Effects of flow rate and temperature on measuring dissolved PAHs by using semipermeable membrane devices (SPMDs)
报告题目：Effects of flow rate and temperature on measuring dissolved PAHs by using semipermeable membrane devices (SPMDs)
系列：“生态与环境讲坛”系列第 173 讲
报告人：Prof. Chon-Lin Lee
来访单位：National Sun Yat-sen University, Taiwan
摘要：Polycyclic aromatic hydrocarbons (PAHs) are found throughout the environment and are of great concern due to their toxicity, carcinogenicity or mutagenicity. The semipermeable membrane device (SPMD), a passive sampler, has been developed since 1990 and is widely used as a monitoring tool for assessing organic contaminants in aquatic environments. SPMD has shown excellent performance in estimating the bioavailable concentrations of persistent hydrophobic chemicals in water. Dissolved polycyclic aromatic hydrocarbon (PAH) concentrations in estuarine water of Kaohsiung Harbor were measured using XAD-2 resin and semipermeable membrane devices (SPMDs) calibrated with performance reference compounds (PRCs). Cubic polynomial regressions using sampling rate for five PRC (Rs-PRC) gave estimates in-situ sampling rates (Rs). The turbulent conditions in surface water were important in enhancing Rs, but diffusion was relevant to bottom water that was less turbulent and showed decreasing Rs with log (Kow) with at high MW PAHs. The dependence of the Rs of semipermeable membrane devices (SPMDs) with the flow rate and temperature was then investigated. The in situ Rs values were not found to vary with the flow rate and temperature. The empirical equation of the Rs value under the SPMDs equipment was established. This infers that PRCs could be avoided by using an established empirical equation under similar field conditions.
简介：Dr. Lee is a professor in the Department of Marine Environment & Engineering Science, National Sun Yat-sen University, Taiwan. His research interests are Coastal Environmental Chemistry, Contaminant Fate and Transport, Water Quality, Colloid and Surface Chemistry, Wastewater Treatment.