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A method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants

A technology of alcohol polyoxyethylene ether and surfactant, which is applied in the field of analysis and testing, and can solve the problems of shortening the pretreatment time and so on

Active Publication Date: 2021-04-20
INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of method of analyzing and identifying fatty alcohol polyoxyethylene ether surfactant, overcome the problem that the method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactant in the prior art is less, and existing Compared with the method, this method shortens the pretreatment time and consumes less sample

Method used

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  • A method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants
  • A method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants
  • A method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants

Examples

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Effect test

Embodiment 1

[0045] In this example, the rapid analysis and identification of the relative molecular mass distribution, element composition of each component, alkyl chain length and ethylene oxide polymerization degree of AEO-3 includes the following steps:

[0046] (1) Solution preparation

[0047] Preparation of 2,5-DHB solution: Accurately weigh 0.02000g 2,5-DHB and dissolve it in acetonitrile aqueous solution 7:3 (v / v) to prepare 20mg / mL 2,5-DHB solution;

[0048] Preparation of 2,5-DHB+1mM NaCl matrix solution: Accurately weigh 0.05850g sodium chloride in a 100mL volumetric flask, add water to the mark, shake well, pipette 10μL into 990μL of the above 2,5-DHB matrix to prepare into 2,5-DHB+1mM NaCl matrix solution.

[0049] Sample preparation: Dissolve 1 μL of AEO-3 sample in 1 mL of ultrapure water, and sonicate for 5 minutes to obtain a sample solution. The above matrix solution was mixed with the sample solution at a ratio of 9:1 (v / v), and 1 μL of the mixed solution was dropped ...

Embodiment 2

[0063] Same as Example 1, the difference is:

[0064] (1) Solution preparation

[0065] The molar concentration of sodium chloride in the sodium chloride solution is 0.5mmol / L.

[0066] (2) Experimental conditions

[0067] MALDI conditions: In positive ion mode, the laser energy is 10%, the medium mode spot, the laser frequency is 100Hz, the number of irradiation is 200Shots, and the action path is Random.

[0068] FT-ICR MS conditions: set the sampling size to 512K, the number of accumulations to 64, the harmony trap accumulation time to 0.050s, and the mass-to-charge ratio range to 100-1500Da.

Embodiment 3

[0070] Same as Example 1, the difference is:

[0071] (1) Solution preparation

[0072] Sodium chloride solution is supersaturated sodium chloride solution. The molar concentration of supersaturated sodium chloride solution is 5.43mol / L.

[0073] At room temperature, the solubility of sodium chloride is about 36g / 100g, the mass fraction of saturated sodium chloride solution is 36 / 136, and the density is 1.20g / mL, then the molar concentration of supersaturated sodium chloride solution c=1000*1.20*36 / 136 / 58.5=5.43 mol / L.

[0074] (2) Experimental conditions

[0075] MALDI conditions: In positive ion mode, the laser energy is 50%, the light spot in Medium mode, the laser frequency is 200Hz, the number of irradiation is 1Shots, and the action path is Random.

[0076] FT-ICR MS conditions: set the sampling size to 4M, the number of accumulation times to 1, the harmony trap accumulation time to 0.001s, and the mass-to-charge ratio range to 100-1500Da.

[0077] The result that ...

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Abstract

The invention relates to a method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants. The method comprises the steps of: (1) preparing a mixed matrix solution of 2,5-dihydroxybenzoic acid and sodium chloride; (2) preparation of a sample to be tested: the 2,5-dihydroxybenzoic acid obtained in step (1) The matrix solution mixed with benzoic acid and sodium chloride is mixed evenly with the sample solution to obtain the sample solution to be tested, and the sample solution to be tested is dropped on the sample target plate, and the sample to be tested is obtained after drying; (3) Determination: use matrix-assisted laser desorption Ionization and Fourier transform ion cyclotron resonance mass spectrometry are used to measure the sample to be tested obtained in step (2). The present invention uses MALDI technology to adjust the sample signal through sodium salt ions to give full play to its advantages of no pollution and salt tolerance. Sodium chloride is used to guide the ion peak of the mass spectrogram to be the sodium addition ion peak of the sample, so that the spectrogram Simple, easy to analyze and identify, so as to achieve rapid analysis and identification.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, and relates to a method for analyzing and identifying fatty alcohol polyoxyethylene ether surfactants. Background technique [0002] Fatty alcohol polyoxyethylene ether (Alcohol Ethoxylate, AEO, CmH 2m+1 (CH 2 CH 2 O)nH) has good wetting, decontamination, emulsification, diffusion and other properties, and is the fastest-growing and most used type of non-ionic surfactant in industrial additives. AEO is polymerized from fatty alcohol (lipophilic group) and ethylene oxide (hydrophilic group) with active hydrogen. This type of surfactant is not composed of a single component, but different moles of ethylene oxide addition (EO number) composition of the mixture. The EO number and carbon number of AEO have a great influence on the properties of surfactants. At present, in addition to accurately determining the structure of its lipophilic and hydrophilic functional groups, the analysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64G01N1/28
CPCG01N1/28G01N27/64
Inventor 杨秋霞郭鹏然向章敏
Owner INSTITUTE OF ANALYSIS GUANGDONG ACADEMY OF SCIENCES (CHINA NATIONAL ANALYTICAL CENTER GUANGZHOU)
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