發(fā)布時(shí)間：2018-05-05 10:16

  本文選題：空間分布 + 季節(jié)變化��； 參考：《光譜學(xué)與光譜分析》2016年08期

【摘要】：采用高分辨電感耦合等離子體質(zhì)譜(HR-ICP-MS)和地積累指數(shù)法(I_(geo))對(duì)黃河甘肅、寧夏和內(nèi)蒙古自治區(qū)連續(xù)三段表層沉積物中重金屬(Cr,Pb,Cd,Cu,Zn和Ni)的空間分布和季節(jié)性波動(dòng)(豐水期、枯水期和平水期)以及污染狀況進(jìn)行系統(tǒng)研究分析,研究結(jié)果表明:內(nèi)蒙古段三個(gè)季節(jié)中沉積物重金屬含量都高于甘肅和寧夏段,同時(shí),除Cd外,豐水期所有點(diǎn)的沉積物重金屬含量都高于枯水期和平水期,而枯水期和平水期的重金屬含量相近。I_(geo)結(jié)果顯示豐、枯水期的Cd,Cu和Cr元素的I_(geo)值在內(nèi)蒙古段最高,而在甘肅段最低;所有重金屬的I_(geo)值在豐水期高于枯水期,除Cd外,都在平水期降低,而I_(geo)~(Cd)在平水期各采樣點(diǎn)明顯上升;豐水期的甘肅段、枯水期的甘肅和寧夏段以及平水期的所有采樣點(diǎn)中的Pb,Zn和Ni的I_(geo)值都小于0,表明這些元素在這些點(diǎn)幾乎無(wú)污染。就研究區(qū)域而言,內(nèi)蒙古段的重金屬含量以及生態(tài)風(fēng)險(xiǎn)最高,Cr,Cd和Cu是最具有潛在風(fēng)險(xiǎn)的三個(gè)元素;就研究季節(jié)而言,豐水期的重金屬含量和潛在風(fēng)險(xiǎn)高于枯水期和平水期,可能是跟豐水期沉積物的pH和總有機(jī)碳(TOC)含量較高有關(guān)。相關(guān)性分析(CCA)用來(lái)探究重金屬與pH/TOC間的關(guān)系以及重金屬的潛在來(lái)源。CCA的結(jié)果表明Pb,Cu,Zn和Ni互相相關(guān),并且這四種元素容易受到周?chē)h(huán)境pH和TOC的影響,除此之外,Cr,Cd以及TOC三者相關(guān),且這兩種元素受到人類(lèi)活動(dòng)影響較嚴(yán)重。該研究工作可為研究區(qū)域表層沉積物重金屬在不同季節(jié)的環(huán)境行為提供有效的信息,同時(shí),研究重金屬、pH和TOC之間的相關(guān)性可有效揭示重金屬的潛在來(lái)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.
【作者單位】： 中央民族大學(xué)生命與環(huán)境科學(xué)學(xué)院;中央民族大學(xué)北京市食品環(huán)境與健康工程技術(shù)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
【分類(lèi)號(hào)】：X522

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