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Method for simultaneously detecting plurality of volatile trace carbonyl compounds in atmosphere

A carbonyl compound and volatile technology, which is applied in the detection field of carbonyl compounds in the atmosphere, can solve the problems such as inability to quantify separately, and achieve the effects of high sensitivity, good separation, and low detection limit

Inactive Publication Date: 2014-09-03
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

Studies have shown that for monocarbonyl compounds, PFPH has more advantages than PFBHA, such as low cost, low detection limit, and easy operation, etc.; but due to the symmetry of the structure, for some multifunctional compounds, such as glyoxal and ethanol Aldehydes, methylglyoxal, and hydroxyacetone, whose PFPH / DNPH derivatives are the same, cannot be quantified separately
At present, there are few studies on the simultaneous detection of monocarbonyl and polycarbonyl compounds at home and abroad. It is of great significance to establish a detection method for simultaneous measurement of monocarbonyl and polycarbonyl compounds in the atmosphere.

Method used

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  • Method for simultaneously detecting plurality of volatile trace carbonyl compounds in atmosphere
  • Method for simultaneously detecting plurality of volatile trace carbonyl compounds in atmosphere
  • Method for simultaneously detecting plurality of volatile trace carbonyl compounds in atmosphere

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Embodiment Construction

[0021] Weigh the single standards of 18 carbonyl compounds and place them in the acetonitrile solution, add 0.5 mmol / L HCl to adjust the pH value to 4, and add 5 times the total amount of PFBHA of the single standard, and place them in a water bath at 35°C for 2 hours. It was fully derivatized and then subjected to liquid-liquid extraction with n-hexane to obtain a mixed standard mother liquor (10 μg / mL) of 18 carbonyl compounds. The mother solution was diluted step by step to obtain 5 standard solutions with concentrations of 0.05, 0.1, 0.5, 1, and 2 μg / mL, respectively. The gas chromatogram of the mixed standard sample is shown in figure 1 shown.

[0022] Sampling tubes coated with the above three derivatizing agents (130, 260, 650 nmol PFBHA) were used, and the sampling tubes of each coating amount were used at four flow rates (20 mL / min, 50 mL / min, 80 mL / min min and 100 mL / min) were collected for 4 hours respectively, and the analysis results were as follows figure 2 s...

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Abstract

The invention relates to a method for simultaneously detecting a plurality of volatile trace carbonyl compounds in the atmosphere. According to the method, a pentafluorobenzyl hydroxylamine (PFBHA) derivative standard sample of 18 carbonyl compounds (16 mono-carbonyl compounds and 2 dicarbonyl compounds) with a certain concentration is prepared. A sample is collected by a self-made glass sampling pipe of a Tenax-TA adsorbent coated by a suitable amount of the PFBHA and a sampling condition is determined; under the condition that the loading amount of the adsorbent is 50mg, the sampling effect is optimal when the coating amount of a derivation agent is 260nmol, the collection flow speed is 50mL / min and the sampling time is 3-5 hours. The method has good separation degree, high sensitivity and low detection limit; the variety of the detected carbonyl compounds is more; the thermal stability of an oxime derivative with the weak polarity, which is generated by reaction, is good; the method is applicable to GC / MS (Gas Chromatograph-Mass Spectrometer) analysis. Furthermore, the method is simple and feasible and can be used for detecting and analyzing atmosphere samples.

Description

technical field [0001] The invention relates to a method for detecting carbonyl compounds in the atmosphere, in particular to a method for simultaneously detecting multiple volatile trace carbonyl compounds in the atmosphere. Background technique [0002] Carbonyl compounds in the atmosphere are an important class of trace organic compounds in the process of atmospheric photochemical reactions, and one of the most important photooxidation products of volatile organic compounds (VOCs) in the atmosphere. important role in. [0003] Carbonyl compounds are very difficult to detect and quantify because of their low content in the atmosphere, strong polarity, and volatile characteristics. Now the commonly used method is to enrich the sorbent tube by coating the derivatizer. Analyze by solvent desorption or thermal desorption. The traditional method for detecting carbonyl compounds in the atmosphere, 2,4-dinitrophenylhydrazine / high performance liquid chromatography (DNPH / HPLC), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 任青青冯艳丽王芳曾翠平仇奕沁姜知明
Owner SHANGHAI UNIV
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