Single micro/nano plastic detection method based on Raman spectrum technology
A technology of Raman spectroscopy and detection method, which is applied in the field of environmental pollutant detection, can solve the problems of high price and achieve the effects of increased intensity, good universality, and good application prospects
Pending Publication Date: 2021-06-04
FUDAN UNIV
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There are also a variety of substrates for surface-enhanced Raman spectroscopy, such as the commercialized Klarite substrate, although the effect is better, but the price is expensive
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[0030] The method of the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The scope of protection of the present invention is not limited to the examples.
[0031] The specific gold spray thickness optimization and sample detection process are as follows: figure 1 As shown, the specific steps are as follows:
[0032] (1) Gold spray thickness optimization
[0033] (1) Use a pipette gun to take 4 μL of PS standard sample dilution solution and drop it on the gold-sprayed AAO membrane. Wait for the solution to dry;
[0034] (2) Place the dried gold-sprayed AAO film on the sample device in the laser confocal Raman spectrometer system. Through the movement of the sample device stage and the focusing of the optical microscope objective lens, a clear image of a single microplastic standard sample is obtained. image;
[0035] (3) Turn on the laser, select appropriate laser and acquisition parameters, and collect Raman...
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Abstract
The invention belongs to the technical field of environmental pollutant detection, and particularly relates to a single micro / nano plastic detection method based on a Raman spectrum technology. The method is based on a surface enhanced Raman spectrum technology, a surface enhanced Raman substrate adopts a composite film obtained by sputtering Au on an AAO film, and detection of micro / nano plastic is realized; wherein the thickness of the gold sputtered on the AAO film is 30-70 nm, and the preferable thickness is 50 nm. During detection, an object to be detected is filtered by the composite membrane and detected under a Raman instrument, and a baseline is deducted from an obtained spectrum to obtain a Raman signal of the micro / nano plastic; then the position of the Raman signal peak is analyzed to judge whether the micro-plastic exists or not and judge the type of the micro-plastic. The method disclosed by the invention is relatively good in universality, has the advantages of rapidness, accuracy, stability and the like, and can be used for effectively detecting micro-plastics in samples such as environment and food, and has great application prospects.
Description
technical field [0001] The invention belongs to the technical field of environmental pollutant detection, and in particular relates to a detection method of a single micro / nano plastic. Background technique [0002] The low cost and plasticity of plastic products provide a lot of convenience for people's life. But the resulting environmental pollution problems should not be underestimated. Microplastics refer to plastic particles with a diameter of less than 5 mm, which are small and difficult to distinguish with the naked eye. In terms of source, microplastics can be divided into primary microplastics and secondary microplastics. Primary microplastics refer to small plastic flakes or particles after manufacture, such as soft beads in toothpaste and other daily necessities. Secondary microplastics refer to plastic debris that has been exposed to the outside for a long time and is decomposed under the combined action of light, wind and ocean currents. Microplastics are eve...
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IPC IPC(8): G01N21/65G01N1/34
CPCG01N21/658G01N1/34
Inventor 张立武阮雪君徐冠君巩克栋李克俭刘娟
Owner FUDAN UNIV