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Determination method for light scattering/fluorescence ratio of PFOS (Perfluorooctane Sulfonates) in environment water sample

A technology of 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, high sensitivity and simple analysis method

Inactive Publication Date: 2012-06-20
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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  • Determination method for light scattering/fluorescence ratio of PFOS (Perfluorooctane Sulfonates) in environment water sample
  • Determination method for light scattering/fluorescence ratio of PFOS (Perfluorooctane Sulfonates) in environment water sample

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] 1. Qualitative testing

[0018] Detection method: light scattering / fluorescence ratio analysis.

[0019] Instrument: F-2700 fluorescence spectrophotometer (Hitachi, Japan), used to record and measure resonance light scattering / fluorescence emission spectrum.

[0020] Reagents: PFOS standard substance (purity greater than 98.0%, TCI (Shanghai) Chemical Industry Development Co., Ltd.); Rhodamine B.

[0021] Working solution: directly prepare 1.0×10 with ultrapure water (18.2 MΩ) -4 mol / L PFOS solution and 5.0×10 -4 mol / L rhodamine B solution. BR buffer solution was used to control the acidity of the system, all reagents were of analytical grade, and the experimental water was ultrapure water (18.2 MΩ).

[0022] Operation method, preliminary analysis: light scattering / fluorescence ratio analysis.

[0023] Add 0.2 mL successively to the 10 mL colorimetric tube with a concentration of 5.0×10 -4 mol / L Rhodamine B solution, 0.5 mL pH 1.81 BR buffer, vortex evenly, the...

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Abstract

The invention discloses a determination method for a light scattering / fluorescence ratio of PFOS (Perfluorooctane Sulfonates) in an environment water sample, and in particular relates to the field of environment analysis. The determination method comprises the following steps of: orderly adding 0.2 mL of rhodamine solution B with the concentration of 5.0x10<-4> mol / L and 0.5 mL of BR buffer solution with pH of 1.81 into 10 mL of colorimetric cylinder by adopting a light scattering / fluorescence ratio analysis method, swirling uniformly, and adding a pre-treated water sample to be treated; after swirling uniformly, carrying out constant-volume operation to 5 ml by ultra-pure water of 18.2 MW; after swirling uniformly, instantly exciting on a fluorospectro photometer at a 332 nm place, and scanning an emission spectrum of 220-650 nm to obtain a resonant light scattering / fluorescence emission spectrum, wherein an excitation slit and an emission slit are 2.5 nm and the voltage is 700 V; and carrying out initial quantitative analysis and quantitative analysis to check whether the environment water sample contains PFOS according to a ratio I340 / F596 of a light scattering intensity (I340) at a 340 nm place to a fluorescence intensity (F596) at a 596 nm place. If a light scattering signal at the 340 nm place is enhanced and a fluorescence signal at the 596 nm place is reduced, the water sample contains the PFOS; otherwise, the water sample does not contain the PFOS or the content of the PFOS is lower than a detection limit. The determination method, provided by the invention, is used for PFOS detection in the environment water sample, and has characteristics of simpleness, speediness, sensitiveness and low 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] Perfluorooctanesulfonic acid (PFOS) is one of the typical perfluorinated compounds that has received the most attention in recent years. Due to the hydrophobic and oleophobic characteristics of PFOS, it has been widely used in industrial and civil industries as a surface antifouling treatment agent, intermediate and surfactant. Due to the persistence, bioaccumulation potential, toxicity and wide production and use of PFOS, the breadth and depth of environmental pollution have exceeded people's expectations. pollutants. In view of the hazards of PFOS and related regulations, establishing a simple, rapid and sensitive PFOS analysis and detection method will provide a scientific basis for its environmental pollution monitoring and safety evaluation. [0003] At present, there are mainly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/64G01N21/51G01N1/34G01N1/40
Inventor 谭克俊吴飞代旭
Owner SOUTHWEST UNIV
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