Factors influencing concentrations of dissolved gaseous mercury (DGM) and total mercury (TM) in an artificial reservoir.
The effects of various factors including turbidity, pH, DOC, temperature, and solar radiation on the concentrations of total mercury (TM) and dissolved gaseous mercury (DGM) were investigated in an artificial reservoir in Korea. Episodic total mercury accumulation events occurred during the rainy season as turbidity increased, indicating that the TM concentration was not controlled by direct atmospheric deposition. The DGM concentration in surface water ranged from 3.6 to 160 pg/L, having a maximum in summer and minimum in winter. While in most previous studies DGM was controlled primarily by a photo-reduction process, DGM concentrations tracked the amount of solar radiation only in winter when the water temperature was fairly low in this study. During the other seasons microbial transformation seemed to play an important role in reducing Hg(II) to Hg(0). DGM increased as dissolved organic carbon (DOC) concentration increased (p-value < 0.01) while it increased with a decrease of pH (p-value < 0.01).
Ahn
Myung-Chan
MC
Department of Environmental Science, 192-1, Hyoja-2-dong, Kangwon National University, Chuncheon, Kangwon-do 200-701, Republic of Korea.
Kim
Bomchul
B
Holsen
Thomas M
TM
Yi
Seung-Muk
SM
Han
Young-Ji
YJ
D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D005618:Fresh Water / Q000737:chemistry*; D005740:Gases / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007723:Korea; D008628:Mercury / Q000032:analysis*; D013472:Sunlight; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000032:analysis*
D005740:Gases; D014874:Water Pollutants, Chemical; D008628:Mercury