Detection method for detecting dioxin and polychlorinated biphenyl

Abstract

The invention discloses a detection method for detecting dioxin and polychlorinated biphenyl. The preparation method comprises the following steps: respectively preparing micro-nano silver particles,a molybdenum sulfide / graphene oxide composite material and magnesium-doped nano zinc oxide with a porous structure; superposing the micro-nano silver particles, the molybdenum sulfide / graphene oxide composite material and the magnesium-doped nano zinc oxide with the porous structure on the surface of the silicon substrate layer by layer to form a composite substrate with a self-cleaning function,and accurately and sensitively detecting dioxin and polychlorinated biphenyl by adopting a surface enhanced Raman spectroscopy technology on the basis of the composite substrate. Through the above mode, the method can effectively improve the intensity of Raman signals and enrich dioxin and polychlorinated biphenyl to be detected on the substrate by utilizing the synergistic effect of all layers ofmaterials on the substrate, so that the detection accuracy and sensitivity are improved; in addition, dioxin and polychlorinated biphenyl can be subjected to photodegradation after detection, self-cleaning of the substrate is achieved, frequent replacement of the substrate is avoided, and the detection cost is reduced; and the detection process is simple to operate, low in time consumption and low in cost, and has relatively high application value.

Description

technical field [0001] The invention relates to the technical field of environmental pollution detection, in particular to a detection method for detecting dioxins and polychlorinated biphenyls. Background technique [0002] Dioxins generally refer to a group of polychlorinated substituted planar aromatic hydrocarbons with similar structures and physical and chemical properties, which belong to chlorinated oxygen-containing tricyclic aromatic hydrocarbons, which have stable chemical properties and high toxicity. Polychlorinated biphenyls are chlorinated aromatics produced by chlorination of biphenyl at high temperature under the action of metal catalysts. Their physical and chemical properties are similar to those of dioxins. thing". Both dioxin and polychlorinated biphenyls are highly toxic and difficult to degrade naturally. They can stay in water for a long time without decomposing, and gradually accumulate and pass in the food chain. They have bioaccumulation and biomag...

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Problems solved by technology

However, this method only uses a single gold nanoparticle as an enhanced substrate, which is difficult to fully capture dioxins and PCBs with strong hydrophobicity, resulting in weak detection signals, which affects the accuracy and sensitivity of the detection results; At the same time, the agglomeration agent NaCl selected by this method has limited adsorption on dioxins and PCBs, and it is difficult to achieve excellent agglomeration effects, resulting in a high detection limit, and it is difficult to detect ultra-trace amounts of dioxins and PCBs. Sensitive detection, the application in actual detection is limited; in addition, it is difficult to effectively remove the dioxin-like pollutants attached to the substrate after detection, and the gradual accumulation of pollutants will affect the detection results, and the substrate needs to be replaced frequently To ensure the accuracy of detection, the detection cost is relatively high

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