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Pretreatment method used for effectively extracting volatile organic compound

An organic compound and volatile technology, which is applied in the field of pretreatment of sample determination, can solve the problems of unsuitable long extraction time, difficult high temperature extraction, small extraction droplets, etc., so as to reduce sample dosage and extraction time, and increase surface gas-liquid contact The effect of low area and cost

Active Publication Date: 2013-04-03
徐州宏阳新材料科技股份有限公司
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Problems solved by technology

Headspace liquid-phase microextraction (HS-LPME) is to suspend organic solvent droplets above the sample for extraction, but there are also problems such as the extraction agent is mostly organic solvents, the extraction droplets are small, and they are easy to volatilize and even lose during the extraction process. The danger of falling, it is not easy to extract at high temperature, and the extraction time should not be long, etc.

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  • Pretreatment method used for effectively extracting volatile organic compound
  • Pretreatment method used for effectively extracting volatile organic compound
  • Pretreatment method used for effectively extracting volatile organic compound

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[0033] Such as figure 2 As shown in -6, in this example Atractylodes Rhizome is used as a sample, and polyethylene glycol (PEG) is used as a high boiling point solvent. Weigh Atractylodes macrocephala sample (120 mesh) and place it around the inner wall of a flat weighing bottle, measure 1 mL PEG into a small cylindrical cup and place it in the center of the weighing bottle, close the bottle cap tightly, put it into an incubator for extraction, and then use 1 mL reverse The extractant n-hexane back-extracts the analytes in the solvent cup, oscillates and mixes evenly, and then stands still. After the layers are separated, absorb the upper n-hexane layer and inject it into GC-MS for analysis. Chromatographic conditions: HP-5MS column (30 m×25 mm×0.25 μm); carrier gas: high-purity helium (99.999%), flow rate: 0.8 mL min -1 ;Injection port temperature: 250°C; -1 Rise to 160°C, hold for 3 min, and then at 8°C·min -1 Rise to 250°C and keep for 5 min; injection volume: 1 μL. Ma...

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Abstract

The invention discloses a pretreatment method used for effectively extracting a volatile organic compound, belonging to the technical field of sample pretreatment methods. A sample to be treated is put into an extracting device, the volatile organic compound in the sample to be treated is extracted by using a high boiling point extraction agent in 80-140 DEG C, the extraction time is 20-120min, and high boiling point extraction liquid containing the volatile organic compound is obtained, so that the pretreatment method is applicable to separation and extraction of volatile substances. By utilizing the technique, the volatile organic compound is extracted, and the extractant obtained is further subjected to extraction by using an ordinary solvent and is analyzed by using instruments such as gas chromatography-mass-spectrography (GC-MS), so that the extraction efficiency of the volatile substances in the sample is improved. The problem that the liquid drops in classic liquid micro extraction easily volatile and drop off is overcome; and meanwhile the sensitivity of water-soluble substances in oil obtained by using a steam distillation method is improved; and as a result, the pretreatment method is particularly applicable to the pretreatment for analyzing the volatile organic compound by using GC-MS.

Description

technical field [0001] The invention belongs to a pretreatment method for sample determination, in particular to a pretreatment method for effective extraction of volatile organic compounds. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) widely exist in water, food, air, plants, and daily necessities. It is often necessary to use certain sample pretreatment methods to separate and extract them, and then use corresponding instruments for detection. At present, the commonly used extraction methods include steam distillation (SD), ultrasonic extraction (USE), microwave-assisted extraction (MAE), supercritical fluid extraction (SFE), solid-phase microextraction (SPME) and so on. However, the SD extraction takes a long time, and only oil-soluble volatile components can be extracted from the volatile oil; the SPME extraction head is fragile, has a short service life, high cost, and there are problems such as cross-contamination after re...

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Application Information

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IPC IPC(8): G01N30/06
Inventor 刘文涵何晶晶滕渊洁
Owner 徐州宏阳新材料科技股份有限公司
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