湘江湘潭段河岸沉积物重金属活性的元素地球化学分析
发布时间：2019-03-07 09:26
【摘要】：本研究利用XRF(X射线荧光)和ICP-MS(电感耦合等离子质谱仪)分析技术测得湘江湘潭段河岸沉积物(XS、ZB)中主、微量元素数据,通过主成分、逐步回归及Pearson相关性分析等方法对湘江湘潭段河岸沉积物进行分析,得到如下结论:(1)河岸沉积物中Si O2、K2O、Ti O2几种元素比较稳定;Na2O、MnO两种元素及LOI组分相对活跃;主量元素具明显贫Na2O、CaO、MgO等碱性组分而富Fe2O3、MnO等氧化物的化学组成特征;Al2O3、MgO、P2O5等组分及LOI在所研究的沉积物中有明显的粒度效应,TiO2、Fe2O3、MnO、K2O等则无明显的粒度效应;主量元素特征显示沉积物的主要物源是上游的花岗岩风化产物。(2)稀土元素特征表明沉积物中:La、Ce、Pr、Nd、Sm等14种稀土元素的平均含量及变异系数Cv值都表现为自XS到ZB显著增大;与上地壳、长江沉积物、长江悬浮物等参照体相比,河岸沉积物的REE配分模式曲线为典型的花岗岩配分模式;XS、ZB的均值Ceanom为-0.08-0.10,推断湘江湘潭段河岸沉积物在沉积时为缺氧的还原环境;XS、ZB两地沉积物的整体沉积速率稍有差异,相比而言ZB可能更接近物源区。高场强元素分析可知:河岸沉积物中所有的高场强元素垂直变化特征不明显。(3)重金属元素统计结果显示:湘江湘潭段河岸沉积物中Zn、Pb两种元素显著富集,Mn、Ni、Th、U、V几种元素中度富集,Ba、Sc、Cr几种元素无明显富集特征。地累积指数法表明:湘江湘潭段河岸沉积物中普遍存在Zn、Pb、Cu几种重金属元素污染危害,多数元素Ba、Sc、V、Cr、Co、Ni、Th、U不存在污染危害。沉积物的Fe2O3、LOI、∑REE等的含量值,及Eu/Eu*值可作为指示沉积物重金属污染的地球化学指标,对该段河岸沉积物中重金属污染有一定的指示作用。(4)主元素与重金属元素的Pearson相关性分析显示,Th、U两种元素主要赋存于石英等碎屑矿物中,这些微量金属元素可能主要为自然源,在沉积物中化学性质相对稳定;而Ba、Sc、V、Mn、Co、Cr、Cu、Pb、Zn等重金属元素则主要赋存于铁、锰氧化物矿物相中,这些重金属可能以人为源为主,他们在沉积物中有一定的化学活性,可发生活化迁移。
[Abstract]:In this study, XRF (X-ray fluorescence) and ICP-MS (Inductively coupled Plasma Mass Spectrometer) techniques were used to measure the principal and trace elements in the river sediment (XS,ZB) of Xiangtan section of Xiangjiang River. Stepwise regression and Pearson correlation analysis were used to analyze the riverbank sediments of Xiangtan section of the Xiangjiang River. The conclusions are as follows: (1) Si O _ 2, K _ 2O and TIO _ 2 are relatively stable in the riverbank sediments; The two elements of Na2O,MnO and LOI components are relatively active, and the main elements are characterized by the chemical composition of Fe2O3,MnO and other oxides, which are obviously poor in basic components such as Na2O,CaO,MgO and so on. Al2O3,MgO,P2O5 and LOI have obvious grain size effect in the sediments studied, but TiO2,Fe2O3,MnO,K2O et al have no obvious grain size effect. The characteristics of major elements indicate that the main provenance of sediments is the weathering products of granite upstream. (2) the characteristics of rare earth elements indicate that: La,Ce,Pr,Nd, in sediments The average content and coefficient of variation of 14 rare earth elements, such as Sm and other rare earth elements, increased significantly from XS to ZB. Compared with the reference bodies such as the upper crust, the Yangtze River sediments and the Yangtze River suspended matter, the REE partition model curve of the riverbank sediments is typical granite partition model. The mean Ceanom of XS,ZB is-0.08 ~ 0.10. It is inferred that the sediment in Xiangtan section of Xiangjiang River is a deoxidization environment of anoxia, and the overall deposition rate of sediment in XS,ZB is slightly different, compared with ZB, ZB may be closer to provenance area than that in Xiangtan section of Xiangjiang River. The analysis of high field strength elements shows that the vertical variation characteristics of all high field strength elements in river bank sediments are not obvious. (3) the statistical results of heavy metal elements show that the two elements of Zn,Pb are enriched significantly in the river bank sediments of Xiangtan section of Xiangjiang River, and the Mn,Ni, is found in the sediments of Xiangtan section of Xiangtan River. Some elements of Th,U,V were moderately enriched, while some elements of Ba,Sc,Cr had no obvious enrichment characteristics. The method of land accumulation index shows that several heavy metal elements (Zn,Pb,Cu) are common in the sediments of Xiangtan section of Xiangjiang River, and most of the elements Ba,Sc,V,Cr,Co,Ni,Th,U do not exist pollution hazards. The contents of Fe2O3,LOI, 鈭，
