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Method for Determination of Plasticizer Content in Water Samples by Hollow Fiber Membrane Microextraction Combined with Flash Gas Chromatography

A technology of fiber membrane and flash gas, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of low extraction efficiency, achieve the effect of less extraction steps, good sample purification ability, and avoid cross-contamination

Active Publication Date: 2021-04-06
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Traditional detection methods generally use organic solvent ultrasound, vibration or Soxhlet extraction to extract plasticizers in products. Because the extraction efficiency is low, only large doses of plasticizers artificially added (in general products) can be detected. The limit of plasticizer is 0.1%, that is 1000mg / kg)

Method used

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  • Method for Determination of Plasticizer Content in Water Samples by Hollow Fiber Membrane Microextraction Combined with Flash Gas Chromatography
  • Method for Determination of Plasticizer Content in Water Samples by Hollow Fiber Membrane Microextraction Combined with Flash Gas Chromatography
  • Method for Determination of Plasticizer Content in Water Samples by Hollow Fiber Membrane Microextraction Combined with Flash Gas Chromatography

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Effect test

Embodiment 1

[0044] The selection of embodiment 1 extraction time

[0045] The longer the extraction time, the more beneficial the target substance to enter the membrane, and increasing the extraction time after reaching equilibrium has little effect on the increase of extraction efficiency. Prolonging the extraction time after equilibration will lead to membrane instability, resulting in a decrease in extraction efficiency. The extraction efficiencies of 10, 20, 30, 40, and 50 min of extraction were investigated respectively. Other experimental conditions were: extraction temperature was 40°C, and stirring rate was 300 rpm. The results show that with the increase of time, the extraction efficiency of the target substance has been significantly improved. When the phthalates reach the extraction equilibrium at about 30 minutes, the extraction efficiency will decrease instead as the time continues to increase, and continuing to prolong the extraction time after the equilibrium will lead to ...

Embodiment 2

[0046] The selection of embodiment 2 extraction temperature

[0047] Raising the temperature can promote the entry of target substances from the water sample to the fiber membrane. However, thermodynamically, adsorption equilibrium is an exothermic process, and the partition coefficient will decrease with increasing temperature, resulting in a decrease in extraction efficiency. The extraction efficiency at the extraction temperature of 30, 40, 50, 60, and 70°C was investigated respectively. Other experimental conditions were: the extraction time was 30min, and the stirring rate was 300rpm. The extraction efficiency is the highest at 50°C, so the extraction temperature of 50°C is selected.

Embodiment 3

[0048] The selection of embodiment 3 stirring speed

[0049] Accelerating the stirring speed can improve the mass transfer process, accelerate the speed of the target substance entering the membrane, and improve the extraction efficiency, but too fast stirring will destroy the structure of the membrane and reduce the extraction efficiency. The extraction efficiency was investigated when the stirring speed was 100, 200, 300, 400, and 500rpm. Other experimental conditions were: the temperature was 50°C, and the extraction time was 30min. The results showed that the extraction efficiency was the highest at 300rpm, so the stirring rate was selected at 300rpm.

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Abstract

The invention provides a method for determining the content of phthalates in water samples by combining hollow fiber membrane microextraction with flash gas chromatography. The hollow fiber solid phase microextraction technology used in the invention is a collection of sampling, Extraction and concentration are integrated, and the environment-friendly sample pretreatment technology with less amount of organic solvent, because the fiber wall hole is small, can prevent the macromolecular substances in the sample from entering the membrane, so this method has a good sample purification ability, At the same time, it also has a strong ability to resist matrix interference. In addition, the cost of the hollow fiber is low, and it can be used for one time to avoid cross-contamination between samples. The method of the invention is simple in pretreatment, high in enrichment coefficient and low in cost.

Description

[0001] (1) Technical field [0002] The invention relates to a method for determining plasticizers in water samples, in particular to a method for determining the content of phthalates in water samples by combining hollow fiber membrane microextraction with flash gas chromatography. [0003] (2) Background technology [0004] Phthalate esters (PAEs) are the most common plasticizers. There are many varieties. It can directly liquefy or become softer by reducing the transition temperature of polymer materials. It is mainly used to enhance the plasticity of plastic products. Elasticity, durability and transparency, adding PAEs to food plastic packaging materials can enhance the extensibility, durability and plasticity of the packaging, so it is often used as an additive for food packaging materials in plastic packaging materials. At present, 15 kinds of PAEs compounds are identified as hazardous substances and their use is restricted. When the plastic packaging containing PAEs di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/062
Inventor 黄忠平黄小丽王丽丽刘会君李国华
Owner ZHEJIANG UNIV OF TECH
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