SU397840A1 - METHOD FOR GAS CHROMATOGRAPHIC ANALYSIS OF SURFACE-CONNECTING COMPOUNDS - Google Patents

Description

one

This invention relates to gas chromatographic analysis of sulfur-containing substances.

There is a method of gas chromatographic analysis of sulfur-containing compounds based on the use of a flame photometric detector, the principle of which is that the analyte entering the burner of the detector in a stream of nitrogen is burned in an enriched low-temperature hydrogen flame and installed using a photomultiplier tube installed after an appropriate interference filter is recorded a change in the radiation intensity at a wavelength of 394 microns. Radiation in a selected spectral region is due to the formation of Sz particles.

The known method is inconvenient as follows:

1) the signal depends significantly on the structure of the molecules of the analyzed substances (this is due to the different probability of their conversion in the flame to Sz),

2) the sensitivity of the detector to organic sulfur-containing substances is much lower than to inorganic ones;

3) the sensitivity of the detector decreases with increasing temperature of the detector unit, which is necessary when analyzing high-quality compounds.

The proposed method differs from the known one in that the analyzed components are pos2.

After separation on a column, it is converted in a stream of hydrogen to hydrogen sulfide, the reaction products are cooled to a temperature of about 100 ° and then passed through a detector. This increases the detection sensitivity.

The drawing shows a diagram explaining the proposed method. The detection device consists of

0 source of carrier gas 1 (hydrogen), metering device 2, chromatographic column 3, reactor 4, device 5 for cooling gases coming from reactor 4, flame photometric detector 6, integrating register 7 (for example, an integrator with a printing device).

The analyzed mixture of sulfur-containing compounds is divided in a stream of hydrogen into

0 chromatographic column 3, the components of the mixture undergo a conversion in the reactor 4 to hydrogen sulfide and light hydrocarbons. The gas stream exiting reactor 4 is cooled in device 5 to a temperature of

5 flame photometric detector 6. The registration of hydrogen sulfide formed during the conversion of each serodosuler component is carried out using a flame photometric detector 6 connected

0 with integrating recorder 7.

The method makes it possible to increase the sensitivity of determining sulfur-containing compounds and eliminate the dependence of the detector signal on the structure of molecules.

Subject invention

Gas chromatographic method

analysis

containing sulfur-containing compounds, in separating the analyzed mixture on a chromatographic column and registering the components of the mixture with a flame photometric detector, characterized in that, to increase the sensitivity of detection, the analyzed components after the separation on the column are converted in a hydrogen stream to hydrogen sulfide, the reaction products are cooled to temperatures of about 100 ° C and then passed through the detector.