Study On PAHs Distribution Characteristics And Sorption Mechanism In Huangpu River

As a typical persistent organic pollutant (POPs), polycyclic aromatic hydrocarbons (PAHs) bearing the properties of persistent existence in the environment, refractory to degradation and noxious to living bodies is widely spread in the environment. The study on PAHs distribution character and transfer mechanism in typical aquatic environment is one of the difficulties and hotspots in environmental science research. This paper focused on the serious problem of POPs and studied the representative POPs, low molecular weight PAHs (LMW PAHs). Special research was conducted on the development of pre-treatment and analysis methods for LMW PAHs in aquatic environment, LMW PAHs distribution characters in Huangpu River, and the sorption process and mechanism of phenanthrene, a typical hydrophobic compound, between water and sediment (or humic acid) interface to uncover the existence, distribution, transfer and fate of POPs in aquatic environment which was developed for the study on POPs pollution control and the foundation of relevant environmental law making.This paper developed off-line and on-line methods of solid phase extraction and high performance liquid chromatography (SPE-HPLC) for LMW PAHs in ultra-trace level of drinking water and surface water and compared the two methods, the results were stated as follows: â‘  The optimal conditions for off-line SPE method were: 10% methanol added in 500mL water sample as solvent conditioner, eluting solvent was tetradrofuran, amount of eluting solvent was 5mL with the average recoveries of off-line SPE method for LMW PAHs among 95.22% to 100.8%, relative standard deviations (RSD) among 0.78% to 6.68% and method detection limits ranged from 0.06ng/L to 0.24ng/L. â‘¡ The optimal conditions for on-line SPE method were: C₁₈ as the on-line SPE column for the enrichment of PAHs in 25mL water sample, isocratic elution of 75:25 acetonitrile to water as mobile phase with 5mL/min flow rate with the average recoveries of on-line SPE-HPLC method for LMW PAHs among 92.98% to 102.6%, RSD among 0.82% to 5.76% and detection limits ranged from 0.01ng/L to 0.13ng/L. (3) Comparison results showed that with the improvement of convenience,...