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Quick detection method for resonance light scattering of perfluorooctane sulfonate (PFOS) in environmental water sample

A technology of resonance light scattering and detection method, applied in the field of environmental analysis, can solve the problems of expensive instruments and unfavorable popularization, and achieve the effects of low detection cost, fast method and simple analysis method

Inactive Publication Date: 2011-09-14
SOUTHWEST UNIV
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Problems solved by technology

These methods are not conducive to popularization due to expensive instruments

Method used

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  • Quick detection method for resonance light scattering of perfluorooctane sulfonate (PFOS) in environmental water sample
  • Quick detection method for resonance light scattering of perfluorooctane sulfonate (PFOS) in environmental water sample

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Experimental program
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Embodiment Construction

[0016] 1. Qualitative testing

[0017] Detection method: resonance light scattering analysis.

[0018] Instrument: F-2500 fluorescence spectrophotometer (Hitachi, Japan), used to record and measure resonance light scattering spectrum and intensity.

[0019] Reagents: PFOS standard substance (purity greater than 98.0%, TCI (Shanghai) Chemical Industry Development Co., Ltd.); Rhodamine 6G.

[0020] Working solution: directly use ultrapure water (18.2 M ) to prepare 1.0×10 -4 mol / L PFOS solution and 4.2×10 -4 mol / L rhodamine 6G solution. The acidity of the system is controlled by BR buffer solution, the reagents are all analytical pure, and the experimental water is ultrapure water (18.2 M ).

[0021] Operation method, preliminary analysis:

[0022] Resonant Light Scattering Analysis.

[0023] Add 0.40 mL successively to the 10 mL colorimetric tube with a concentration of 4.2×10 -4 mol / L Rhodamine 6G solution, 1.0 mL pH 3.29 BR buffer, vortex evenly, then add the pr...

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Abstract

The invention discloses a quick detection method for resonance light scattering of perfluorooctane sulfonate (PFOS) in an environmental water sample, and relates to the field of environmental analysis. A resonance light scattering analysis method is adopted in the method. The method comprises the following steps of: sequentially adding 0.40mL of 4.2*10<-4>mol / L rhodamine 6G solution and 1.0mL of butadiene rubber (BR) buffer solution with pH of 3.29 into a 10mL color comparison tube, swirling the solution uniformly, and adding the pretreated water sample to be detected; after uniform swirling mixing, fixing the volume to 10mL by using 18.2Momega ultrapure water, and immediately performing synchronous scanning on a fluorescence spectrophotometer in lambda ex=lambda em, wherein both the excitation slit and the emission slit are 5 nanometers, and the voltage is 400V; recording the scattered spectrum in a wavelength range of 220 to 420 nanometers; and performing preliminary qualitative analysis and quantitative analysis on whether the environmental water sample contains the PFOS according to the scattered signals at the wavelength of 313 nanometers. If the water sample contains the PFOS, the scattering intensity at the wavelength of 313 nanometers is enhanced; otherwise, the scattered signals at the wavelength of 313 nanometers are not changed. The invention is characterized in that: the method for detecting the PFOS in the environmental water sample is simple, quick and sensitive, and low in detection cost.

Description

technical field [0001] The invention relates to the field of environmental analysis, in particular to a method for detecting PFOS in environmental water samples. Background technique [0002] Perfluorooctane sulfonate (PFOS) is a representative substance in many perfluorinated compound families, widely used in textiles, paper, packaging, pesticides, carpets, leather, floor polishing, electroplating, fire extinguishing foams and shampoos and other industrial and civil industries. The final product of catabolism of perfluorinated series compounds containing PFOS in vivo or in the environment is PFOS. PFOS has excellent thermal stability and chemical inertness, and can withstand the metabolism of light, high temperature, chemistry, microorganisms and higher vertebrates and is difficult to degrade. Studies have shown that PFOS does not decompose even if it is boiled in concentrated nitric acid solution for 1 hour, the half-life of hydrolysis is more than 41 years, and the half...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64
Inventor 谭克俊吴飞
Owner SOUTHWEST UNIV
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