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
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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～-300 mV之间，大部分在-250 mV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。Abstract: 00)
〖WT5HZ〗Abstract〓〖WTBZ〗The values of pH and Eh (OxidationReduction 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 300mv 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. -
Key words:
- Yangtze River estuary /
- East China Sea /
- surface sediment /
- pH /
- Eh /
- influence factor
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