长江口及邻近海域表层沉积物pH、Eh分布及制约因素  

The States of pH,Eh in Surface Sediments of the Yangtze River Estuary and Its Adjacent Areas and Their Controlling Factors

作　　者：齐红艳[1] 范德江[1] 徐琳[1] 杨作升[1] 

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100

出　　处：《沉积学报》2008年第5期820-827,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40676035);重点基金(批准号:90211022);国家重大基础研究发展计划项目(2002CB412404)联合资助

摘　　要：使用精密酸度计和新型全自动氧化还原电位仪测定了长江口及其临近海域表层沉积物中的pH、Eh值,分析了它们的分布特征,并从水团性质、层化特征、底质类型、生物扰动等方面深入探讨了pH、Eh的影响因素和影响机理。研究表明:研究区内表层沉积物属于中性—弱碱性环境,pH值变化于7.1～7.8之间,空间分布上具有分带性和不均一性特征;为还原环境,Eh变化于-100～-300mV之间,大部分在-250mV左右,其空间分布也具有弱分带和不均一的特点。该区沉积物酸碱性主要受水团性质的制约,同时底质类型、生物扰动对沉积物酸碱性也有一定影响,而氧化还原电位则主要受水团性质、水层层化和生物扰动等的影响。The values of pH and Eh （Oxidation-Reduction Potential） of the surface sediments in the Yangtze River estuary and its adjacent areas were determined with a precision acidimeter （pH meter） and a ORP meter. The space distributions of pH and Eh of the sediments in these areas are figured out and their influence factors are systematically discussed. The results indicate that the surface sedimentary environment in the study areas is neutral or weak alkaline with pH value ranging from 7.1 to 7.8. The distribution of pH value in the area is zonal and heterogeneous. The redox in the area is reductive with Eh ranging from -300my to -100mV and mostly ranging around -250mV. Distribution of Eh in the area also seems zonal and heterogeneous. The value of pH in these areas is mainly dominated by the natures of water masses as well as grained size of sediment and patterns of bioturbation. While the natures water masses, water stratification, and patterns of bioturbation are the controlling factors of Eh in these areas.

关 键 词：长江口 东海 沉积物 PH EH 影响因素 

分 类 号：P512.2[天文地球—地质学]