Journal
ENVIRONMENTAL POLLUTION
Volume 157, Issue 6, Pages 1953-1956Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2009.01.031
Keywords
Mercury; Dissolved organic carbon; DOC; Ultraviolet absorbance
Categories
Funding
- Northeast States Research Consortium
- Syracuse University Center of Excellence
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Stream water samples were collected over a range of hydrologic and seasonal conditions at three forested watersheds in the northeastern USA. Samples were analyzed for dissolved total mercury (THgd), DOC concentration and DOC composition, and UV254 absorbance across the three sites over different seasons and flow conditions. Pooling data from all sites, we found a strong positive correlation of THgd to DOC (r(2) = 0.87), but progressively stronger correlations of THgd with the hydrophobic acid fraction (HPOA) of DOC (r(2) = 0.91) and with UV254 absorbance (r(2) = 0.92). The strength of the UV254 absorbance-THgd relationship suggests that optical properties associated with dissolved organic matter may be excellent proxies for THgd concentration in these streams. Ease of sample collection and analysis, the potential application of in-situ optical sensors, and the possibility for intensive monitoring over the hydrograph make this an effective, inexpensive approach to estimate THgd flux in drainage waters. (C) 2009 Elsevier Ltd. All rights reserved.
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