Beijing Normal University, Beijing 100875, China.
J Environ Sci (China). 2013 Feb 1;25(2):316-25. doi: 10.1016/s1001-0742(12)60033-3.
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.
利用 ArcGis 地统计分析模块，评估了代表太湖五个区域的 36 个表层沉积物样本中总汞（THg）的空间分布模式。还从这五个湖区评估了 THg 的污染水平。表层沉积物中 THg 的浓度范围为 23-168ng/g（平均值为 55ng/g），明显高于该湖的基线水平。THg 的结果表明，北部区域表现出明显更高的数值，湾区域相对于开阔区域显示出升高的数值，而湖滨区域高于中心区域观察到的数值。太湖受到中度到高度的汞污染，根据单项污染指数 I(geo)和人为活动因素表现出明显的汞富集状态。太湖表层沉积物中 THg 的浓度表现出中等-强变异性（变异系数为 52%）。地统计学分析表明空间自相关性较弱，表明太湖 Hg 的污染主要是人为活动的结果。
