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Rapid colorimetric detection method of di(2-ethylhexyl)phthalate

A technology of phthalic acid di and ethylhexyl, which is applied in the field of chemical analysis and detection, can solve the problems of high professional technical requirements, expensive instruments, and long time consumption, and achieve strong identification and quantification capabilities, rapid response, and simple preparation methods Effect

Active Publication Date: 2020-08-04
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have the advantages of high sensitivity and small cross-interference, but at the same time have the disadvantages of time-consuming, expensive instruments, and high professional technical requirements.

Method used

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  • Rapid colorimetric detection method of di(2-ethylhexyl)phthalate
  • Rapid colorimetric detection method of di(2-ethylhexyl)phthalate
  • Rapid colorimetric detection method of di(2-ethylhexyl)phthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of porphyrin nanorod based on four-(4-pyridyl) zinc, its preparation method comprises the steps:

[0031] Weigh 0.0023g tetrakis-(4-pyridyl) zinc porphyrin and dissolve it in 3mL tetrahydrofuran solution, and ultrasonically dissolve it fully for 10 minutes; add 2.8 The concentration in mL is 1.2×10 - 2 mol / L tetrakis-(4-pyridyl) zinc porphyrin tetrahydrofuran solution, reacted at 37°C for 50 minutes, cooled naturally and left to age for 5 days to make it stable, and then placed in a refrigerator at 0-4°C to stop aging reaction to obtain a self-assembled solution containing porphyrin nanorods.

[0032] Four-(4-pyridyl) zinc porphyrin nanorod self-assembly solution (concentration of 0.8 × 10 -4 mol / L) for transmission electron microscope characterization, the results show that the resulting product morphology is a long rod, long 244.23 ± 2nm, diameter 71.83 ± 2nm (see figure 1 ).

[0033] In a 1.4mL cuvette, add 500 μL of the self-assembly solution (concentrat...

Embodiment 2

[0035] A kind of rapid colorimetric detection method of bis(2-ethylhexyl) phthalate, its flow chart is shown in image 3 , the self-assembly solution gained in Example 1 is applied to detect bis(2-ethylhexyl) phthalate in tea water, specifically comprising the following steps:

[0036] The concentration of 100 μL of bis(2-ethylhexyl) phthalate is 5-100 mg / L of tea water base and 700 μL of four-(4-pyridyl) zinc porphyrin stick obtained in Example 1 diluted 100 times. Self-assembly solution (zinc porphyrin rod concentration is 0.8 × 10 -6 mol / L), and supplemented with tea water base to the volume of the obtained solution system is 1mL, then mixed and reacted for 7min, and then carried out ultraviolet-visible spectrum measurement in the range of 350-700nm, respectively measured under the same zinc porphyrin rod concentration conditions, Introduce the absorbance of the solution system obtained before and after bis(2-ethylhexyl) phthalate, and select the corresponding absorbance c...

Embodiment 3

[0040] A rapid colorimetric detection method for di(2-ethylhexyl) phthalate, the self-assembly solution obtained in Example 1 is applied to detect bis(2-ethylhexyl) phthalate in the fruit drink matrix Ester, specifically comprises the steps:

[0041] 100 μL of bis (2-ethylhexyl) phthalate concentration is the fruit drink base of 5-115mg / L and 800 μ L of embodiment 1 gained four-(4-pyridyl) zinc porphyrin rod self-assembly solution (zinc The concentration of porphyrin rods is 0.8×10 -6 mol / L), and supplemented with fruit beverage base to the volume of the obtained solution system is 1mL, then mixed and reacted for 7min, and then measured by UV-visible spectrum in the range of 350-700nm, and the corresponding absorbance change value under the condition of 460nm wavelength was selected to establish its Linear relationship with bis(2-ethylhexyl) phthalate concentration.

[0042] The results show that the absorbance change value in the fruit beverage matrix is ​​0.02-0.17, and th...

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Abstract

The invention belongs to the technical field of chemical analysis and detection, provides a tetrakis-(4-pyridyl) zinc porphyrin nanorod modified based on dodecyl ammonium bromide for the first time, and constructs a rapid colorimetric detection method of di(2-ethylhexyl)phthalate. Compared with traditional detection methods based on mass spectrometry, chromatography and the like, the method has the advantages of being easy to prepare and operate, rapid in reaction, high in recognition and quantification capacity on the di(2-ethylhexyl)phthalate, high in sensitivity, high in response speed andthe like, and a brand-new thought can be provided for low-cost and efficient determination of the di(2-ethylhexyl)phthalate.

Description

technical field [0001] The invention belongs to the technical field of chemical analysis and detection, and in particular relates to a rapid colorimetric detection method for bis(2-ethylhexyl) phthalate. Background technique [0002] Bis(2-ethylhexyl) phthalate, also known as dioctyl phthalate, DOP, DEHP, and dioctyl phthalate, is mainly composed of a rigid planar aromatic ring and two aliphatic chains, and is often used as plasticizer. Bis(2-ethylhexyl) phthalate has been identified as the fourth type of toxic chemical substance, its toxicity is 30 times that of melamine, it is forbidden to add in food, and it is mainly used in various plastic products or plastic packaging bags at present , including cosmetics, children's toys, pharmaceutical products, beverage plastic bottles and rubber and other fields. However, in order to reduce costs and increase their own interests, some enterprises extend the shelf life of food by adding large doses of high-concentration bis(2-ethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/78G01N1/28
CPCG01N1/28G01N21/3103G01N21/78
Inventor 付海燕韦柳娜陈亨业时琼兰薇佘远斌
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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