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Portable liquid membrane extraction and enrichment device as well as extraction and enrichment method

An extraction, enrichment, portable technology, applied in the fields of chemical analysis and testing and environmental science, can solve the problems of inability to automatically combine detection instruments online, speed up the extraction speed, etc., and achieve the effects of fast and efficient concentration and extraction, flexible operation, and convenient cross-contamination.

Inactive Publication Date: 2011-09-07
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it cannot be used in automatic on-line connection with the detection instrument, and since the extract and the liquid to be extracted in the HFLPME device are static, the solution should be stirred or vibrated in order to speed up the extraction.

Method used

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  • Portable liquid membrane extraction and enrichment device as well as extraction and enrichment method
  • Portable liquid membrane extraction and enrichment device as well as extraction and enrichment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Body: The supporting body part is a cross made of polytetrafluoroethylene or other inert materials. The upper end of the cross is connected with the transmission of the electric stirrer. figure 1 There are vertical Φ10×1mm hollow cavities on both sides of the middle cross near the governor in the horizontal direction, which are respectively the solvent injection port and the solvent outlet, and the upper and lower ends of the solvent inlet and outlet are respectively connected with the syringe and the liquid film. When the device of the present invention is not in use, the solvent inlet and outlet are respectively sealed with plugs to keep it free from pollution. The vertical direction shows a hollow cavity with an inner diameter of 15 mm, an outer diameter of 30 mm, and a length of 150 mm. The outside of the cavity is processed with evenly distributed protruding Φ1mm tooth patterns, the tooth pattern depth is 1mm, and the tooth pattern spacing is 1mm. Commercially av...

Embodiment 2

[0031] The instrument of the invention can be used in combination with a syringe pump, a peristaltic pump and the like on-line. When working, the organic solvent is input into the liquid film by a micro injection pump or a constant flow pump (such as a peristaltic pump), and the flow rate is controlled at 0.01m / s~0.02m / s. A water container is added outside the supporting body of the instrument of the present invention, and a water inlet and a water outlet are provided on the left and right sides of the upper and lower ends of the container. Water samples are continuously output, the flow rate is controlled at 0.01m / s~0.03m / s, and the target is extracted into the organic solvent in the liquid film, so as to achieve the purpose of separation and enrichment. Then the organic solvent enriched with the target is taken out and directly injected into the chromatographic system or spectroscopic system for separation and detection.

Embodiment 3

[0033] In the process of completing the present invention, various performance indexes of the new enrichment system have been tested repeatedly, and the new enrichment system has good stability and reproducibility. The device of the present invention separates and enriches nine haloacetic acids (MCAA, MBAA, DCAA, BCAA, DBAA, TCAA, BDCAA, DBCAA, TBAA) in the water body:

[0034] Use this device to enrich 500ml water sample, the water sample is first acidified with 28ml sulfuric acid and then extracted, the liquid membrane PPQ3 / 2 (made in Germany), 20cm long, 0.2μm pore size, 75% open porosity, the membrane liquid is dihexyl ether+5 % trioctylphosphine oxide, enrichment for 1h, stirring speed 1000r / min, enrichment factor 500-6000. The detection limits were all lower than the values ​​specified in EPA552.2, and the reproducibility was between 1.6% and 10.2%.

[0035] The above results show that the present invention has a higher enrichment factor and extraction efficiency for th...

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Abstract

The invention provides a portable liquid film extraction and enrichment device and an extraction and enrichment method. The device mainly consists of a supporting body, a liquid film and a motor stirrer, the supporting body is of cross shape, the upper part thereof is equipped with a motor, a speed governor and the motor stirrer composed of a stirring rod of a stirring paddle downward connected; the supporting body is internally hollow, the hollow cavity therein is penetrated by the stirring rod, the stirring paddle downward connected to the stirring rod is positioned below the supporting body, the exterior of the supporting body is provided with an outward convex gear, the liquid film is fixed on the outward convex gear, the two sides of the supporting body are horizontally arranged the vertical hollow cavities which respectively serve as a main solvent inlet and a volume outlet; the method comprises: fixedly winding the liquid film in the outward convex gear of the hollow supporting body in a spiral way, with one end of the liquid film connected to the main solvent inlet and the other end leading to a solvent outlet, introducing the solvent into the liquid film through the solvent inlet by an injector, covering the solvent inlet, fixing the motor stirrer by the bracket for soaking part of the liquid film into the sample solution, opening the motor stirrer, regulating the stirring speed to finish the extraction and enrichment under the action of the stirring paddle; the invention has the characteristics of simple and available structure, low cost, flexible operation, no cross contamination, convenient carrying and the like.

Description

technical field [0001] The present invention relates to a portable liquid membrane extraction and enrichment device with a stirring system and an extraction and enrichment method, which are suitable for fast and efficient concentration and extraction of organic compounds, especially for trace analysis and monitoring of organic pollutants, belonging to Fields of chemical analysis testing and environmental science. technical background [0002] In water bodies, the content of organic pollutants such as organic chlorine compounds, halogenated hydrocarbons, haloacetic acids, pesticides, benzidine, polycyclic aromatic hydrocarbons, etc. is generally low, and conventional analytical instruments cannot achieve the sensitivity of direct sample analysis. Therefore, how to enrich the organic pollutants in water has become the prerequisite for accurate analysis of the composition and content of organic matter in water. The earlier developed liquid-liquid extraction is based on the dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D11/04B01D61/38
Inventor 曾莎莎刘锐蔡强张理兵白本帅
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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