SU453618A1 - FLAME-PHOTOMETRIC DETECTOR FOR GAS-CHROMATOGRAPHY - Google Patents

Description

one

The acquisition relates to devices for conducting aerial substances, separated by gas chromatography. It can be used both in the practice of analytical work and in the conduct of scientific research.

Flame photometric detectors for gas chromatographs are known, which contain a Gorepp chamber, which transforms into an atomic emulsion chamber and excites the emission spectra of the samples under study.

The drawback of these devices is the low sensitivity of the determinations, the presence of current highlights, the extinction of the flame, and the introduction of significant amounts of sample samples.

In order to increase the accuracy, reliability and sensitivity in the proposed detector, the torch is formed as a separate combustion caliper connected to the emissive box with a hole whose cross section is smaller than the cross section of the combustion chamber, and the connection of the oxidant channel with the combustion chamber is filled with several OTPS. located along the lateral steppes of the combustion chamber, the channels of the hydrogen supply and the sample are connected to the combustion chamber from the side opposite to the orifice that connects the empress chamber with ameroi burn.

The drawing shows the scheme of the proposed detector.

It consists of the atomic-emissive chamber /, the combustion chamber 2 and the channel 3 connecting them. The hemispherical volume is 4 chambers / closed with glass oxide 5. A quartz tube 6 is inserted into the combustion chamber / through which sample is fed through channels 8 and 9, and hydrogen is fed through channel 7 (through cut-out 10 at the end of tube 6). Channels (1) of the inlet gas and 12 inert gas are connected to the combustion chamber 2 by the channel 13 through the semiring channels 14. In the atomic emission chamber / there is an ignition coil 15 and caial / 6 for connecting the detector to the atmosphere. The light guide 17 is intended for connecting a sensor with a spectral imager.

The detector works as follows. A gas mixture of hydrogen with a sample enters the combustion chamber through the holes in the base of the detector.

The resulting hydrogen homogeneous flame is blown from the edges of the stream of oxidant in the form of oxygen gas jets or air. Due to this supply of oxidant, the main part of the analyzed gas mixture is located in the neutral part of the cortical flameplate, is excited in it and through the opening connecting the combustion chamber to the emission chamber, feeds into it, where

deduction of the spectrum, which is recorded with a photometric device.

Subject invention

A flame photometric detector for gas chromatography, contains an emission chamber with a burner, hydrogen oxidant and irope channels and a spectrophotometric device, characterized in that, in order to improve accuracy, reliability and sense of performance, the following: burner;

In the form of a separate combustion chamber, connected with an emission chamber by an opening, the cross section of which is lower than that of the combustion chamber, and the connection

The oxidizer channel with a combustion chamber is made in the form of several holes, rasiolochnyh but the side walls of the combustion chamber, the channels of the same hydrogen and hydrogen joints to the camera Siorani from the side, and a Boreal hole connecting the emission chamber with the combustion chamber.

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