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 |
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引用本文: | 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.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[J].农业环境与发展,2016(6):1144-1152. |
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作者姓名: | 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 |
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作者单位: | 1. 南京大学环境学院,污染控制与资源化国家重点实验室,南京 210023;2. 南京大学环境学院,污染控制与资源化国家重点实验室,南京 210023; 南京农业大学资源与环境科学学院,南京 210095 |
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基金项目: | 国家自然科学基金项目(21477053) |
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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。
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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 |
Pollution characteristics of metals and nutrients in different regions of Lake Taihu based on diffusive gradients in thin-films technique |
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Abstract: | 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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Keywords: | Lake Taihu DGT precipitated zirconia gel P speciation regional pollution |
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