Impact of Piers on Tidal Marshes： Accumulation of Wood Preservative Metals in Water and Soils

作     者：B. Vasilas J. Bowman A. Rogerson A. Chimside W. Ritter 

作者机构：Department of Plant and Soil Sciences University of Delaware Newark Delaware 19716 USA Department of Entomology and Wildlife Ecology University of Delaware Newark Delaware 19716 USA Delaware Department of Natural Resources and Environmental Control Dover Delaware 19904 USA Department of Bioresources Engineering University of Delaware Newark Delaware 19716 USA 

出 版 物：《Journal of Environmental Science and Engineering》 (环境科学与工程（英文版）)

年 卷 期：2011年第5卷第3期

页      面：260-270页

学科分类：082902[工学-木材科学与技术] 08[工学] 0829[工学-林业工程] 0815[工学-水利工程] 

主　　题：Tidal marshes piers arsenic chromium copper. 

摘      要：Wood treated with chromated copper arsenate （CCA） is a common material for pier pilings. Research on CCA impacts in estuarine systems indicates that the magnitude of the biological effect is variable and dependent on sediment and water characteristics. To assist environmental agencies in assessing pier impacts a project was conducted in the U.S.A. to investigate the spatial distribution and magnitude of As, Cr, and Cu accumulation in waters and soils near old and new piers. For new piers, soluble metal levels were highest within 2.9 m of the piers. Total As and Cu levels approached background levels at distances of 2.9 m and 1.4 m, respectively. For old piers, total As and Cu approached background levels at a distance of 9.0 m. Total Cr never exceeded background levels. Threshold effects concentrations were exceeded by sedimented As and Cu within 3.6 m of old piers and 2.1 m of new piers. Apparent effects thresholds were never reached. The only water chemistry variable impacted by piers was As with new piers. It was concluded that leachates accumulate only close to piers and at levels below critical biological thresholds, and would be expected to have negligible ecological effects in reasonably flushed areas.