长江口咸淡水混合过程中溶解态硼的含量及同位素组成特征  

Isotopic Composition and Concentration of Dissolved Boron in a Freshwater-Seawater Mixing Plume of the Yangtze River Estuary

作　　者：肖应凯[1] 廖步勇[1] 王中良[2] 张崇耿[1] 魏海珍[1] 

机构地区：[1]中国科学院青海盐湖研究所 [2]中国科学院地球化学研究所,贵州贵阳550002

出　　处：《矿物岩石地球化学通报》2003年第4期324-327,共4页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(40171935)

摘　　要：采用Cs2BO+2 石墨技术对长江口咸淡水混合过程中溶解态的硼同位素组成进行了测定,得到混合水的δ11B的变化范围是39.9‰～12.6‰,硼浓度的变化范围是2.07～0.0429μg/mL。结果表明,混合水的硼浓度和δ11B均随离长江口岸距离的增加而增加,但硼浓度与其它所有水化学成分一样,只呈线性关系而增加。而δ11B值是呈对数关系而增加,即在混合的初期,混合水的δ11B值随海水的掺入而急剧增加至海水的δ11B值后趋于稳定。混合水δ11B值的这种变化是长江淡水与海水简单混合的结果。Isotopic compositions of dissolved boron in a freshwater-seawater mixing plume in the Yangtze River Estuary, China were measured by using the Cs_2BO^+_2-graphite technique. The range of δ^(11)B values varies from 39.9‰ to 12.6‰ while that of boron concentrations from 2.07 μg / mL to 0.0429 μg/mL. Results show that, with distance away from the Yangtze River Estuary, the δ^(11)B values and boron concentrations increase. However,concentrations of boron and other chemical components increase with a linear relationship while the δ^(11)B values with a logarithmic trend. At the initial mixing stage, following the infiltration of seawater, the δ^(11)B values of mixed water increased sharply, then remained stable until it rose to the level of seawater. The change of δ^(11)B values for mixed water indicates a simple mixing procedure of freshwater and seawater.

关 键 词：硼 同位素组成 咸淡水混合 长江口 

分 类 号：P734[天文地球—海洋化学]