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Method for generating concentrated colour spectrum by chromatograph

A chromatograph and chromatographic technology, applied in instruments, scientific instruments, ion exchange regeneration, etc., can solve problems such as difficult to overcome band broadening and concentration dilution, and achieve the effect of improving sensitivity and simplifying the analysis process.

Inactive Publication Date: 2003-06-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned approach is positive for suppressing the broadening and concentration dilution of component bands and improving the detection of trace components, but it is difficult to overcome the phenomenon of band broadening and concentration dilution caused by the chromatographic separation mechanism

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Common Chromatographic Operating Conditions

[0015] Gas chromatography column: Se-30, 50m×0.22mm

[0016] Detector: FID, sensitivity range 10 10 , temperature 250°C;

[0017] Column temperature: program temperature rise to 100°C for 2 minutes, then raise the temperature to 300°C at 15°C / min, and hold for 30 minutes;

[0018] Injector: Split injection, split ratio 60:1, temperature 280°C

[0019] Injection volume: 5μ1;

[0020] Sample: 14 kinds of polycyclic aromatic hydrocarbons, the concentration is in the order of ppm;

[0021] (phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)anthracene, chrysene, benzo(k)fluoranthene, benzo(e)pyrene, benzo(a)pyrene, perylene, indeno(1,2, 3-cd)pyrene, dibenzo(a,h)anthracene, benzo(ghi)perylene, coronene).

[0022] Concentrated chromatographic conditions

[0023] Lower the temperature of the 15cm-long column at the end of the column to 0°C, immediately raise the temperature to 200-300°C every 5 minutes, and then drop to...

Embodiment 2

[0027] Common Chromatographic Operating Conditions

[0028] Gas chromatography column: Se-30, 50×0.22mm;

[0029] Detector: FID, sensitivity range 10 10 , temperature 250°C;

[0030] Column temperature: constant temperature 60°C;

[0031] Injector: split injection, split ratio 60:1, temperature 250°C;

[0032] Injection volume: 0.5μl;

[0033] Sample: Dilute nonane with ethanol.

[0034] Concentrated chromatographic conditions

[0035] Lower the temperature of the 10cm-long column at the end of the column to 0°C, and raise the temperature to 100°C immediately after the peak eluting time of nonane arrives.

[0036] Other conditions are the same as above.

[0037] Results: The peak time of nonane was 15.11min and 15.19min in normal chromatography and concentrated chromatography, respectively; the ratio of peak height was 1:45; the ratio of half peak width was 27:1. Concentration chromatography produced a pronounced concentration effect.

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Abstract

A method for generating concentrated colour spectrum for chromatograph is based on the reality that for existing chromatograph the spectral bands of the components widended and diluted by chromatographic column are between the position near the output of column and the detector, and features that the chromatography is such improved that the cooling and heating devices are arranged at output segment of column until detector and an additional by-pass flowing phase inlet is made to fill the fixed phase having high capacity factor, in order to quantitatively collect said spectral bands, concentrate and instantaneously emit to detector. The improved chromatography is especially suitable for analyzing trace substance with the hig-speed, convenient and correct analysis procedure.

Description

technical field [0001] The invention relates to a method for producing concentrated chromatography by a chromatograph. It belongs to the improved technology of chromatograph. Background technique [0002] During the analysis of samples in existing chromatographs, band broadening and concentration dilution of the separated components in the column inevitably occur. This will not only increase the difficulty of detection and qualitative and quantitative detection of trace substances, but also further increase the work of sample pretreatment. In order to overcome this shortcoming, most of the current instruments are realized by the following methods: improving the sensitivity of the detector; or improving and developing a new type of sampling technology; or improving the column efficiency and reducing the height of the unit tray. The above-mentioned approach has certain enthusiasm for suppressing the broadening and concentration dilution of componen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/08G01N30/02G01N30/26G01N30/50
Inventor 范国梁宋威宋崇林
Owner TIANJIN UNIV