本文编号：2435988
[Abstract]:In this study, XRF (X-ray fluorescence) and ICP-MS (Inductively coupled Plasma Mass Spectrometer) techniques were used to measure the principal and trace elements in the river sediment (XS,ZB) of Xiangtan section of Xiangjiang River. Stepwise regression and Pearson correlation analysis were used to analyze the riverbank sediments of Xiangtan section of the Xiangjiang River. The conclusions are as follows: (1) Si O _ 2, K _ 2O and TIO _ 2 are relatively stable in the riverbank sediments; The two elements of Na2O,MnO and LOI components are relatively active, and the main elements are characterized by the chemical composition of Fe2O3,MnO and other oxides, which are obviously poor in basic components such as Na2O,CaO,MgO and so on. Al2O3,MgO,P2O5 and LOI have obvious grain size effect in the sediments studied, but TiO2,Fe2O3,MnO,K2O et al have no obvious grain size effect. The characteristics of major elements indicate that the main provenance of sediments is the weathering products of granite upstream. (2) the characteristics of rare earth elements indicate that: La,Ce,Pr,Nd, in sediments The average content and coefficient of variation of 14 rare earth elements, such as Sm and other rare earth elements, increased significantly from XS to ZB. Compared with the reference bodies such as the upper crust, the Yangtze River sediments and the Yangtze River suspended matter, the REE partition model curve of the riverbank sediments is typical granite partition model. The mean Ceanom of XS,ZB is-0.08 ~ 0.10. It is inferred that the sediment in Xiangtan section of Xiangjiang River is a deoxidization environment of anoxia, and the overall deposition rate of sediment in XS,ZB is slightly different, compared with ZB, ZB may be closer to provenance area than that in Xiangtan section of Xiangjiang River. The analysis of high field strength elements shows that the vertical variation characteristics of all high field strength elements in river bank sediments are not obvious. (3) the statistical results of heavy metal elements show that the two elements of Zn,Pb are enriched significantly in the river bank sediments of Xiangtan section of Xiangjiang River, and the Mn,Ni, is found in the sediments of Xiangtan section of Xiangtan River. Some elements of Th,U,V were moderately enriched, while some elements of Ba,Sc,Cr had no obvious enrichment characteristics. The method of land accumulation index shows that several heavy metal elements (Zn,Pb,Cu) are common in the sediments of Xiangtan section of Xiangjiang River, and most of the elements Ba,Sc,V,Cr,Co,Ni,Th,U do not exist pollution hazards. The contents of Fe2O3,LOI, 鈭，
本文编号：2435988
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