Distribution of polycyclic aromatic hydrocarbons in southern chesapeake bay surface water: evaluation of three methods for determining freely dissolved water concentrations

摘要

Gas sparging, semipermeable-membrane devices (SPMDs), and filtration with sorption of dissolved polycyclic aromatic hydrocarbons (PAHs) to XAD-2 resin were evaluated for determining the concentrations of freely dissolved PAHs in estuarine waters of southern Chesapeake Bay at sites ranging from rural to urban and highly industrialized. Gas sparging had significant sampling artifacts due to particle scavenging by rising bubbles, and SPMD s were kinetically limited for four-ring and larger PAHs relative to short-term temporal changes in water concentrations.