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Method for detecting phthalic acid esters in vegetables planted in soil polluted by vegetable application

A technology of phthalates and polluted soil, which is applied in the field of chemical analysis, can solve the problems of being easily interfered by other impurities, time-consuming, detection neglect, etc., to enhance the interface adsorption performance, prevent low detection rate, and increase contact rate effect

Active Publication Date: 2019-11-19
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Vegetables grown from soil contaminated by PAEs are also an important source of pollution, but their detection is often ignored in the prior art
In my country's national standards and industry standards, the pretreatment technology for the detection of phthalates in samples usually uses direct extraction and then purification detection with adsorption columns. Carelessness will cause detection errors. Due to the impurity of the extracted PAEs, it is easy to be interfered by other impurities during the detection process, which will greatly reduce the accuracy of the detection results.
[0004] A lot of research has been done on the detection methods of phthalates at home and abroad. However, the existing pretreatment technology for the detection of phthalates in agricultural products has the disadvantages of low extraction purity, large interference of impurities, and complicated and time-consuming operations.

Method used

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  • Method for detecting phthalic acid esters in vegetables planted in soil polluted by vegetable application
  • Method for detecting phthalic acid esters in vegetables planted in soil polluted by vegetable application
  • Method for detecting phthalic acid esters in vegetables planted in soil polluted by vegetable application

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Embodiment 1

[0029] This embodiment provides a method for detecting phthalates in vegetables grown in vegetable-polluted soil, comprising the following steps:

[0030] (1) Rough extraction of the sample: take the green vegetables planted on the polluted soil as a sample, wash the surface pollutants, shear and crush, put it into a grinder, add the extraction reagent and grind for 15min, the solid-liquid mass ratio of the sample to the extraction reagent is 4:1, collect the grinding mixture, utilize ethanol to rinse the grinder, and combine the collected flushing liquid with the grinding mixture to obtain a crude extraction slurry; the extraction reagent includes: 6% dimethyl formazan by weight percentage Thiamine, 12% tributyl phosphate, 3% sodium carbonate, 8% ethanol, and the balance is 0.2M phosphate buffer solution with pH=7.5. Utilizing the high polarity of dimethyl methionine, it can quickly release the phthalates remaining in the vegetables from the plant cells, and increase the cont...

Embodiment 2

[0045] This example is basically the same as Example 1, except that the specific photosensitive adsorption filler in the adsorption column is replaced by normal phase silica gel.

Embodiment 3

[0047] This example is basically the same as Example 1, except that the extraction reagent is replaced by phosphate buffer solution containing 10% NaOH.

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Abstract

The invention discloses a method for detecting phthalic acid esters in vegetables planted in soil polluted by vegetable application, which comprises the following steps: (1) rough extraction of samples; (2) extraction of samples; (3) purification of samples; (4) elution of samples; and (5) determination and detection. In the method, phthalic acid esters remained in vegetables can be quickly released from plant cells by an extraction agent, the coarsely extracted slurry can be separated from the extraction agent by using a filter membrane bag, and the coarsely extracted slurry can be in full contact with the extraction agent by the pumped-in inert gas in aeration and agitation. In the purification stage, the target molecular phthalic acid esters in the extraction agent can be specifically adsorbed by a specific photosensitive adsorption filler based on the photosensitive controlled release characteristic, and then desorbed under the action of an eluent. Thus, the test samples are purified, and the spike-and-recovery rate of the detection results is closer to 100%.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis methods, and in particular relates to a method for detecting phthalates in vegetables grown in vegetable polluted soil. Background technique [0002] Phthalates (PAEs), also known as phthalates, are a class of environmental hormone organic substances that can improve the plasticity and flexibility of products. They are often used as plasticizers for plastics, resins and rubber products in industrial production. In some The amount added in the product is as high as 20%-60%. At present, PAEs have been detected in soil, air, water and agricultural products. Due to their stable nature in the environment, long retention time, strong bioaccumulation toxicity, and great harm to the human body and the environment, they are listed as The environment prioritizes the control of pollutants. [0003] Vegetables grown from soil contaminated by PAEs are also an important source of pollution, but thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06G01N30/88
CPCG01N30/06G01N30/88
Inventor 冯艳红王国庆张亚郑丽萍应蓉蓉杜俊洋李勖之孙丽李敏
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA