基于原位磁性测量的海滩沉积物重金属污染来源和迁移范围解析  

Analysis of the Source and Migration of Heavy Metal Pollution in Beach Sediments Based on In-situ Magnetic Measurements

作　　者：王永红[1] 王凯伟 冯哲 梁伟强 黄伊恒 Wang Yonghong;Wang Kaiwei;Feng Zhe;Liang Weiqaing;Huang Yiheng(Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;CCCC Water Transportation Consultants Company Linited,Beijing 100007,China)

机构地区：[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,山东青岛266100 [2]中交水运规划设计研究院有限公司,北京100007

出　　处：《中国海洋大学学报（自然科学版）》2024年第9期122-132,共11页Periodical of Ocean University of China

基　　金：山东省自然科学基金项目(ZR2022MD109);国家自然科学基金面上项目(42376163);基础科学技术资源专项调查项目(2022FY202402);国家重点研究发展计划项目(2016YFC0402602)资助。

摘　　要：环境磁学被广泛认为是监测沉积物中重金属污染的一种有效方法。本研究将以青岛两个海滩为例,研究通过原位磁性测量获得的体积磁化率值(κ)辅以重金属含量数值,以获得重金属污染的κ临界值并追踪沉积物重金属污染的来源和迁移。结果表明,第一海水浴场海滩沉积物没有重金属污染,第二海水浴场海滩沉积物存在轻微的Cr、Zn和Fe污染,其主要来自于排污口废水排放。青岛花岗岩质海岸的κ值的背景值在600×10^(-5) SI以内。当κ超过600×10^(-5) SI左右时,海滩存在出现重金属污染的可能;当κ超过1600×10^(-5) SI左右时,会轻微出现污染。在同一海滩较高的κ值是较低值的50倍以上时,海滩将存在明显的重金属污染。重金属在海滩上的迁移模式受到污染源、风和水动力因素的影响也受到城市排污政策控制。本研究明确了如何利用快速、高分辨率以及常态化的现场原位磁性测量,以有效追踪海滩上重金属的来源以及了解污染物的扩散范围,该方法可以辅助海滩生态系统保护以及海滩污染管理政策的制定。The utilization of environmental magnetism has gained widespread recognition as a potent technique for assessing heavy metal contamination in sediment.This study aims to investigate volumetric magnetization rate values(κ)derived from in situ magnetic measurements and heavy metal content values to identifyκcritical values for heavy metal contamination,and to trace the source and spread of heavy metal contamination in the sediments of two beaches in Qingdao.The results revealed that the No.1 beach was free of heavy metal contamination,while the sediments of the No.2 beach indicated slight Zn and Fe contamination,primarily originating from outfall wastewater discharge.Theκbackground value of the granitic coast in Qingdao is approximately 600×10^(-5) SI.Whenκsurpasses 600×10^(-5) SI,the possibility of heavy metal contamination in the beach is probable,whileκabove 1600×10^(-5) SI indicates slight pollution in the beach.When the higherκvalue of the same beach weight is over 50 times greater than the lower value,the beach experiences significant heavy metal pollution.The spread of heavy metals on beaches is impacted by pollution sources,wind and hydrodynamic factors,but is mainly influenced by urban discharge policies.This research illustrates how in situ magnetic measurements can be used to track heavy metal sources on beaches accurately,comprehend the extent of contaminant dispersion,and facilitate effective beach ecosystem protection and beach pollution management policy development.

关 键 词：海滩沉积物 原位沉积物磁性测量 重金属污染 污染来源和迁移范围 

分 类 号：P736.4[天文地球—海洋地质]