title: Seasonal variation in dissolved gaseous mercury and total mercury concentrations in Juam Reservoir, Korea.
abstract: Dissolved gaseous mercury (DGM) and total mercury (TM) concentrations were measured in Juam Reservoir, Korea. DGM concentrations were higher in spring (64+/-13pgL(-1)) and summer (109+/-15pgL(-1)), and lower in fall (20+/-2pgL(-1)) and winter (23+/-6pgL(-1)). In contrast, TM concentrations were higher in fall (3.2+/-0.1ngL(-1)) and winter (3.3+/-0.1ngL(-1)) than in spring (2.3+/-0.1ngL(-1)) and summer (2.2+/-0.4ngL(-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+/-15pgL(-1)) and TM (2.2+/-0.4ngL(-1)) concentrations in Juam Reservoir were higher than the averages for North American lakes (DGM=38+/-16pgL(-1); TM=1.0+/-1.2ngL(-1)), but lower than levels reported for Baihua Reservoir in China.
authors.affiliation: Institute of Health & Environment, School of Public Health, Seoul National University, 28 YeonGeon-Dong, Jongro-Gu, Seoul 110-799, South Korea.
authors.forename: Jong-Sung
authors.initials: JS
authors.lastname: Park
authors.forename: Sehee
authors.initials: S
authors.lastname: Oh
authors.forename: Mi-Yeon
authors.initials: MY
authors.lastname: Shin
authors.forename: Moon-Kyung
authors.initials: MK
authors.lastname: Kim
authors.forename: Seung-Muk
authors.initials: SM
authors.lastname: Yi
authors.forename: Kyung-Duk
authors.initials: KD
authors.lastname: Zoh
mesh_terms: D002244:Carbon / Q000032:analysis; D002681:China; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods; D005618:Fresh Water; D005740:Gases; D007723:Korea; D008628:Mercury / Q000032:analysis*; D012621:Seasons; D012995:Solubility; D013696:Temperature; D014466:Ultraviolet Rays; D014481:United States; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005740:Gases; D014874:Water Pollutants, Chemical; D002244:Carbon; D008628:Mercury