Membrane headspace solvent microextraction method and device

A filter membrane and extraction technology, applied in the field of headspace solvent micro-extraction, can solve the problems of instability, difficult to control the volume of organic droplets, easy to fall off and volatilize, etc., and achieve the effects of simple device, low cost and high concentration multiple.

Inactive Publication Date: 2016-01-20
SHANXI MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume of organic droplets suspended in the air is not easy to control and is unstable, easy to fall off and volatilize, and the reproducibility of the experimental results needs to be further improved and improved

Method used

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  • Membrane headspace solvent microextraction method and device
  • Membrane headspace solvent microextraction method and device
  • Membrane headspace solvent microextraction method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 The present invention combines high performance liquid chromatography to concentrate and measure 4 kinds of trace aromatic compounds reference substances simultaneously

[0031]Take a 10mL vial with a rubber cap, add a certain amount of the reference substance mixed aqueous solution (containing benzene 0.8μg / mL, chlorobenzene 1.7μg / mL, bromobenzene 1.5μg / mL, naphthalene 0.2μg / mL) and put it into a stirring bar (8mm ×4mm), placed on a magnetic stirrer. Cut the washed and dried filter membrane into 1cm square pieces, soak in octanol for about 30s. After the micropores of the filter membrane are filled with the extraction solvent, take out the filter membrane with tweezers, and gently press it on the absorbent paper to wipe off the excess extraction solvent on the surface of the filter membrane. Remove the rubber cap of the vial, insert a sewing needle vertically into the cap, and use tweezers to thread a filter filled with extraction solvent over the needle....

Embodiment 2

[0035] Example 2 The present invention combines high performance liquid chromatography to simultaneously concentrate and measure 4 trace aromatic compounds in a certain water sample

[0036] ①Preparation of water samples Take 100mL of a certain sewage sample in a reagent bottle for use.

[0037] ② The present invention combines high-performance liquid chromatography to simultaneously concentrate and measure 4 kinds of aromatic compounds in sewage. Take a 10 mL vial with a rubber cap and add 5.0 mL of water sample. Put a stirring bar (8mm×4mm) on the magnetic stirrer. Cut the washed and dried filter membrane into 1cm square pieces, soak in octanol for about 30s. After the micropores of the filter membrane are filled with the extraction solvent, take out the filter membrane with tweezers, and gently press it on the absorbent paper to wipe off the excess extraction solvent on the surface of the filter membrane. Remove the rubber cap of the vial, insert a sewing needle verticall...

Embodiment 3

[0039] Example 3 Membrane Headspace Solvent Microextraction Simultaneous Concentration and Determination of 4 Trace Aromatic Compounds in Soil

[0040] ① Preparation of soil samples

[0041] Preparation of liquid samples Take 20.00 g of soil samples beside the highway into a stoppered conical flask, add 100 mL of methanol-water (1+5) mixed solution, extract by ultrasonic for 30 min, let stand and filter, and the filtrate is ready for use.

[0042] Preparation of solid samples Take 20.00 g of soil samples beside the road and put them in a reagent bottle for use.

[0043] ②The present invention combines high performance liquid chromatography to simultaneously concentrate and measure four aromatic compounds in soil. Take a 10mL vial with a rubber cap, add 5.0g of solid soil sample or 1.0mL of soil sample solution (put in an 8mm×4mm stirring bar), Place on a magnetic stirrer. Cut the washed and dried filter membrane into 1cm square pieces, soak in octanol for about 30s. After t...

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Abstract

The invention discloses a method and a device for micro-extracting a filter membrane headspace solvent. The method comprises the following steps of: soaking a cut fiber filter membrane into an extracting solvent to enable the micropores of the filter membrane to be fully filled with the solvent; putting the filter membrane fully filled with the solvent above sample solution, and extracting the volatile target analyte; after that, taking out the filter membrane, and dissolving the target analyte on the filter membrane by a solvent; finally, analyzing and measuring. The device is simple; the materials are easily available; the method is convenient to operate, easy to master, rapid, less in dosage of organic solvent, high in enhancement factor and low in cost; therefore, the method and the device are suitable for separating and enriching trace volatile target analyte or matter which can be transformed into the volatile target analyte in different physical states of complex samples such as environment, food, organisms, traditional Chinese medicine, etc.

Description

technical field [0001] The invention relates to the pretreatment of analytical chemical samples, in particular to a headspace solvent micro-extraction method and device. Background technique [0002] Headspace solvent microextraction is a sample pretreatment method that integrates sampling, extraction, and concentration. It is simple, fast, environmentally friendly, and efficient. Headspace solvent microextraction is to suspend the extraction solvent droplet at the bottom of the needle or hollow fiber tube of the microsampler, so that the solvent is exposed to the headspace of the rapidly agitated sample solution or the flowing gas sample, and the volatile target analyte is extracted. Extraction, concentration and purification. Since in headspace solvent microextraction ① the extraction solvent droplets are suspended in the headspace of the sample phase, this method is suitable for volatile compounds with relatively high vapor pressures in complex samples (environmental, bi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/34G01N1/40
Inventor 白小红胡爽陈璇张汝鑫
Owner SHANXI MEDICAL UNIV
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