作　　者： ; ; ; ; ; ;

机构地区： 华东师范大学河口海岸科学研究院河口海岸学国家重点实验室

出　　处： 《海洋环境科学》 2007年第4期317-320,共4页

摘　　要： 通过分析长江口南槽上段白龙港排污口邻近水域14 h不间断定点剖面上采集的水体中颗粒态和溶解态重金属元素Zn,Cu,As,Cd,V,Cr,Ni和Pb浓度,研究潮周期内表层沉积物的再悬浮对重金属在颗粒态和溶解态中分配和迁移的影响。结果表明:潮周期内中层单位质量悬沙的重金属浓度(Mp)始终大于底层;随着含沙量(TSS)增大,单位悬沙的各重金属浓度(Mp)减小,水体中各重金属颗粒态浓度(Ms)增大,溶解态浓度(Md)减小;当含沙量大于一定值时,单位悬沙的各重金属浓度趋向稳定值;含沙量分别在涨憩和落急时达到峰值,所以涨憩沙峰时刻有利于重金属的吸附,但落急沙峰时刻因流速较大,不利于重金属的吸附。因此,转流时水质较涨、落急好。 The impact of re-suspension in bed-sediment on transportation of the heavy metals was studied by the concentration determination of the heavy metals Zn, Cu, As, Cd, V, Cr, Ni and Pb in particulate phase and dissolved phase. The samples were collected from the South Passage, Changjiang Estuary during a single tidal cycle. The results show that the absorption amount （ × 10^-6） on particles at mid-layer is higher than at the bottom-layer during the tidal cycle. The total amount of the heavy metal （rig/L） in particulate was increased with the increase of the sediment concentration （ kg/m^3 ）, while absorption amount of each heavy metal and concentration of the heavy metals in dissolved phase were decreased. However, the absorption amount of each heavy metal was to be constant while the sediment concentration was increased to be a certain value. Two peaks of the sediment concentration occurred within the tide. The release of the heavy metals is from particulate phase to dissolved phase during the maximum ebb and flood tide, but they could tend to be absorbed in a particulate phase during the flood slack water. The quality water was better during the ebb and flood slack water than those the maximum ebb and flood tide.

关 键 词： 重金属 再悬浮 吸附 释放

领　　域： [天文地球] [天文地球]