Journal
ENVIRONMENTAL POLLUTION
Volume 154, Issue 1, Pages 12-20Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2007.12.002
Keywords
dissolved gaseous mercury; total mercury; UV intensity DOC (dissolved oxygen concentration); algae; pH
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Dissolved gaseous mercury (DGM) and total mercury (TM) concentrations were measured in Juarn Reservoir, Korea. DGM concentrations were higher in spring (64 +/- 13 pg L-1) and summer (109 +/- 15 pg L-1), and lower in fall (20 +/- 2 pg L-1) and winter (23 +/- 6 pg L-1). In contrast, TM concentrations were higher in fall (3.2 +/- 0.1 ng L-1) and winter (3.3 +/- 0.1 ng L-1) than in spring (2.3 +/- 0.1 ng L-1) and summer (2.2 +/- 0.4 ng L-1). DGM concentrations were correlated with water temperature (p < 0.0001), ORP (p < 0.0001), UV intensity (UV-A: p = 0.008; UV-B: p = 0.003), and DOC concentration (p = 0.0107). DGM concentrations varied diurnally with UV intensity. The average summer DGM (109 +/- 15 pg L-1) and TM (2.2 +/- 0.4 ng L-1) concentrations in Juam Reservoir were higher than the averages for North American lakes (DGM = 38 +/- 16 pg L-1; TM = 1.0 +/- 1.2 ng L-1), but lower than levels reported for Baihua Reservoir in China. (C) 2007 Elsevier Ltd. All rights reserved.
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