利用POCIS技术监测城市地表水中全氟化合物

采用一种针对水体中全氟化合物的改进的极性有机化合物整合采样技术(POCIS)进行了不同水流速度下污染物的吸附动力学,以及水流速度对全氟化合物在该采样器上采样速率的影响研究.结果表明,在不同水流速度下7种全氟化合物在放置时间10d内呈线性关系.POCIS对全氟化合物的采样速率随着水流速度(0.085~0.0018m/s)的降低而减小,但是对个别物质如全氟十一酸的采样速率无明显影响.将所建立的POCIS采样方法应用于南京市地表水中,并与常规的主动监测方法进行比较,发现利用POCIS采样技术推算出的污染物时间权重浓度和两次主动采样测定浓度基本一致.

Determination of perfluorinated chemicals in surface water of urban lakes using POCIS

A modified polar organic compounds integrated sampling technique was calibrated to monitor perfluorinated chemicals (PFCs) in water. Uptake kinetics of PFCs and the effect of flow velocities on the sampling rates were investigated. The results showed that, in 10d, the enrichment of PFCs under different flow velocities showed a linear relationship. The sampling rates of PFCs decreased with the flow velocity (0.085~0.0018m/s), but no obvious effect was showed on perfluoroundecate (PFuDA). The established POCIS sampling technique was applied to the surface water in Nanjing City and compared with the conventional active monitoring technique. The calculated concentration by POCIS sampling technique and the measured concentration by the twice active monitoring method were in basic agreement.