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...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.展开更多
This paper provides a general review of the research status of mercury emissions in China.Global surveys rank Asia as the region with the largest share of global mercury emissions,accounting for almost half.China cont...This paper provides a general review of the research status of mercury emissions in China.Global surveys rank Asia as the region with the largest share of global mercury emissions,accounting for almost half.China contributes about one-third of the world’s mercury emissions,which is 600-800 t per year.And thus,it plays a vital role in reducing global mercury emissions.Data since 2003 has been surveyed.Mercury emissions in China have risen in the beginning and then declined.There are differences in the composition of mercury emissions sources between China and the world,in which coal combustion and non-ferrous metals smelting contribute more than 50%of the emissions in China.Although mercury emission standards in China are close to those of the European Union and the United States,annual mercury emissions in China are four times higher than those of the United States.Mercury emissions in China are concentrated in the central and eastern regions now,but the annual mercury emissions are increasing in the western regions,which may be related to the construction of industrial parks.展开更多
基金supported by the National Natural Science Foundation of China (No.21077097)
文摘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.
文摘This paper provides a general review of the research status of mercury emissions in China.Global surveys rank Asia as the region with the largest share of global mercury emissions,accounting for almost half.China contributes about one-third of the world’s mercury emissions,which is 600-800 t per year.And thus,it plays a vital role in reducing global mercury emissions.Data since 2003 has been surveyed.Mercury emissions in China have risen in the beginning and then declined.There are differences in the composition of mercury emissions sources between China and the world,in which coal combustion and non-ferrous metals smelting contribute more than 50%of the emissions in China.Although mercury emission standards in China are close to those of the European Union and the United States,annual mercury emissions in China are four times higher than those of the United States.Mercury emissions in China are concentrated in the central and eastern regions now,but the annual mercury emissions are increasing in the western regions,which may be related to the construction of industrial parks.
