沉积学报2012，Vol.30Issue(2)：333-339,7.
辽东湾北部海域表层沉积物氧化还原电位及其主要影响因素
The Eh in Surface Sediments in the Northern of Liaodong Bay and Its Main Influencing Factors
摘要
Abstract
The redox potential（Eh） of the surface sediments in the northern waters of Liaodong Bay was directly measured in the autumn of 2007,and the distribution and its main factors including sediments characteristics,the overlying seawater,and river input was studied deeply.The results indicate that： the Eh of the surface sediments ranges between-24.8 mv and-366.7 mv,which means the environment has changed from weak reductive system controlled by O2/H2O,organic matter,MnO2/Mn2＋ and Fe（OH）3/Fe2＋ in the 1990s to reductive system now mainly controlled by SO2-4/HS-,S/HS-and furthermore,there are significant variations in the spatial distribution of Eh,i.e.the value of Eh in the Liaodong Bay tends to become lower from the northeast to the southwest.Although the organic matter is an essential factor of redox reactions,its impact on the distribution of Eh in this region is not obvious due to the higher sedimentation rate and the strong reductive environment.On the contrary,sulfide and temperature have direct impact on the value of Eh,i.e.the higher sulfide and temperature correspond to the lower Eh.Dissolved oxygen of the overlying water is another important factor,and the impact is more obvious especially in the surveyed area with relatively higher dissolved oxygen,where Eh tends to be lower with the decreasing of dissolved oxygen.In addition,the river input is also an important factor affecting the Eh,and the scope is mainly in the Fan-shaped region where fresh water can reach with the center of the Shuang Taizi river mouth.In the past two decades,the concentration of organic matter and sulfide keeps increasing due to the intensified human activity,such as land-based pollution and marine aquaculture,which results in the decreasing of Eh and significant change of the environment.In addition,the distribution and change of Eh in the surface sediments of this area should be the results of the combined effects of the long-term emissions of organic matter and sulfur,the temperature,dissolved oxygen in the overlying water and the mixing of the river input and the tide.To a certain extent,it reflects the pollution of this area.So it is necessary to take appropriate measures to strengthen environment protection in order to keep the sustainable development of the regional economy.关键词
辽东湾北部海域/沉积物/氧化还原电位/影响因素Key words
northern of Liaodong Bay/sediments/Eh/factors分类
天文与地球科学引用本文复制引用
吴金浩,刘桂英,王年斌,徐雪梅,宋伦..辽东湾北部海域表层沉积物氧化还原电位及其主要影响因素[J].沉积学报,2012,30(2):333-339,7.基金项目
国家海洋局“908”项目辽宁专项（批准号：LN-908-01-01-06）资助 （）
