کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4424528 1619196 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Extreme precipitation appears a key driver of mercury transport from the watershed to Cottage Grove Reservoir, Oregon
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Extreme precipitation appears a key driver of mercury transport from the watershed to Cottage Grove Reservoir, Oregon
چکیده انگلیسی

An abandoned cinnabar mining and roasting site is in the major sub-basin of the watershed for Cottage Grove Reservoir, Oregon. Average surface sediment total mercury concentration in the river draining this sub-basin (0.61 ± 0.52 μg/g) was about ten-fold higher than three smaller tributaries to the reservoir. Total mercury in reservoir surface sediments averaged 1.66 ± 0.70 μg/g. Stratigraphy for two sediment cores indicated generally decreased reservoir mercury loading from 1963 to 2002 but two pronounced peaks in mercury deposition. Years of extreme precipitation immediately prior to these peaks at least partially explained them. Epaxial muscle total mercury concentrations of largemouth bass increased with body weight up to 2.5 μg/g. A gradient of mercury concentrations in soils from a 3.3 km diameter grid indicated condensation of mercury vapors from the mine site polluted the sub-basin.


► Pollution of the watershed with mercury yields a highly persistent human health risk.
► Watershed level events profoundly influence mercury transport into aquatic ecosystems.
► Soil and sediment mercury concentration gradients are a source identification tool.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 176, May 2013, Pages 178–184
نویسندگان
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