风浪扰动对太湖水体中胶体态痕量金属含量的影响

The influence of wind-wave disturbance on colloidal trace metals in the waters of Taihu Lake.

2005年8月15日~9月2日,观测了不同风浪条件下太湖水体中胶体态(1kD^1μm)Fe、Mn、Cu、Zn、Pb和Cd等痕量金属的含量以及悬浮物(SS)、浮游生物和胶体有机碳(COC)等背景指标的含量变化.结果表明,风浪的扰动作用对太湖水体上述各项指标均有直接或间接的影响,是太湖水环境条件变化的重要驱动力.胶体态痕量金属的含量主要受COC含量、痕量金属总量等因素的影响,但归根结底均受制于风浪的扰动作用.胶体态Mn、Cu和Pb的含量与风浪扰动强度呈正相关;胶体态Zn含量和扰动强度呈负相关;而胶体态Fe含量主要取决于COC和总Fe含量,和风浪扰动强度无明显关系;胶体态Cd含量与COC含量、总Cd含量乃至风浪扰动强度均无明显关系.

From August 15 to September 2, 2005, the contents of colloidal trace metal （lkD-lμm） Fe, Mn, Cu, Zn, Pb and Cd and the content variation of suspended solids （SS）, plankton and colloidal organic carbon （COC） background indexes in Taihu Lake were observed under different wind-wave conditions. The wind-wave disturbance had direct or indirect influences on each index mentioned above of Taihu Lake waters; and was an important driving force for variations of the environmental conditions of Taihu Lake. The contents of colloidal trace metals were mainly influenced by the factors of COC content and total trace metals, but were all affected by the wind-wave disturbance action fundamentally. Contents of colloidal Mn, Cu and Pb appeared positive relation with the intensity of the wave-wind disturbance. While the content of colloidal Zn appeared negative relation with the intensity. However, content of colloidal Fe was decided mainly by the contents of COC and total Fe, without obvious relation with the intensity of wind-wave disturbance. The contents of colloidal Cd had no obvious relation with contents of COC and total Cd and even with the intensity of wind-wave disturbance.