Polycyclic aromatic hydrocarbon detection method based on coffee-ring effect

Abstract

Gold nano particles are synthesized. With a coffee-ring effect of a drying process of the gold nano particles and a strong hydrophobic property of polycyclic aromatic hydrocarbon (PAHs), enrichment of the PAHs on a surface of a gold substrate is achieved, and Raman characteristic peaks of six typtcal PAHs can be observed through a portable Raman spectrometer. A series of tests proves that a sample preparation method and a target pollutant analysis method in the invention are simple in operation and can achieve quick detection of the PAHs in environmental substrates.

Description

technical field The invention belongs to the field of environmental analysis, and in particular relates to a detection method for polycyclic aromatic hydrocarbons. technical background Polycyclic aromatic hydrocarbons (PAHs) are a class of organic compounds containing two or more benzene rings or heterocycles and their substitutes, which are produced when coal, petroleum, wood, tobacco and other organic substances are incompletely burned. PAHs are hydrophobic organic pollutants with extremely low water solubility, high n-octanol-water partition coefficient (Kow), strong lipophilicity, and easy accumulation in organisms. The concentration level of PAHs in nature is very high, and they can enter water bodies and soils through atmospheric deposition. The concentration levels of PAHs in water bodies range from a few to tens of μg L -1 Between hundreds and thousands of μg L of PAHS in soil -1 , while the concentration level of PAHS in the sediment is generally in μg g -1 Magn...

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Problems solved by technology

However, the sample pretreatment process of the above-mentioned detection method is complicated, the cost of experimental equipment is expensive, and the requirements for operating technicians are relatively high.

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