赣江南昌段沉积物重金属和放射性元素污染磁性诊断研究  

Responses of magnetic properties to heavy metal and radioactive elements pollution recorded by river sediments from Nanchang Section of Ganjiang River

作　　者：王思梦 李文 谢如梅 叶长盛[1] 周玉琴 高迎秋 肖婵华 WANG Simeng;LI Wen;XIE Rumei;YE Changsheng;ZHOU Yuqin;GAO Yingqiu;XIAO Chanhua(School of Earth Sciences,East China University of Technology,Nanchang Jiangxi 330013)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013

出　　处：《环境污染与防治》2025年第4期87-94,I0005,共9页Environmental Pollution & Control

基　　金：国家自然科学基金资助项目(No.42167063);江西省大学生创新创业训练计划项目(No.S202310405038)。

摘　　要：河流沉积环境的动态变化导致污染物监测非常复杂,寻找对污染物和沉积环境变化均敏感的指标来监测河流污染的动态变化具有重要意义。对赣江南昌段河漫滩剖面(记为YLZ剖面)沉积物进行了环境磁学、粒度、重金属和放射性元素含量分析,探讨磁学参数在河流沉积物中对重金属和放射性元素污染的响应特征。结果表明,YLZ剖面沉积物中磁性特征由亚铁磁性矿物(如磁铁矿)主导,自剖面底部向上至表层,磁性矿物含量明显增加,不完整反铁磁性矿物(如赤铁矿)比例上升,重金属和放射性元素的富集程度也呈现增加趋势。Cr、Cu、Ni、Sb污染程度相对较低,Tl、As、U污染程度较突出。磁性矿物含量相关参数与重金属和放射性元素的含量、污染因子以及污染负荷指数具有相似的垂向趋势且呈现显著正相关性(P<0.05)。磁性颗粒与重金属和放射性元素在来源、沉积和迁移等方面关系密切,磁性参数可以作为赣江沉积物重金属和放射性元素污染的诊断指标。The monitoring of river pollution is very complicated due to the dynamic changes of river sedimentary environment.It is of great significance to find the index sensitive to both the changes of pollutant and sedimentary environment.The environmental magnetism,grain size,heavy metal and radioactive elements in the sediments of the floodplain section of the Nanchang Section of Ganjiang River(YLZ profile)were analyzed,and the response characteristics of magnetic parameters to heavy metal and radioactive element pollution in river sediments were discussed.The results revealed that the sedimentary magnetic properties were dominated by ferrimagnetic minerals(e.g.magnetite).From the bottom to the top of the profile,the concentration of magnetic minerals showed a markedly increasing trend,and the proportion of imperfect antiferromagnetic minerals(e.g.hematite)increased consistently.The content and pollution levels of heavy metal and radioactive elements showed a significant increasing trend from the bottom to the top of the profile.The data analysis indicated that the pollution levels of Cr,Cu,Ni and Sb were relatively lower.In contrast,Tl,As and U were the dominant pollutants in the YLZ profile.The concentration-related magnetic parameters had similar vertical characteristics and significant positive correlations with heavy metal and radioactive elements concentration,as well as the pollution load index and pollution factor(P<0.05).There were essential linkages of sources,deposition,and migration between magnetic minerals and heavy metal and radioactive elements.The magnetic parameters could be used as indicators for heavy metal and radioactive element pollution in Ganjiang River.

关 键 词：磁性特征 重金属元素 放射性元素 粒度 赣江 

分 类 号：X522[环境科学与工程—环境工程]