Conaway Christopher H, Ross John R M, Looker Richard, Mason Robert P, Flegal A Russell
Department of Environmental Toxicology, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA.
Environ Res. 2007 Sep;105(1):53-66. doi: 10.1016/j.envres.2006.10.006. Epub 2006 Dec 11.
Monitoring sediment quality and total mercury concentrations over the period 1993-2001 at 26 stations in San Francisco Estuary has shown the seasonal cycling of mercury sediment concentrations, as well as a significant (P < 0.05) decrease in those concentrations at eight stations across the estuary. This decrease in sediment mercury concentrations is attributed to the transport of relatively cleaner sediment to the estuary from the Sacramento River and San Joaquin River watersheds. Despite the decreases observed in some parts of the estuary, no corresponding trend has been found in concurrent studies on sport fish and bivalves in the estuary.
1993年至2001年期间，对旧金山湾26个站点的沉积物质量和总汞浓度进行监测，结果显示了汞沉积物浓度的季节性循环，以及河口八个站点的这些浓度显著（P < 0.05）下降。沉积物汞浓度的下降归因于萨克拉门托河和圣华金河流域相对较清洁的沉积物向河口的输送。尽管在河口的某些区域观察到了下降，但在河口的食用鱼和双壳贝类的同期研究中未发现相应趋势。
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