving as a heating mechanism is continuously wound and attached to the outer peripheral surface (6) of the sample vaporization chamber (1). The heating coil (7) is wound around the sample injection port and the carrier gas introduction port G2.
) are closely spaced, and the carrier gas outlet (3)
It is done progressively more roughly as you move towards the end. That is, the heating coil (7) is configured to heat the vicinity of the carrier gas outlet (3) to a lower temperature than the vicinity of the sample injection port.

Figure 2 shows the temperature gradient of the one shown in Figure 1, and A
The temperature of the part is 200'C1C part J, and the temperature of t100'C1B part is between them.

The sample vaporization chamber (11) is equipped with a heating mechanism as described above.
When the sample is heated, the sample injected from the sample inlet becomes alcoholic if it is an alcoholic beverage. Due to the high temperature, water and some of the extract vaporize near the sample injection port, and as the temperature decreases as it moves closer to the carrier gas outlet (3), the extract is trapped, leaving only the alcohol and water at the carrier gas outlet. (3) and sent to the reaction column.

The heating device 47 may be any suitable heater, and a high loop type heater may be used. As another example, a small-capacity heating coil may be used in the vicinity of the carrier gas outlet (3), and a large-capacity heating coil may be used separately in the vicinity of the sample injection port.

In the above example, the temperature of part C, that is, the outlet port (3) of the carrier gas, is set to 10,000, but the temperature of I00'C is kept at the same temperature as the heating temperature of the reaction column, and Care is taken to ensure that the reaction in the column occurs smoothly.

In addition, glass wool is placed inside the sample vaporization chamber (1).

Filling with perilla, metal wool, etc. increases the vaporization area and condensation trap area, thereby enhancing the vaporization and trapping functions of the sample vaporization chamber (1).

Another embodiment will be explained with reference to FIG.

In this device, the sample vaporization chamber (1) is divided into a first sample chamber (la) at the front stage and a second sample vaporization chamber (1b) at the rear stage via a communication path (8). Vaporization chamber (
1a) is provided with a carrier gas inlet (2) and a sample inlet with a rubber stopper (4), and a second sample vaporization chamber (1a) is provided with a carrier gas inlet (2) and a sample inlet with a rubber stopper (4).
b) is provided with a carrier gas outlet (3).

Then, each sample vaporization chamber (LA), (LB)
A heating coil (7) is attached to the heater 4 independently, and the first sample vaporization chamber (1a) is heated to a high temperature and the second sample vaporization chamber (Ib) is heated to a low temperature. First sample vaporization chamber (
The extract vaporized in 1a) reaches the second sample vaporization chamber (lb) and is trapped.

In both of the above embodiments, the temperature near the sample injection port is heated lower than the temperature near the carrier gas outlet, but it is also possible to heat the sample to the opposite temperature state, for example, for polar samples. is heated to a low temperature to vaporize a specific component, which is further heated to a high temperature to be decomposed and sent to a reaction column.

(f) Effects of the Invention Since the present invention is configured as described above, the sample vaporization chamber of the present invention allows only volatile components to be completely vaporized in a liquid sample containing non-volatile components and sent to the analysis section. Come on,
It becomes possible to trap high-boiling components that are unnecessary for analysis.

[Brief explanation of drawings]

FIG. 1 is a longitudinal end view of an embodiment of the sample vaporization chamber of the present invention, and FIG.
The figure is a graph showing the altitude gradient of the pond shown in FIG. 1, and FIG. 3 is a longitudinal end view of the pond embodiment.

Claims (1)

[Claims] 1. In a sample vaporization chamber of a gas chromatograph that is equipped with a sample inlet and a carrier gas outlet and has a heating mechanism on the outer peripheral surface, the heating mechanism connects the vicinity of the carrier gas outlet to the sample inlet. A sample vaporization chamber of a gas chromatograph, characterized in that the sample vaporization chamber of a gas chromatograph is configured to be heated to a temperature different from that of the surrounding area. 2. The sample vaporization chamber of a gas chromatograph according to claim 1, wherein the vicinity of the carrier gas outlet is heated to a lower temperature than the vicinity of the sample inlet. 3. The sample vaporization chamber of a gas chromatograph according to claim 1, wherein the sample vaporization chamber is a single unit. 4. A patent in which the sample vaporization chamber is divided into two parts, a front stage and a rear stage, via a communication path, with a sample inlet and a carrier gas inlet in the former stage, and a carrier gas outlet in the latter stage. A sample vaporization chamber of a gas chromatograph according to claim 1.