JPS6339646Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a pyrolysis gas chromatograph.
In particular, by configuring the pyrolysis furnace between the carrier gas supply path and the column so that it can be switched and connected to a standard gas metering pipe using an 8-way switch,
This improves analysis accuracy.

Pyrolysis gas chromatographs are often used for the identification and structural analysis of polymeric substances, but it has recently been pointed out that they have problems in identifying and quantifying analytical data. In other words, in order to identify and quantify the standard gas, it is necessary to analyze the standard gas using exactly the same flow path and column as used during the pyrolysis of the sample, but with conventional pyrolysis gas chromatographs, No consideration was given. Specifically, the pyrolysis device section can be removed from the gas chromatograph and the standard sample can be introduced directly into the gas chromatograph using a gas tight syringe, or another gas chromatograph equipped with the same type of column and the same flow path can be used. I was using it. However, this type of analysis inevitably has the drawback that the flow path during thermal decomposition of the sample is too different from that of the standard gas, resulting in large errors.

This idea was devised in view of these circumstances, and its specific configuration is a pyrolysis gas chromatograph equipped with a carrier gas supply path, a pyrolysis furnace equipped with a sample injection part, a column, a detector, etc. in this order. The pyrolysis furnace is connected between the carrier gas supply path and the column through four ports of the eight-way socket, and the standard gas supply path and its discharge path are connected via the other four ports of the eight-way socket. A pyrolysis gas chroma that is configured so that a standard gas metering tube can be connected between the carrier gas supply path and the column instead of the pyrolysis furnace by connecting a standard gas metering tube and switching an 8-way switch. It is a tograph.

In other words, this idea consists of configuring the pyrolysis furnace between the carrier gas supply path and the column so that it can be connected to the standard gas metering tube through an 8-way switch, thereby increasing the analytical flow rate of the sample and standard gas. This makes it possible to make the traces almost the same, thus eliminating differences in retention time, and thus improving analysis accuracy.

This invention will be explained in detail below based on the embodiments shown in the figures. Note that this invention is not limited to this.

In Figure 1, the pyrolysis gas chromatograph 1
is a pyrolysis furnace 5 equipped with a carrier gas supply path 2, ports A and B of an eight-way tank 3, a sample injection part 4, a port C, a port D, a column 6, and a detector 7.
It has a more basic configuration, and further includes a standard gas supply path 8,
The other ports E, port F, standard gas measuring tube 9, port G, port H, and standard gas discharge path 10 of the eight-way pot 3 are connected. Note that 11 and 12 are electromagnetic on-off valves.

The pyrolysis gas chromatograph 1 has the above-mentioned configuration, so that in the state shown in FIG.
and is separated and detected by the detector 7.

Next, operate the electromagnetic on-off valves 11 and 12 of the standard gas supply path 8 and its discharge path 10 to fill the standard gas measuring pipe 9 with standard gas, and then switch the 8-way tank 3 to fill the 8-way tank. The flow path configuration is set to the state shown by the dotted line in FIG. In this way, the standard gas can eventually go to the column 6 through the same flow path as the sample in the 8-way chamber, and the standard gas metering tube 9 can also be of the same configuration as the pyrolysis furnace 5, so the standard gas The analysis flow paths for gas and sample can be almost the same. Therefore, there will be no difference in retention time during identification and quantification, and a significant increase in analytical accuracy can be expected.

Note that when thermally decomposing a sample in an atmosphere other than carrier gas, first 8
A gas source is connected to the standard gas supply path 8 in place of the standard gas source, and the pyrolysis furnace 5 is purged and replaced with sufficient gas. After thermal decomposition is carried out for a certain period of time (usually 1 to 2 minutes), the eight-way pot 3 is placed in the state shown in FIG. 1 and the above-mentioned analysis is carried out. If the atmosphere inside the furnace is to be thermally decomposed in an immobile state for a certain period of time, the eight-way flow path is made into the thin line state shown in FIG. 1.

[Brief explanation of the drawing]

FIG. 1 is a functional explanatory diagram showing one embodiment of a pyrolysis gas chromatograph according to this invention. DESCRIPTION OF SYMBOLS 1...Pyrolysis gas chromatograph, 2...Carrier gas supply path, 3...8-way socket, 4...Sample introduction part, 5...Pyrolysis furnace, 6...Column, 7...
Detector, 8...Standard gas supply path, 9...Standard gas measuring pipe, 10...Standard gas discharge path.

Claims (1)

[Scope of utility model registration request] In a pyrolysis gas chromatograph equipped with a carrier gas supply path, a pyrolysis furnace with a sample injection part, a column, a detector, etc. in this order, the connection of the pyrolysis furnace between the carrier gas supply path and the column is made in an eight-way configuration. At the same time, a standard gas metering pipe is connected between the standard gas supply path and its discharge path through the other four ports of the 8-way port, and the carrier gas supply path is connected by switching the 8-way port. A pyrolysis gas chromatograph configured so that a standard gas metering tube can be connected between the pyrolysis furnace and the column in place of the pyrolysis furnace.