【作者】 肖应凯； 廖步勇； 王中良； 张崇耿； 魏海珍；

【Author】 XIAO Ying-kai ,LIAO Bu-yong ,WANG Zhong-liang, ZHANG Chong-geng ,WEI Hai-zhenQinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;Key Laboratory of Loess and Quaternary Geology , Chinese Academy of Sciences , Xi’an 710054, China;Institute of Geochemistry , Chinese Academy of Sciences , Guiyang 550002, China

【机构】 中国科学院青海盐湖研究所； 中国科学院地球化学研究所；

【摘要】 采用Cs₂BO₂⁺-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。更多还原

【Abstract】 Isotopic compositions of dissolved boron in a freshwater-seawater mixing plume in the Yangtze River Estuary, China were measured by using the Cs2BO2+ -graphite technique. The range of δ11B values varies from 39. 9‰ to 12. 6‰ while that of boron concentrations from 2. 07 μg / mL to 0. 0429μg/mL. Results show that, with distance away from the Yangtze River Estuary, the δ11B values and boron concentrations increase. However,concentrations of boron and other chemical components increase with a linear relationship while the δ11B values with a logarithmic trend. At the initial mixing stage, following the infiltration of seawater, the δ11B values of mixed water increased sharply, then remained stable until it rose to the level of seawater. The change of δ11B values for mixed water indicates a simple mixing procedure of freshwater and seawater.更多还原