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Ultrasonic reinforced hollow fiber membrane liquid-phase micro extraction technique and device

An extraction technology and extraction device technology, which are applied in the field of measuring liquid phase equilibrium parameters, can solve the problems of poor stability, high equipment requirements, complicated ultrasonic emulsification extraction operation process, etc., and achieve the effect of strong practical value.

Inactive Publication Date: 2011-05-11
TIANJIN POLYTECHNIC UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] To sum up, although the liquid phase microextraction technology has largely solved the problems existing in the traditional extraction technology, its extraction time is still relatively long, usually 25-35 minutes, and it cannot really meet the requirements of fast and efficient; Although the enhanced liquid phase microextraction greatly shortens the extraction time to 5-10min, this method is only suitable for the pretreatment and analysis of charged compounds in the sample solution; while the ultrasonic emulsification extraction process is complex, requires high equipment, and is stable. poor sex

Method used

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  • Ultrasonic reinforced hollow fiber membrane liquid-phase micro extraction technique and device
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  • Ultrasonic reinforced hollow fiber membrane liquid-phase micro extraction technique and device

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Example 1: Using nitrobenzene as a probe compound to test the impact of ultrasound on enrichment efficiency

[0036] The membrane used is a hollow fiber membrane, the membrane pore size is 0.02 μm, the membrane porosity is 40%, and the inner diameter of the hollow membrane tube is 1 mm. Take n-octanol as the extraction phase, and nitrobenzene dilute aqueous solution as the sample solution. Take 50ml of sample solution in a small tubular container, place the hollow fiber membrane in n-octanol for a few seconds, add 25 μL of n-octanol to the membrane, seal both ends of the membrane and place it in a small tubular container, place the tubular A small container is placed directly above the sonicator probe. Turn on the power supply, complete the extraction under ultrasonic enhancement, take samples with a micro-injector, and measure the sample concentration of the extraction phase and the extraction residual phase in a gas chromatograph. figure 2 It is the influence of ul...

Embodiment 2

[0037] Example 2: Comparison of electric field enhanced mass transfer and extraction effect of traditional methods

[0038]Using nitrobenzene as a probe compound to investigate the difference between the electric field enhanced mass transfer and the extraction effect of the traditional stirring method, the specific operation is the same as in Example 2, except that the first group of three groups of comparative experiments applies ultrasonic enhancement with a frequency of 40kHz and a power of 180W; The first group did not apply ultrasonic enhancement, but adopted the traditional shaking flask method; the third group did not apply ultrasonic enhancement, but instead applied magnetic stirring for strengthening. image 3 It is the effect of ultrasonic enhancement on the extraction effect. The experimental results show that the logP values ​​measured by the three methods are the same, but the equilibrium time is 15min, 40min and 35min respectively. The fast and efficient characte...

Embodiment 3

[0039] Embodiment 3: Measure the logP of pure organic compound with this device

[0040] Aniline, nitrobenzene, and toluene were respectively taken as probe compounds, and the n-octanol-water partition coefficients of these pure substances were determined. The operation method is the same as in Example 1, the ultrasonic frequency is 40kHz, the power is 180W, and after extraction for 15min, the concentration of the analyte in the n-octanol phase and the water phase are measured respectively. The calculated n-octanol phase concentration / water phase concentration is the partition coefficient, and the logarithm of the partition coefficient is log P. Use this device to measure the log P of several compounds, see the table below:

[0041]

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Abstract

The invention relates to an ultrasonic reinforced hollow fiber membrane liquid-phase micro extraction technique and an ultrasonic reinforced hollow fiber membrane liquid-phase micro extraction device. In the technique, proper ultrasonic is applied between sample solution 2 and an extraction phase 4, and the mass transfer process of an analyzed component in each phase is reinforced by using the ultrasonic with adjustable frequency and power so as to quicken the balance of the analyzed component between the phases; and the technique is a novel liquid-phase micro extraction technique. Compared with the conventional liquid-phase micro extraction method, the technique fully reflects the characteristics of quickness and high efficiency on the premise of keeping all advantages of the traditional hollow fiber membrane-based liquid-phase micro extraction technique. The technique belongs to a pretreatment and pre-enrichment technique of multiple analysis means, is a method for measuring liquid phase balance parameters, can be widely applied in many fields of environmental engineering, medicament research and development, food safety and the like, and has strong practical value.

Description

technical field [0001] The invention relates to a liquid-phase micro-extraction device based on a hollow fiber membrane under the condition of ultrasonic strengthening and its application technology. It is a pre-treatment and pre-enrichment technology for various analysis methods, and is also a method for measuring liquid phase equilibrium parameters, which belongs to laboratory applications. category. Background technique [0002] Liquid-phase extraction technology is mainly the process of using the difference in solubility of compounds in two different phases (such as organic phase and aqueous phase) to make the compounds reach liquid-phase two-phase equilibrium under certain conditions. However, there are many problems in the traditional extraction process, such as large volume, time-consuming, laborious, easy to form emulsified layer, etc., it is difficult to meet the requirements of rapid equilibrium, high enrichment and miniaturization of modern analysis techniques; in...

Claims

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Application Information

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IPC IPC(8): B01D11/04G01N1/40
Inventor 郭玉高王磊梁淑美杨庆庆
Owner TIANJIN POLYTECHNIC UNIV
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