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The method and application of dual-wavelength resonance Rayleigh scattering method for the determination of perfluorooctane sulfonic acid

A perfluorooctane sulfonic acid and resonant Rayleigh scattering technology, applied in the field of environmental monitoring research, can solve the problems of long analysis time, complicated pretreatment process, and expensive instruments, and achieve high sensitivity, good selectivity, and easy operation Effect

Active Publication Date: 2021-11-02
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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  • The method and application of dual-wavelength resonance Rayleigh scattering method for the determination of perfluorooctane sulfonic acid
  • The method and application of dual-wavelength resonance Rayleigh scattering method for the determination of perfluorooctane sulfonic acid
  • The method and application of dual-wavelength resonance Rayleigh scattering method for the determination of perfluorooctane sulfonic acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The drawing of the standard curve of embodiment 1 perfluorooctane sulfonic acid concentration

[0032] 1.1 Main instruments and reagents

[0033] Main instruments: F-2500 fluorescence spectrophotometer, 2100F transmission electron microscope, precision acidity meter, electronic balance;

[0034] Reagent preparation:

[0035] 2.5×10 -3 mol / L toluidine blue stock solution: Weigh 0.0934g toluidine blue into a 100mL volumetric flask, dilute to the mark with water, mix well, and store in a 4°C refrigerator for later use.

[0036] BR buffer solution: Take 0.04mol / L mixed acid solution of phosphoric acid, boric acid and acetic acid and mix with 0.20mol / L sodium hydroxide solution, and then use a pH meter for calibration.

[0037] Perfluorooctane sulfonic acid stock solution: the prepared concentration is 4.0×10 -3 mol / L perfluorooctane sulfonic acid and stored in a 4°C refrigerator for later use.

[0038] 1.2 Method

[0039] Draw the standard curve of ΔI and PFOS concent...

Embodiment 2

[0041] Embodiment 2 selectivity evaluation

[0042] To evaluate the selectivity of the method, 4×10 pairs of common anions and metal cations were examined -6 mol / L perfluorooctane sulfonic acid determination. After adding the interfering substances in Table 1, the RSD of the change in ΔI value was within ±10%.

[0043] It can be seen from Table 1 that, except for Cu 2+ ,Cd 2+ , Fe 3+ Except for some interference, most other anions and cations do not interfere with the determination, while Cu 2+ ,Cd 2+ , Fe 3+ It can be removed by cation exchange resin, which shows that this method has good selectivity for the determination of perfluorooctane sulfonic acid.

[0044] Table 1 Effect of Coexistence

[0045]

Embodiment 3

[0046] Embodiment 3 mechanism research

[0047] In order to investigate the reaction mechanism, the "toluidine blue" system (2.5×10 -5 mol / L toluidine blue) and "toluidine blue-perfluorooctane sulfonic acid" system (2.5×10 -5 mol / L toluidine blue+4.0umol / L perfluorooctane sulfonic acid+pH4.0's BR buffer solution), the results are as follows image 3 (a) and 3(b).

[0048] from image 3 (a) It can be seen that in the BR buffer solution with a pH value of 4.0, toluidine blue is uniformly dispersed in the system, from image 3 (b) Toluidine blue and perfluorooctane sulfonic acid aggregated after the interaction to form a larger ion association, indicating that in the acidic BR buffer solution, toluidine blue and perfluorooctane sulfonic acid were electrostatically combined, The two form ion associations, which cause the enhancement of the resonant Rayleigh scattering signal.

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Abstract

The invention relates to a method for measuring perfluorooctane sulfonic acid by a dual-wavelength resonance Rayleigh scattering method, belonging to the field of environmental monitoring research. The resonant Rayleigh scattering signal of perfluorooctane sulfonic acid is very weak. The present invention uses toluidine blue and perfluorooctane sulfonic acid to form an ion association under certain conditions, so that the resonant Rayleigh scattering signal is significantly enhanced. , and two characteristic peaks appeared at 345nm and 506nm. Under the selected conditions, there is a good linear relationship between the concentration of PFOS solution and the resonance Rayleigh scattering intensity. Based on this, a dual-wavelength resonance Rayleigh scattering method for the quantitative analysis of PFOS was established. The invention is applicable to the detection of perfluorooctane sulfonic acid in environmental water samples, and has the advantages of simplicity, speed, high sensitivity, strong anti-interference ability and the like.

Description

technical field [0001] The invention relates to a method for measuring perfluorooctane sulfonic acid by a dual-wavelength resonance Rayleigh scattering method, and belongs to the field of environmental monitoring research. Background technique [0002] Perfluorinated compounds are a class of persistent organic pollutants that easily accumulate in living organisms. As one of the most widely used perfluorinated compounds, perfluorooctane sulfonic acid (perfluorooctanesulphonate, PFOS) is chemically very stable and difficult to be decomposed. PFOS can enter and accumulate in organisms through the food chain, and has potential toxic effects on the reproductive system, nervous system, immune system, and endocrine system of organisms. At present, the pollution of perfluorinated compounds has been widely concerned by various countries. Once PFOS is ingested into the body, it will be difficult to be excreted by the organism through metabolism. As it accumulates in the body, it wil...

Claims

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Application Information

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IPC IPC(8): G01N21/51G01N21/64
CPCG01N21/51G01N21/64G01N2021/6495
Inventor 贺锦灿宋嘉怡邱佩佩白研毋福海
Owner GUANGDONG PHARMA UNIV
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