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Plant source volatile organic matter test method

A technology of volatile organic compounds and testing methods, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as incomplete sample analysis, complex instrument structure, and broadened chromatographic peaks, so as to reduce analysis costs and avoid moisture interference , the effect of high sensitivity

Inactive Publication Date: 2008-10-29
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, thermal desorption is a slow process, and long-time thermal desorption sampling will lead to broadening of chromatographic peaks. At the same time, thermal desorption often leads to incomplete analysis of samples and low recovery. The second-stage thermal analysis device of the trap, its principle is to freeze and focus the broad-band sample flow of the first-stage thermal analysis in the cold trap at a low temperature, and then quickly heat "flash" the second-stage thermal analysis to make the sample flow in a The narrow-band form enters the chromatographic system to ensure successful separation and improve the sensitivity of sample analysis, but this type of instrument has a complex structure and high cost

Method used

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  • Plant source volatile organic matter test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of sampling tubes:

[0028] 1) Filling of the sampling tube: Tenax-TA, Carboxen 1000 and Carbosieve SIII were 60 mg, 35 mg, and 35 mg in turn, of which: Tenax-TA, Carboxen 1000 and Carbosieve SIII (purchased in Shanghai, Anpu Company) were adsorbed The agent is filled in a 115 mm × Φ6 mm (outer diameter) glass sampling tube, and the two ends of the sampling tube are filled with 5 mm quartz fibers 13, 14 of which are Tenax-TA fillers, 15 are Carboxen 1000 fillers, and 16 are Carbosieve SIII fillers.

[0029] One end of the sampling tube is straight, and the front end of the other end has a groove, and the part of the sampling tube with the groove is connected to the inlet end of the carrier gas of the thermal desorption instrument (see figure 1 , figure 2 ).

[0030] 2) Aging of the sampling tube: put the filled sampling tube into the thermal desorption instrument, make it age at 250°C for 1 hour, then rapidly raise the temperature to 300°C for 1 hour, and...

Embodiment 2

[0038] Describe the performance of the secondary thermal desorber.

[0039] Take Δ3-carene, a representative compound of plant-derived volatile organic compounds, as an example. Get the Δ3-carene whose concentration is 0.1 mg / ml, and the solvent is 1 microliter of standard solution of methanol, and operate according to the measurement steps of Example 1 to obtain the analysis results (see Figure 3A ); Then, the adsorption tube is operated according to the measurement steps of Example 1 without regeneration and sample introduction, and the analysis results are obtained (see Figure 3B ), a total of 2 chromatograms were obtained. Comparing the two spectral lines A and B in Fig. 3, it can be seen that the analysis efficiency of the secondary thermal analyzer for plant-derived volatile organic compounds can reach more than 96%, reaching the level of a secondary thermal analyzer with a cold trap. structure effect.

Embodiment 3

[0041] Camphene, α-pinene, β-pinene, Δ3-carene, d-limonene, α-terpinene and ocimene are the most representative compounds in plant-derived volatile organic compounds. Take 1 microliter of the mixed standard solution containing the above compounds, the concentration of camphene in the mixed standard solution is 0.01 mg / ml, and the concentration of other compounds is 0.1 mg / ml. Operation by the assay step of embodiment 1, obtain analysis result (referring to Figure 4 ) to obtain a chromatogram, it can be seen from the figure that the second thermal desorption sample injection can keep the capillary chromatographic column with a high separation ability of the chromatographic peaks, and achieve the effect of having a secondary structure of a cold trap. Among them, peak 2 to peak 8 are 2.α-pinene, 3. camphene, 4.β-pinene, 5.Δ3-carene, 6.α-terpinene, 7.d-limonene, 8. ocimene. Figure 4 It is the chromatogram of terpene standard sample analysis in embodiment 4. The analysis condi...

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Abstract

The invention relates to the technical field of the analysis testing method, in particular to a testing method for a plant source volatile organic matter; a sampling tube uses Tenax-TA, Carboxed 1000 and Carbosieve SIII as filling materials for filling; the volatile organic matter is absorbed in the sampling tube and carries out thermal desorption by two times through a secondary thermal desorption instrument; the desorption gas enters a gas chromatograph for separation and measurement with the carrier gas by being coupled on-line from the thermal desorption instrument; the invention adopts three different filling materials, expands the absorbing range of the sample, guarantees the complete collection of the sample, holds high separation capacity for chromatographic peak by adopting a capillary chromatographic column and can not cause the widening of the chromatographic peak; in the process of collecting and analyzing samples, the water disturbance is eliminated and the analysis capacity to the compound is strengthened; low temperature or cooling equipment is not needed, the analysis cost is reduced, the sensitivity of the sample analysis is improved, and the analysis requirement of the plant source volatile organic matter is met, thus reaching the T0-17 standard of an EPA method.

Description

technical field [0001] The invention relates to the technical field of analytical testing methods, in particular to a testing method for plant-sourced volatile organic compounds. Background technique [0002] Volatile organic compounds (volatile organic compounds, VOCs) refer to volatile hydrocarbons with a boiling point range between 50°C and 260°C and a saturated vapor pressure exceeding 133.322Pa at room temperature. VOCs (mainly isoprene and monoterpenes) released by plants during physiological processes account for more than 90% of global non-methane hydrocarbon (NMHC) emissions and are highly chemically active and can affect the chemistry of the lower atmosphere. Composition, promoting the formation of photochemical pollution, and having a potential impact on the greenhouse effect and global change, has been one of the research hotspots in atmospheric chemistry in the past decade. The Environmental Science Center of Peking University simulated the impact of natural so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 史奕李德文陈欣何兴元
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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