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A pretreatment device and method for determining trace phosphine by gas chromatography

A technology of gas chromatography and phosphine, which is applied in the field of pretreatment devices for the determination of trace amounts of phosphine by gas chromatography, and can solve problems such as inability to vaporize phosphine, affect the accuracy of measurement results, and slow heating process of cold hydrazine. , to achieve the effect of reducing gas path loss, overcoming difficulty in storage, and lowering the detection limit

Active Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] With the improvement of chromatographic technology, pH 3 The detection method of phosphine is also constantly improved. In order to meet the requirements of lower detection limit and higher sensitivity, people need to enrich phosphine in a cold trap before using gas chromatography to determine phosphine, and phosphine is easily oxidized. It is required that the cold hydrazine be enriched and quickly vaporized and passed into the gas chromatograph for determination. The general cold hydrazine heating process is relatively slow, and the phosphine cannot be vaporized quickly, thereby affecting the accuracy of the measurement results. Therefore, the phosphine is cold-trapped Rapid heating has always been the pursuit of people

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  • A pretreatment device and method for determining trace phosphine by gas chromatography
  • A pretreatment device and method for determining trace phosphine by gas chromatography
  • A pretreatment device and method for determining trace phosphine by gas chromatography

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Embodiment 1

[0027] A kind of pretreatment device that is used for the determination of trace phosphine by gas chromatography of the present embodiment, such as figure 1 with figure 2 As shown, it is composed of a cold trap enrichment system, a thermal purge desorption system and a fast switching device between the two; 2 and the cold trap box 3 are formed, and the temperature on-line detection and control system composed of the temperature display instrument 4 and the control switch 5 is arranged on the cold trap box to control the temperature in the cold trap pot; the heat purging and desorption system is composed of the hot pot 6, the The heating device consists of a thermal resistance wire 7, a cooling fan 8 and a control box 9. The thermal resistance wire and the cooling fan are arranged in the hot pot for uniform heating, and the temperature on-line detection control system composed of a temperature display and a control switch is set on the control box to control the hot pot. The ...

Embodiment 2

[0030] A pretreatment device for the determination of trace phosphine by gas chromatography in this embodiment is composed of a cold trap enrichment system, a thermal purge desorption system and a cold and hot rapid switching device arranged between them; The cold trap enrichment system is composed of a cold trap pot, a fluorine-free refrigerant compressor of the refrigeration device, and a cold trap box. The temperature on-line detection and control system composed of a temperature display and a control switch is set on the cold trap box to control the temperature in the cold trap pot. Temperature: The thermal purge desorption system consists of a hot pot, a heating device thermal resistance wire, a cooling fan and a control box. The thermal resistance wire and cooling fan are set in the hot pot for uniform heating, and the control box is equipped with a temperature display and a control switch. The composed temperature online detection and control system controls the temperat...

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Abstract

The invention belongs to the technical field of hydrogen phosphide detection, and discloses a pretreatment device and a pretreatment method for determining trace hydrogen phosphide employing a gas chromatography method. The device is composed of a cold trap enrichment system, a heat purging stripping system and a cold and heat rapid switching device, wherein the cold and heat rapid switching device is arranged between the cold trap enrichment system and the heat purging stripping system, and is provided with a reversible partition plate; a hub wound by an enrichment capillary column is arranged on one surface of the partition plate; and switching of pretreatment samples in the enrichment capillary column from the cold trap enrichment system to the heat purging stripping system can be rapidly achieved through reversing of the partition plate. The gas path loss of the hydrogen phosphide in the enrichment and switching process can be reduced through achieving rapid switching of cold trap enrichment and heat purging stripping; the detection limit of hydrogen phosphide is reduced; and the detection accuracy of the hydrogen phosphide is improved.

Description

technical field [0001] The invention belongs to the technical field of phosphine detection, and in particular relates to a pretreatment device and method for gas chromatography to determine trace phosphine. Background technique [0002] Phosphine is a colorless, flammable, poisonous gas with a boiling point of -87.7°C and a melting point of -132.8°C. Since Devai et al first detected phosphine in the volatiles of sewage plants in 1988, phosphine has attracted the attention of more and more scientific researchers. The study of phosphine not only has important geochemical significance for understanding the cycle of phosphorus in nature, but also provides a new solution direction for the increasingly serious problem of water eutrophication. [0003] Phosphine quantitative and qualitative analysis methods mainly include molybdenum blue colorimetry and gas chromatography. Colorimetric method for pH determination 3 Only applicable to PH 3 The gas with higher concentration, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/08
Inventor 牛晓君陆美青洪宇宁李毓佳
Owner SOUTH CHINA UNIV OF TECH
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