HR-ICP-MS研究黄河三个连续区域段表层沉积物中重金属污染的空间分布和季节变化（英文）

发布时间：2018-05-05 10:16

本文选题：空间分布 + 季节变化　；参考：《光谱学与光谱分析》2016年08期

【摘要】：采用高分辨电感耦合等离子体质谱(HR-ICP-MS)和地积累指数法(I_(geo))对黄河甘肃、宁夏和内蒙古自治区连续三段表层沉积物中重金属(Cr,Pb,Cd,Cu,Zn和Ni)的空间分布和季节性波动(丰水期、枯水期和平水期)以及污染状况进行系统研究分析,研究结果表明:内蒙古段三个季节中沉积物重金属含量都高于甘肃和宁夏段,同时,除Cd外,丰水期所有点的沉积物重金属含量都高于枯水期和平水期,而枯水期和平水期的重金属含量相近。I_(geo)结果显示丰、枯水期的Cd,Cu和Cr元素的I_(geo)值在内蒙古段最高,而在甘肃段最低;所有重金属的I_(geo)值在丰水期高于枯水期,除Cd外,都在平水期降低,而I_(geo)~(Cd)在平水期各采样点明显上升;丰水期的甘肃段、枯水期的甘肃和宁夏段以及平水期的所有采样点中的Pb,Zn和Ni的I_(geo)值都小于0,表明这些元素在这些点几乎无污染。就研究区域而言,内蒙古段的重金属含量以及生态风险最高,Cr,Cd和Cu是最具有潜在风险的三个元素;就研究季节而言,丰水期的重金属含量和潜在风险高于枯水期和平水期,可能是跟丰水期沉积物的pH和总有机碳(TOC)含量较高有关。相关性分析(CCA)用来探究重金属与pH/TOC间的关系以及重金属的潜在来源。CCA的结果表明Pb,Cu,Zn和Ni互相相关,并且这四种元素容易受到周围环境pH和TOC的影响,除此之外,Cr,Cd以及TOC三者相关,且这两种元素受到人类活动影响较严重。该研究工作可为研究区域表层沉积物重金属在不同季节的环境行为提供有效的信息,同时,研究重金属、pH和TOC之间的相关性可有效揭示重金属的潜在来源。
[Abstract]:High resolution inductively coupled plasma mass spectrometry (HR-ICP-MS) and geoaccumulation index method were used to study the spatial distribution and seasonal fluctuation (high water periods) of the heavy metals (CrPbPbCCDCCuZn and Ni) in the surface sediments of Gansu, Ningxia and Inner Mongolia autonomous regions. The results showed that the contents of heavy metals in three seasons of Inner Mongolia were higher than those in Gansu and Ningxia, and the contents of heavy metals in sediments were higher than those in Gansu and Ningxia, except CD. The heavy metal contents in sediments at all points in high water season were higher than those in dry water period and in dry water period. The results showed that CD Cu and Cr in dry season were the highest in Inner Mongolia and the lowest in Gansu. The value of I _ T _ T of all heavy metals is higher in high water season than in dry season, except for CD, it decreases in plain water period, while I _ (T _ (+) _ CD _ (CD) increases obviously at all sampling points in normal water period, and in Gansu section in high water period, In Gansu and Ningxia sections in the dry season and in all the sampling sites in the plain water period, the value of Pb, Zn and Ni is less than 0, which indicates that these elements are almost free of pollution at these points. As far as the study area is concerned, the heavy metal content and ecological risk in Inner Mongolia are the three elements with the most potential risk, and the heavy metal content and potential risk in the high water season are higher than those in the dry season and in the dry season. It may be related to the high pH and total organic carbon (TOC) content of sediments in high water period. The correlation analysis showed that the relationship between heavy metals and pH/TOC and the potential source of heavy metals. The results showed that PbCU Zn and Ni were correlated with each other, and the four elements were vulnerable to the influence of environmental pH and TOC. In addition, there is a correlation between Cr, CD and TOC, and these two elements are seriously affected by human activities. This work can provide effective information for studying the environmental behavior of heavy metals in surface sediments in different seasons, and the correlation between heavy metal pH and TOC can effectively reveal the potential sources of heavy metals.
【作者单位】：中央民族大学生命与环境科学学院;中央民族大学北京市食品环境与健康工程技术研究中心;
【基金】：The National Natural Science Foundation of China(21177163) 111 Project B08044 First-class University First-class Academic Program of Minzu University of China(YLDX01013) Coordinate Development of First-Class and First-Class University Discipline Construction Funds(10301-0150200604) The Academic Team Construction Project of Minzu University of China(2015MDTD25C&13C) First-class Universities and First-class Discipline Construction Transitional Funds Under Special Funding(10301-01404031,2015) Graduate Student Scientific Research Innovation Project of Minzu University of China(K2014042) GCCX2015
【分类号】：X522

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