title: Spatial distribution and pollution assessment of mercury in sediments of Lake Taihu, China.
abstract: Spatial distribution patterns of total mercury (THg) in 36 surficial sediment samples representing five regions of Lake Taihu were assessed using the ArcGis geostatistical analyst module. The pollution levels of THg were also evaluated from the same five lake regions. Concentrations of THg were in a ranged of 23-168 ng/g (mean 55 ng/g) in surfical sediments, which was significantly higher than those established baseline levels of the lake. Results of THg indicated that the northern region exhibited notably higher values, the bay regions showed elevated values relative to open areas, and the lakeside regions were higher than those observed in the central area. Lake Taihu suffered moderate to high Hg pollution, and expressed clear Hg enrichment status according to monomial pollution index I(geo) and human activity factors. The concentrations of THg in the surficial sediments of Lake Taihu showed moderate-strong variation (coefficient of variation 52%). Geostatistical analysis indicated a weak spatial self-correlation, suggesting the contamination of Hg in Lake Taihu is primarily the result of anthropogenic activities.
authors.affiliation: Beijing Normal University, Beijing 100875, China. fayechen226@163.com
authors.forename: Chunxiao
authors.initials: C
authors.lastname: Chen
authors.forename: Binghui
authors.initials: B
authors.lastname: Zheng
authors.forename: Xia
authors.initials: X
authors.lastname: Jiang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhao
authors.forename: Yuzhu
authors.initials: Y
authors.lastname: Zhan
authors.forename: Fengjiao
authors.initials: F
authors.lastname: Yi
authors.forename: Jiaying
authors.initials: J
authors.lastname: Ren
mesh_terms: D002681:China; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis*; D060106:Lakes; D008628:Mercury / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D014874:Water Pollutants, Chemical; D008628:Mercury