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A gas chromatographic detection method for the determination of carbon-containing compounds based on carbon atomic emission spectroscopy

A technique of emission spectroscopy and gas chromatography, which is applied in the field of gas chromatography detection of carbon-containing compounds based on carbon atomic emission spectroscopy, and achieves the effects of wide measurement range, enhanced sensitivity and low consumption.

Inactive Publication Date: 2014-10-01
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As an atomizer, the DBD device is only used for easily atomized elements, such as mercury, arsenic, selenium, tin, antimony and other elements; for organic substances, it can only excite the emission spectra of molecules with low energy requirements, such as halogenated hydrocarbons; currently There is no report on using DBD to excite carbon atomic emission spectroscopy

Method used

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  • A gas chromatographic detection method for the determination of carbon-containing compounds based on carbon atomic emission spectroscopy
  • A gas chromatographic detection method for the determination of carbon-containing compounds based on carbon atomic emission spectroscopy
  • A gas chromatographic detection method for the determination of carbon-containing compounds based on carbon atomic emission spectroscopy

Examples

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Embodiment 1

[0025] In this embodiment, various common volatile organic and inorganic carbon-containing compound samples are selected, and the characteristic atomic emission line of carbon element at 193.0nm produced after DBD is detected, and the carbon-containing compound is mixed with ammonia, water, hydrogen peroxide and other non-carbon-containing compounds. Compound samples are compared to confirm the detection ability of the present invention for carbon-containing compounds. The specific operation steps are: ⑴The sample enters from the gas chromatograph inlet, and enters the DBD device from the discharge gas inlet after separation; ⑵The voltage of the internal and external electrodes of the DBD device is controlled at 2.95kV; ⑶The discharge gas argon passes through the discharge gas port to 400mL min -1Enter; ⑷By controlling the voltage of the electric heating wire, the temperature of the DBD device is controlled to 300°C; ⑸After the sample enters the heated DBD device, it is atomiz...

Embodiment 2

[0027] This example examines the influence of the internal and external electrode voltages on the detection sensitivity of carbon-containing compounds in a DBD device. Referring to the operation steps of Example 1, taking formaldehyde, ethyl acetate, methanol, ethanol, n-propanol, n-butanol and n-pentanol as test objects, the test range of the inner and outer electrode voltages is 1.84-3.25kV. The experimental result of this embodiment sees attached image 3 , thus confirming that the optimum excitation voltage of the present invention is 2.54-3.25kV.

Embodiment 3

[0029] In this embodiment, the effect of the argon flow rate of the discharge gas in the DBD device on the detection sensitivity of carbon-containing compounds is investigated. With reference to the operation steps of Example 1, formaldehyde, ethyl acetate, methanol, ethanol, n-propanol, n-butanol and n-pentanol are used as test objects, and the test range of argon flow rate is 300-900mL min -1 . The experimental result of this embodiment sees attached Figure 4 , thus confirming that the optimum argon flow rate of the present invention is 300~600mL min -1 .

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Abstract

The invention discloses a gas chromatographic detection method for determining a carbon-containing compound based on carbon atomic emission spectroscopy. A dielectric barrier discharge (DBD) device is used as an atomizer and an excitation source of a carbon element in the carbon-containing compound, 193.0nm is selected as a detection wavelength, a charge-coupled device is used for quantitative detection, and detection sensitivity is improved by adopting an auxiliary heating method. The method has the characteristics of high selectivity, high analysis speed, high stability and the like for the detection of the carbon element.

Description

technical field [0001] The invention belongs to a new technology of gas chromatography detection in analytical chemistry and relates to a gas chromatography detection method with high selectivity for carbon elements. Background technique [0002] In a gas chromatograph, the detector is an important component of the detection method. At present, there are dozens of known gas chromatographic detectors, the most common of which include thermal conductivity detector (TCD), hydrogen flame ionization detector (FID), nitrogen phosphorus detector (NPD), electron capture detector (ECD) ), Flame Photometric Detector (FPD), etc. These detectors are used as different gas chromatography detection methods because of their different detection principles. TCD is based on the principle that different analytical components and carrier gases have different thermal conductivity. It is a general-purpose non-destructive concentration detector, which can be applied to the detection of any compon...

Claims

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Application Information

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IPC IPC(8): G01N30/88
Inventor 侯贤灯韩丙军吴鹏蒋小明郑成斌
Owner SICHUAN UNIV
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