Monitoring priority pollutants in the Yanghe river by dichloromethane extraction and semipermeable membrane device (SPMD)

Traditional dichloromethane extraction and semipermeable membrane devices containing triolein (triolein-SPMD) were used to monitor the presence and concentrations of priority organic pollutants in the Yanghe River. Qualitatively, both approaches give similar information on the types of priority pollutants in this river. After concentrated by SPMD for 28 days, analysis of priority pollutants is more feasible, time-integrative- , and the data reflect the bioavailability. Assuming their concentrations in water were relatively stable during sampling period, it is possible to estimate concentrations for most of chemicals with log Ktw larger than 3 by the measured concentrations in triolein. But it is difficult to estimate concentrations for chemicals with log Ktw less than 3. Also, we reported for the first time the field mean Rss and their variances for individual PCB congener and the concentration distribution of priority pollutants in the river.