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- W2314758840 abstract "Abstract Streams and rivers are important pathways for the export of atmospherically deposited mercury (Hg) from watersheds. Dissolved Hg (Hg D ) is strongly associated with dissolved organic carbon (DOC) in stream water, but the ratio of Hg D to DOC is highly variable between watersheds. In this study, the Hg D :DOC ratios from 19 watersheds were evaluated with respect to Hg wet deposition and watershed soil organic carbon (SOC) content. On a subset of sites where data were available, DOC quality measured by specific ultra violet absorbance at 254 nm, was considered as an additional factor that may influence Hg D :DOC . No significant relationship was found between Hg wet deposition and Hg D :DOC, but SOC content (g m −2 ) was able to explain 81% of the variance in the Hg D :DOC ratio (ng mg −1 ) following the form: Hg D :DOC=17.8*SOC −0.41 . The inclusion of DOC quality as a secondary predictor variable explained only an additional 1% of the variance. A mathematical framework to interpret the observed power‐law relationship between Hg D :DOC and SOC suggests Hg supply limitation for adsorption to soils with relatively large carbon pools. With SOC as a primary factor controlling the association of Hg D with DOC, SOC data sets may be utilized to predict stream Hg D :DOC ratios on a more geographically widespread basis. In watersheds where DOC data are available, estimates of Hg D may be readily obtained. Future Hg emissions policies must consider soil‐mediated processes that affect the transport of Hg and DOC from terrestrial watersheds to streams for accurate predictions of water quality impacts." @default.
- W2314758840 created "2016-06-24" @default.
- W2314758840 creator A5008256394 @default.
- W2314758840 creator A5011715677 @default.
- W2314758840 creator A5066461200 @default.
- W2314758840 date "2016-04-01" @default.
- W2314758840 modified "2023-10-03" @default.
- W2314758840 title "Association of dissolved mercury with dissolved organic carbon in U.S. rivers and streams: The role of watershed soil organic carbon" @default.
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- W2314758840 doi "https://doi.org/10.1002/2015wr017849" @default.
- W2314758840 hasPublicationYear "2016" @default.
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