ж青中多环芳烃荧光特征及其浓度梯度下的 响应机制硏究

Polycyclic Aromatic Hydrocarbons (PAHs) in asphalt materials is a type of serious environmental hazard, and the main pollution resource in road engineering. Aiming at the requirement of PAHs rapid detection method in asphalt pavement construction for low environmental hazard, this research concentrated in experiments about PAHs content, fluorescence characteristics, solvent environment impact mechanism and correlation between fluorescence intensity and concentration in different asphalt materials, based on the fluorescence effect of PAHs from condensed ring structure. It is found that coal tar asphalt has a typical aggregation-caused quenching phenomenon and higher fluorescence quantum efficiency. Taking the three solvent environment parameters polarity, viscosity and pH value as the research objects, the optimal solvent environment for the fluorescence phenomenon of PAHs in asphalt materials was explored and established as dimethyl sulfoxide: tetrahydrofuran: deionized water: glycerol = 1 : 1 : 1 : 2. Under the optimal solvent environment, fluorescence intensity and concentration of the three asphalt materials all showed obvious linear relationship. Under the same concentration condition, fluorescence intensity of asphalt material showed positive correlation with the PAHs content. This study proves that the asphalt material has the linear relationship between fluorescence intensity and PAHs concentration, which will provide theoretical basis for the detection of PAHs content in asphalt materials, and support the development of low environmental hazard in construction technology for road engineering.