Method for detecting polycyclic aromatic hydrocarbons in environmental water

The invention discloses a method for detecting polycyclic aromatic hydrocarbons in environmental water. A flow injection technology, a pretreatment technology and surface enhanced Raman spectroscopy are combined, a peristaltic pump, a six-way valve and an eight-position valve are used to construct a flow path, a control unit is used to realize automatic control, an organic membrane material is added into the flow path to make the polycyclic aromatic hydrocarbons in the environmental water body enriched on the membrane, then the enriched polycyclic aromatic hydrocarbons are eluted with a smallamount of an organic solvent, and the obtained effluent sample directly enters a detection pool, and is detected by a portable Raman spectrometer. The entire process of the method is fully automatic and is simple to operate, the time period from the enrichment of the polycyclic aromatic hydrocarbons in the environmental water to the final detection is about tens of minutes, and onsite ship-borne detection can be achieved