Method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and application thereof

A technology of perfluorooctane sulfonic acid and ultraviolet spectrum, which is applied in the field of determination of perfluorooctane sulfonic acid and perfluorooctane sulfonic acid in environmental water samples by dual-wavelength ratio ultraviolet spectrometry, which can solve the problem of expensive instruments, Long analysis time, complex pre-treatment process and other problems, to achieve the effect of simple operation, high sensitivity and low cost

Active Publication Date: 2020-02-04
GUANGDONG PHARMA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common detection methods have one or more problems such as expensive instruments, long analysis time, and complicated pretreatment process. Therefore, it is of great significance to establish a simple and rapid method for the detection of PFOS

Method used

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  • Method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and application thereof
  • Method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and application thereof
  • Method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and application thereof

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Embodiment 1

[0032] Embodiment 1. The construction of the method for the determination of perfluorooctane sulfonic acid by the dual-wavelength ratio ultraviolet spectrometry method of the present invention

[0033] (1) UV Spectrum of Perfluorooctane Sulfonic Acid

[0034] 1.1 Main instruments, reagents and methods

[0035] Main instruments:

[0036] U-3010 UV-Vis spectrophotometer, electronic analytical balance, precision acidity meter;

[0037] Reagent preparation:

[0038] Perfluorooctane sulfonic acid stock solution: the final concentration of preparation is 50.0×10 -5 mol / L stock solution of perfluorooctane sulfonic acid and stored in a refrigerator at 4°C for future use. Perfluorooctane sulfonic acid working solution: before use, measure 1.0, 10, 20, 30, 40, 50mL perfluorooctane sulfonic acid stock solution in a 50mL volumetric flask, dilute to the mark with water, mix well, The final concentration is 10, 100, 200, 300, 400, 500 μmol / L perfluorooctane sulfonic acid working soluti...

Embodiment 2

[0073] Example 2, the method and application of the present invention for the determination of perfluorooctane sulfonic acid by dual-wavelength ratio ultraviolet spectrometry

[0074] 1. Method:

[0075] S1 standard sample pretreatment: Add acidic buffer solution to the colorimetric tube in sequence, then add perfluorooctane sulfonic acid standard solution with a concentration of 0-500 μmol / L, and finally add toluidine blue solution, and dilute to 10 mL with triple distilled water , shake well, and stand for 1 min to obtain the ion association compound;

[0076] S2 Drawing of perfluorooctane sulfonic acid standard curve: take 3.0mL of the ion association obtained in step S1 in a quartz cuvette, place it in a UV-visible spectrophotometer, and scan the ultraviolet spectrum, the ultraviolet spectrum is as follows Figure 7 , record the absorbance value A at 632nm of the experimental group adding perfluorooctane sulfonic acid solution 632 Absorbance value A at 632nm of the blank...

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Abstract

The invention relates to a method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and belongs to the field of physical and chemical inspection research. Perfluorooctane sulfonate molecules do not have ultraviolet absorption functional groups and do not have ultraviolet absorption properties. In the method provided by the invention, the ultraviolet absorption generates electrostatic interaction with toluidine blue under acidic conditions to form an ionic associate, the ionic associate shows two characteristic peaks at 632 nm and 502 nm and performs rational absorption, the concentration of a perfluorooctane sulfonate solution has a good linear relationship with an ultraviolet dual-wavelength absorption ratio value under selected conditions, and the dual-wavelength ratio ultraviolet spectroscopy for measuring the perfluorooctane sulfonate is established accordingly. The method provided by the invention is suitable for measuring the perfluorooctane sulfonate in environmental water samples, and has the advantages of simple and convenient operation, high sensitivity, strong anti-interference ability and the like.

Description

technical field [0001] The invention belongs to the field of physical and chemical inspection research, relates to a method for measuring perfluorooctane sulfonic acid by dual-wavelength ratio ultraviolet spectrometry, and is suitable for the determination of perfluorooctane sulfonic acid in environmental water samples. Background technique [0002] Perfluorooctane sulfonic acid is an important and common synthetic perfluorinated organic compound. Due to its hydrophobic and oleophobic properties, high surface activity and extremely stable chemical properties, this compound and related chemicals are widely used in textiles, leather, etc. Products, carpets, furniture and other industrial and commercial fields have been used on a large scale for a long time. However, as people continue to study, it has been found that PFOS has been directly or indirectly discharged into the environment in production and life, is widely distributed in the environment but is difficult to degrade,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/31
CPCG01N21/314G01N21/33
Inventor 贺锦灿张诗韵邱佩佩白研毋福海
Owner GUANGDONG PHARMA UNIV
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