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当前位置: 首页 > 文章 > 基于梯度扩散薄膜技术的太湖金属和营养盐区域污染特征分析 农业资源与环境学报 2016,35 (006) 1144-1152
Position: Home > Articles > Pollution characteristics of metals and nutrients in different regions of Lake Taihu based on diffusive gradients in thin-films technique Journal of Agricultural Resources and Environment 2016,35 (006) 1144-1152

基于梯度扩散薄膜技术的太湖金属和营养盐区域污染特征分析

作  者：
周春羊;管冬兴;韩永和;潘岳;房煦;王兴雨;郑建伦;李亚青;魏天娇;邹宜涛;崔昕毅;罗军
单  位：
南京大学环境学院
关键词：
太湖;梯度扩散薄膜技术(DGT);沉淀状氧化锆吸附膜;磷;有效态含量;区域污染
摘  要：
本研究利用梯度扩散薄膜技术(Diffusive gradients in thin-films,DGT)对太湖7个湖区的水体和沉积物中金属与营养盐有效态含量进行原位监测,并分析污染物的区域特征。结果表明,DGT所测有效态浓度低于传统化学方法所提取浓度,且能实现低浓度、多元素同时监测。具体来看,太湖水体中金属的DGT有效态含量较低,区域差别较小。沉积物中9种典型金属的DGT有效态含量排序为Fe>Mn>Zn>Ni>As>W>Co>Mo>Cu,其中,Fe、As、Zn、Ni和W在竺山湾、梅梁湾和贡湖污染相对较重,在湖心区、胥湖和东太湖污染相对较轻,其余金属分布较平均且含量较低。与金属不同的是,太湖水体中DGT所测的有效磷(P)含量整体较高,最高值出现在贡湖,达83.2μg·L-1。沉积物中DGT有效态P的区域分布更明显,以竺山湾、梅梁湾和沿岸区污染相对较重,最高值出现在竺山湾,达500μg·L-1。对比沉积物和水体中DGT有效态P含量发现,竺山湾、梅梁湾和沿岸区沉积物可能是P的主要储存场所,具有潜在释放风险。
译  名：
Pollution characteristics of metals and nutrients in different regions of Lake Taihu based on diffusive gradients in thin-films technique
关键词：
Lake Taihu%DGT%precipitated zirconia gel%P%speciation%regional pollution
摘  要：
Concentrations of metals and nutrients in water and sediments from 7 different regions in Lake Taihu were measured using in situ diffusive gradients in thin-films(DGT)technique. Their regional pollution characteristics were evaluated. Results showed that the concen-trations of metals and nutrients measured by DGT were lower than those by chemical extraction. Simultaneous measurements of multiple ele-ments at ultra-low concentration levels were obtained using DGT. No obvious differences were found in DGT-measured concentrations of metals in water among 7 regions, while large differences were observed in DGT-measured concentrations of metals in sediments among these regions. Iron, As, Zn, Ni and W were heavily polluted in Zhushan Bay, Meiliang Bay and Lake Gong, compared to the central Lake, Lake Xu and East Lake Taihu. Overall, the order of DGT-measured concentrations of metals in sediments was Fe>Mn>Zn>Ni>As>W>Co>Mo>Cu. Unlike metals, the average P concentrations measured by DGT in water were high, with the highest value(83.2μg·L-1)appeared in Lake Gong. As for DGT-measured P in the sediments, Zhushan Bay, Meiliang Bay and Coastal region were heavily polluted, with the highest val-ue of 500μg·L-1 detected. By comparing P concentrations in sediments with those in water, it was found that the sediments in Zhushan Bay, Meiliang Bay and Coastal region probably acted as P sources, which potentially released P to the overlying water.

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