U.S. Geological Survey, Columbia Environmental Research Center, 4200 New Haven Road, Columbia, MO 65201, USA.
U.S. Geological Survey, Columbia Environmental Research Center, 4200 New Haven Road, Columbia, MO 65201, USA.
Sci Total Environ. 2014 Jun 15;484:322-30. doi: 10.1016/j.scitotenv.2013.07.128. Epub 2013 Aug 23.
The Lower Columbia River in Oregon and Washington, USA, is an important resource for aquatic and terrestrial organisms, agriculture, and commerce. An 86-mile stretch of the river was sampled over a 3year period in order to determine the spatial and temporal trends in the occurrence and concentration of water-borne organic contaminants. Sampling occurred at 10 sites along this stretch and at 1 site on the Willamette River using the semipermeable membrane device (SPMD) and the polar organic chemical integrative sampler (POCIS) passive samplers. Contaminant profiles followed the predicted trends of lower numbers of detections and associated concentrations in the rural areas to higher numbers and concentrations at the more urbanized sites. Industrial chemicals, plasticizers, and PAHs were present at the highest concentrations. Differences in concentrations between sampling periods were related to the amount of rainfall during the sampling period. In general, water concentrations of wastewater-related contaminants decreased and concentrations of legacy contaminants slightly increased with increasing rainfall amounts.
美国俄勒冈州和华盛顿州的下哥伦比亚河是水生和陆地生物、农业和商业的重要资源。为了确定水上有机污染物的发生和浓度的时空趋势，对这条河流的 86 英里河段进行了为期 3 年的采样。在这段河流的 10 个地点和威拉米特河的 1 个地点使用半透过性膜装置（SPMD）和极性有机化学整合采样器（POCIS）被动采样器进行了采样。污染物分布遵循了从农村地区检出数量和相关浓度较低到城市化程度较高的地区检出数量和浓度较高的预期趋势。工业化学品、增塑剂和多环芳烃的浓度最高。采样期间浓度的差异与采样期间的降雨量有关。一般来说，随着降雨量的增加，与废水有关的污染物的水中浓度降低，而遗留污染物的浓度略有增加。
