کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4424714 1619200 2013 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates
چکیده انگلیسی

To assess inter-comparability of fluvial mercury (Hg) observations at substantially different scales, Hg concentrations, yields, and bivariate-relations were evaluated at nested-basin locations in the Edisto River, South Carolina and Hudson River, New York. Differences between scales were observed for filtered methylmercury (FMeHg) in the Edisto (attributed to wetland coverage differences) but not in the Hudson. Total mercury (THg) concentrations and bivariate-relationships did not vary substantially with scale in either basin. Combining results of this and a previously published multi-basin study, fish Hg correlated strongly with sampled water FMeHg concentration (ρ = 0.78; p = 0.003) and annual FMeHg basin yield (ρ = 0.66; p = 0.026). Improved correlation (ρ = 0.88; p < 0.0001) was achieved with time-weighted mean annual FMeHg concentrations estimated from basin-specific LOADEST models and daily streamflow. Results suggest reasonable scalability and inter-comparability for different basin sizes if wetland area or related MeHg-source-area metrics are considered.


► National scale mercury assessments integrate small scale study results.
► Basin scale differences and representativeness of fluvial mercury samples are concerns.
► Wetland area, not basin size, predicts inter-basin methylmercury variability.
► Time-weighted methylmercury estimates improve the prediction of mercury in basin fish.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Pollution - Volume 172, January 2013, Pages 42–52
نویسندگان
, , , , , ,