Method for detecting content of plasticizing agent

A plasticizer and content technology, which is applied in the field of Raman and near-infrared spectroscopy detection, can solve problems such as pollution, high background, and impact on the detection limit of analysis and data reliability.

Inactive Publication Date: 2011-11-02
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

The methods mentioned above not only require pretreatment of the samples, but also many valve bodies and pipelines in the gel purification system and analysis system have a large number of plastic or colloidal parts, and these parts have added various plasticizers to varying degrees. The composition of the plasticizer, which caused pollution during the processing of the plasticizer sample, resulting in a high background, affecting the detection limit of the analysis and the reliability of the data

Method used

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  • Method for detecting content of plasticizing agent
  • Method for detecting content of plasticizing agent
  • Method for detecting content of plasticizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The Raman spectrum of green tea beverage samples with different DEHP content was detected by MultiRAM Fourier Raman spectrometer produced by German Bruker Company, and the DEHP content was predicted. The spectrometer uses a laser light source with a wavelength of 1064nm, and sets the spectral scanning range of the spectrometer from 0 to 3600cm -1, measured by immersion. A series of samples with different DEHP contents (calibration samples and test samples) are obtained by adding a certain amount of DEHP to a certain brand of green tea (without PEAs compound) sold in the market, and fully mixing and preparing. The specific values ​​of DEHP content in the sample are 0.520mg / kg, 0.617mg / kg, 0.713mg / kg, 0.810mg / kg, 0.907mg / kg, 1.003mg / kg, 1.100mg / kg, 1.197mg / kg and 1.294 mg / kg. Specific steps are as follows:

[0073] (1) Using FT Raman spectrometer to obtain calibration samples (DEHP content: 0.520mg / kg, 0.617mg / kg, 0.810mg / kg, 1.003mg / kg, 1.197mg / kg and 1.294mg / kg) of g...

Embodiment 2

[0103] The Raman spectra of strawberry jam samples with different DINP contents were detected by the LabRamHRUV ultraviolet laser Raman spectrometer produced by JDbin-yvon Company in France, and the DINP content was predicted. The spectrometer uses a laser light source with a wavelength of 325nm, and sets the spectral scanning range of the spectrometer from 0 to 3600cm -1 , measured non-immersively. A series of samples with different DINP contents (calibration samples and samples to be tested) are obtained by adding a certain amount of DINP to a certain brand of strawberry jam (without PEAs compound) sold in the market, and fully mixing and preparing. The specific values ​​of DINP content in the sample are 0.005mg / kg, 0.053mg / kg, 0.102mg / kg, 0.150mg / kg, 0.199mg / kg, 0.247mg / kg, 0.295mg / kg, 0.344mg / kg and 0.392 mg / kg. Specific steps are as follows:

[0104] (1) Obtain calibration samples (DINP content: 0.005mg / kg, 0.053mg / kg, 0.150mg / kg, 0.247mg / kg, 0.344mg / kg and 0.392mg / kg)...

Embodiment 3

[0125] The DXR intelligent Raman spectrometer produced by American Thermo Fisher Company was used to detect the Raman spectra of milk powder samples with different DNOP contents, and predict the DNOP contents. The spectrometer uses a laser light source with a wavelength of 780nm, and sets the spectral scanning range of the spectrometer from 0 to 3600cm -1, with a resolution of 0.5cm -1 , measured by a non-immersion method. A series of milk powder samples (calibration samples and samples to be tested) with different DNOP contents are obtained by adding a certain amount of DNOP to a certain brand of milk powder (without PEAs compound) sold in the market, and fully mixing and preparing. The specific values ​​of DNOP content in the sample are 0.008mg / kg, 0.057mg / kg, 0.107mg / kg, 0.156mg / kg, 0.205mg / kg, 0.255mg / kg, 0.304mg / kg, 0.353mg / kg and 0.402 mg / kg. Specific steps are as follows:

[0126] (1) Use the DXR intelligent Raman spectrometer to obtain calibration samples (DNOP con...

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Abstract

The invention discloses a method for detecting the content of a plasticizing agent. The method comprises the following steps of: (1) acquiring spectrums of a plurality of calibration samples with known content of the plasticizing agent by using a spectrometer, and preprocessing the spectrums of the calibration samples to obtain the spectrums of the preprocessed calibration samples; (2) processing the spectrums of the calibration samples preprocessed in the step (1) by a data processing method, and building a prediction model of the content of the plasticizing agent; and (3) detecting the spectrums of samples to be detected by using the spectrometer under the color spectrum condition the same as that of the spectrums of the obtained calibration samples, preprocessing the spectrums of the samples to be detected, and inputting the spectrums of the preprocessed samples to be detected into the prediction model to obtain the content of the plasticizing agent in the samples to be detected, wherein the plasticizing agent is a phthalate ester plasticizing agent. The method has the characteristics of environment friendliness and the like, and is simple, convenient, quick, accurate and safe. The samples are not required to be preprocessed, and the method is suitable for online or offline quality control and sample detection of detection mechanisms in factories.

Description

technical field [0001] The invention relates to the field of Raman and near-infrared spectrum detection, in particular to a method for detecting the content of phthalate plasticizers by using Raman or near-infrared spectrum. Background technique [0002] Phthalic Acid Esters (PAEs for short, alias titanate) are generally colorless and transparent oily liquids, hardly soluble in water, but easily soluble in methanol, ethanol, etc. PAEs are mainly used as plasticizers in plastic bags and plastic products to increase product plasticity and strength, and can also play a role in softening. They are widely used in toys, food packaging materials, medical blood bags and hoses, vinyl flooring and wallpaper, cleaners, lubricants, personal care products such as nail polish, hair sprays, soaps and shampoos, and hundreds of other products. However, such compounds have been proven to be harmful to the human reproductive system, and have reproductive toxicity, embryotoxicity and genotoxic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/35G01N21/33G01N21/359
Inventor 王靖岱陈美娟施小妹蒋斌波黄正梁廖祖维阳永荣
Owner ZHEJIANG UNIV
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