海螺沟冰川融水径流中汞与悬浮颗粒物的季节变化特征及其关系研究  

Seasonal Variation and Relationship between Mercury and Suspended Particulate Matter in Hailuogou Glacier Meltwater Runoff

作　　者：王洁 孙学军 李明月 李胜楠 郭军明 张强弓[1] WANG Jie;SUN Xuejun;LI Mingyue;LI Shengnan;GUO Junming;ZHANG Qianggong(State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;State Key Laboratory of Cryospheric Sciences,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院青藏高原研究所青藏高原地球系统与资源环境国家重点实验室,北京100101 [2]中国科学院大学杭州高等研究院,杭州310024 [3]中国科学院西北生态环境资源研究院冰冻圈科学国家重点实验室,兰州730000 [4]中国科学院大学,北京100049

出　　处：《地球与环境》2022年第3期320-327,共8页Earth and Environment

基　　金：第二次青藏高原综合科学考察研究专项(2019QZKK0605);国家自然科学基金项目(42022003、41671074)。

摘　　要：为研究冰川融水径流中汞与悬浮颗粒物的变化及其相关关系,于2019年6月~2020年9月在青藏高原东南缘海螺沟冰川融水径流进行为期一年的连续定点采样,测试了样品中汞形态含量和悬浮颗粒物的数量、含量及粒径特征。分析表明,总汞的平均含量为6.96~10.78 ng/L,其中颗粒态汞为4.54~9.14 ng/L,溶解态汞为1.53~2.42 ng/L,与青藏高原及世界其他偏远地区河流汞含量相当。各形态汞与悬浮颗粒物不同特征在不同季节的相关关系差异显著,总汞和颗粒态汞含量与总悬浮颗粒物含量和数量在夏季消融盛期具有突出且一致的正相关关系,但在秋冬季并未显示出正相关,表明前人揭示的冰川补给河流中颗粒物控制汞含量变化的结论具有季节局限性。冰川径流中的汞受水文过程和汞的来源及其在水体中的转化等多因素影响,汞形态含量与悬浮颗粒物不同物理特征在不同季节的差异性可能反映了不同季节汞的来源和传输机制的差异。To investigate the relationship between mercury and suspended particle in glacial meltwater runoff,a consecutive series water samples were collected at a fixed-point from Hailuogou glacier meltwater runoff in the southeastern margin of the Tibetan Plateau from June 2019 to September 2020.Mercury speciation and the quantity,content and size of suspended particles(SP)were measured.The results showed that the average concentration of total mercury,particulate mercury and dissolved mercury ranged 6.96-10.78 ng/L,4.54-9.14 ng/L and 1.53-2.42 ng/L,respectively,which is comparable to that of rivers in the Tibetan Plateau and other remote areas in the world.Correlations between mercury and the characteristics of SP in different seasons are significantly different.The content of total mercury and particulate mercury was positively correlated with the content and quantity of SP during the summer.However,there was no positive correlation in autumn and winter,indicating that previous conclusion of mercury dominated by SP in glacier-fed rivers is likely exclusively applicable at summer ablation season.We suggested that mercury in glacial runoff is conjointly affected by hydrological processes,mercury’s sources and its transformation in river water.The differences of correlations between mercury speciation and physical characteristics of SP in different seasons may suggest distinct sources and transport mechanisms of mercury in different seasons.

关 键 词：融水径流 汞 悬浮颗粒物 相关关系 

分 类 号：X142[环境科学与工程—环境科学]