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A method for rapid determination of plasticizer content in liquor

A rapid determination of plasticizer technology, applied in the direction of measuring devices, electrochemical variables of materials, instruments, etc., can solve the problems of not meeting the real-time and efficient detection requirements, not being able to directly detect the water phase, prolonging the analysis time, etc., reaching the price Low cost, low equipment price, and accurate test results

Active Publication Date: 2021-03-02
HUBEI UNIV OF TECH
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  • Application Information

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Problems solved by technology

[0003] At present, the most commonly used methods for detecting plasticizers are the national standard GB / T219911-2008 gas chromatography-mass spectrometry technology and high performance liquid chromatography-mass spectrometry technology, which can simultaneously detect 16 kinds of phthalates in food. There are great advantages in terms of sensitivity and specificity, but because the vacuum working state of the mass analyzer cannot directly detect the aqueous phase, it is necessary to perform complex pretreatments on aqueous samples including: extraction, dehydration and other steps, thus extending The analysis time cannot meet the real-time and efficient detection requirements and the detection cost is high
In recent years, studies have explored the feasibility of using near-infrared spectroscopy to quickly detect plasticizers in black tea beverages. The results show that the sensitivity of this method is not good, and the detection limit is about 100ppm.
Zhang MC established a direct / indirect competitive enzyme-linked immunosorbent assay for the detection of several plasticizer residues in liquid food. This method is extremely sensitive and can even reach several ppb, and has high specificity. However, this method requires chemical methods. Antigens are synthesized and labeled with enzymes, then combined with solid-phase antibodies, and then compete with the antigen to be tested. The process is complex and tedious, and the cost is high

Method used

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  • A method for rapid determination of plasticizer content in liquor

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Experimental program
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Embodiment 1

[0022] Three kinds of Daqu wine were selected as objects, and three groups of wine samples were taken for each wine sample, the sample volume was 7mL, and 0μM, 1μM, 5μM diethyl phthalate solution (DEP), and 1mL2 were added to the wine samples respectively. .5 M sodium chloride solution, at -0.1V voltage for constant potential polarization, polarization time 40min. After the polarization is completed, 0.01M potassium ferricyanide solution is added, the graphene electrode is used as the working electrode, the Ag-AgCl electrode is used as the reference electrode, and the graphite carbon rod is used as the auxiliary electrode for impedance measurement. The measured AC amplitude is 10 mV, the frequency range is 1Hz-0.1MHz, and the measurement time is 2min. The impedance diagram is simulated in the CorrTest.CSStudio software to obtain the value of each circuit component and extract the Rct value. Make a graph of the function relationship between Rct value and DEP concentration in t...

Embodiment 2

[0024] The same kind of Daqu liquor was selected as the object, and diethyl phthalate in Daqu liquor was determined according to the method in my country's national standard GB 5009.271-2016 "National Food Safety Standard, Determination of Phthalates in Food". The results of measuring its content were 0.19mg / L, 0.169mg / L, and 0.183mg / L respectively. The results of this method are not much different from those of the national standard method, and the accuracy and practicability of this method can be confirmed.

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Abstract

The invention relates to a method for rapidly determining the content of plasticizer in liquor, in particular to the rapid and accurate determination of the content of plasticizer in liquor by using the principle of electrochemical impedance spectroscopy. This method adopts the method of cathodic constant potential polarization to eliminate interfering substances (metal ions) in liquor, utilizes standard addition method to measure electrochemical impedance spectrum, obtains the impedance map of the plasticizer in liquor in electrochemical impedance spectroscopy, and will get The equivalent circuit is simulated by the impedance spectrum, and the content of plasticizer in liquor is calculated by using the relationship between the Rct value in the circuit components and the known plasticizer concentration. The results prove that electrochemical impedance spectroscopy is a fast, accurate, economical and non-destructive method for determining the content of plasticizers in liquor, which can make up for the shortcomings of the current method and does not require complicated pretreatment. It has laid the foundation for the detection equipment of chemical agent content or industrial online monitoring equipment.

Description

technical field [0001] The invention relates to a method for rapidly determining the plasticizer content in liquor by electrochemical impedance spectroscopy, in particular to realizing the rapid and accurate determination of the plasticizer content in liquor by using the principle of electrochemical impedance spectroscopy. Background technique [0002] Since the liquor industry fell into the plasticizer storm, plasticizers have been detected in beverages, infant drinks, soy sauce, vinegar and other condiments, and even medicines. It can be seen that the harm of plasticizers has completely penetrated into our daily life. in life. Plasticizer, also known as plasticizer, is a plastic softener commonly used in the phthalates (PAEs) chemical industry. It has the characteristics of colorless, odorless, medium viscosity, high stability, and low volatility. Generally, it is often added In plastic wrap, toys and some plastic products. There are many kinds of plasticizers, and the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/416
Inventor 谢逾群万端极刘德富张子蓬陈水胜王超田超张莹李祝常锋毅汪淑廉梅洪葛红梅
Owner HUBEI UNIV OF TECH
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