杜佳,王永红,郑谦,张勇,黄玲.珠江河口悬浮颗粒的磁学特征及其对重金属污染的指示意义[J].环境科学学报,2020,40(9):3277-3286
珠江河口悬浮颗粒的磁学特征及其对重金属污染的指示意义
- Magnetic characteristics of suspended particles in the Pearl River Estuary and their significance for heavy metal pollution
- 基金项目：国家重点研发计划（No.2016YFC0402602）；国家自然科学基金（No.41376054，41176039，41410304022）
- 杜佳
- 1. 中国海洋大学海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛 266100;2. 湖州市自然资源和规划局, 湖州 100089
- 王永红
- 中国海洋大学海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛 266100
- 郑谦
- 中国海洋大学海洋地球科学学院, 海底科学与探测技术教育部重点实验室, 青岛 266100
- 张勇
- 江苏省电力设计院有限公司, 南京 210000
- 摘要：以珠江河口2017年洪季16个站位和2016年枯季8个站位的悬浮颗粒的磁性测量数据为基础，结合同步的水文调查资料及样品重金属测量数据，探讨了珠江河口悬浮颗粒磁性的时空分布特征及与重金属污染的相互联系.结果表明，珠江口悬浮颗粒的磁化率平均值为61.1×10-8 m3·kg-1，亚铁磁性矿物是珠江口悬浮颗粒磁化率的主要贡献者.整体而言，远口段悬浮颗粒磁性高于河口段，枯季悬浮颗粒磁性高于洪季.珠江口磁性颗粒多畴、单畴和超顺磁同时存在，洪季以准单畴和多畴颗粒为主，枯季以单畴和准单畴颗粒为主.悬浮颗粒磁性的时空分布主要受母岩性质、流量等自然因素及重金属污染的影响.重金属污染和磁学参数的相关性系数多在0.4~0.7之间，且与χ、SIRM、χARM、S-100、S-300、SOFT呈现显著的正相关关系（r≥0.5，p<0.05，n=24），可以用来指示珠江河口悬浮颗粒不同的重金属污染程度.
- Abstract：This study explored the spatial and temporal distribution characteristics of the magnetic properties of suspended particles in the estuary and their relationship with heavy metal pollution based on the results of magnetic measurement at 16 stations in the flood season in 2017 and 8 stations in the dry season of 2016 from the Pearl River Estuary, the synchronous hydrological survey and heavy metal measurement of suspended particles. The results show that the average susceptibility χ value of the suspended particles is 61.1×10-8 m3·kg-1, and ferromagnetic minerals are the main contributors to the magnetic susceptibility. In general,the χ value in the distal estuary section is greater than that of the estuary section, and χ values in the dry season are higher than those in the flood season. The magnetic particles include multi domain, single domain and superparamagnetic properties. Quasi-single domain and multi-domain particles are dominant in the flood season, while single and quasi-single domain particles dominate in dry season. The spatial and temporal distribution of magnetic properties of suspended particles is mainly affected by natural factors such as the nature of parent rock, the discharge of river water, and human activities such as heavy metal pollution. The correlation coefficient between the content of heavy metal elements and magnetic parameters is mostly between 0.4~0.7, and the correlation with χ, SIRM,χARM, S-100, S-300 and SOFT is greater than 0.5, which can be used to indicate different heavy metal pollution degree of suspended particles in the Pearl River Estuary.
