北京市區(qū)表層土壤稀土元素空間分布特征研究
發(fā)布時間：2019-01-01 17:31
【摘要】：土壤稀土元素作為反映土壤污染的指標之一,識別其空間分布特征及來源對于客觀評價城市表層土壤污染水平、制定治理方案具有重要意義。為研究北京市區(qū)表層土壤稀土元素的空間分布特征,于2014年3月15日系統(tǒng)采集46個表層土樣,并用電感耦合等離子體質(zhì)譜儀測定10種稀土元素(La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy和Sc)的含量。采用統(tǒng)計分析和地統(tǒng)計方法對北京市區(qū)表層土壤稀土元素的變化趨勢及空間分布進行研究,并對表層土壤和大氣降塵中稀土元素進行Pearson相關(guān)性分析,結(jié)果表明,(1)北京市區(qū)表層土壤呈輕稀土富集型,稀土元素主要污染點位于海淀區(qū)周家巷橋和西直門外大街采樣點,表層土壤與大氣降塵中的稀土元素相關(guān)系數(shù)介于0.873~0.946之間,相關(guān)性顯著�？傮w上,北京市區(qū)表層土壤稀土元素污染較輕。(2)各采樣點δCe和δEu的變化范圍分別為0.85~0.98和0.63~0.82,說明稀土元素Ce無顯著異常,稀土元素Eu負異常,虧損較大。(3)大部分稀土元素(La、Ce、Nd、Sm、Gd、Eu和Dy)在東西方向和南北方向均呈現(xiàn)先減少后增加的趨勢,最低值出現(xiàn)在東西方向和南北方向的中心位置。(4)富集因子表明北京市區(qū)表層土壤中各稀土元素受人為因素影響較小,為弱污染。主成分分析結(jié)果表明,煤炭燃燒和汽車尾氣的排放,煤炭燃燒、工業(yè)生產(chǎn)和農(nóng)業(yè)化肥的使用可能分別是四環(huán)線內(nèi)、外各稀土元素的主要人為來源。
[Abstract]:As one of the indicators to reflect soil pollution, it is important to identify the spatial distribution characteristics and sources of soil rare earth elements in order to objectively evaluate the level of urban surface soil pollution and to formulate control schemes. In order to study the spatial distribution characteristics of rare earth elements in the surface soil of Beijing urban area, 46 surface earth samples were collected on March 15, 2014, and 10 rare earth elements (La,Ce,Pr,Nd,Sm,Eu,Gd,) were determined by inductively coupled plasma mass spectrometer (ICP-MS). Tb,Dy and Sc. The change trend and spatial distribution of rare earth elements in surface soil of Beijing urban area were studied by means of statistical analysis and geostatistics. Pearson correlation analysis of rare earth elements in surface soil and atmospheric dust was carried out. The main results are as follows: (1) the surface soil of Beijing urban area is enriched with light rare earth elements. The main pollution sites of rare earth elements are located at the sampling points of Zhoujiaxiang Bridge and Xizhimen Street in Haidian District. The correlation coefficient between the surface soil and the rare earth elements in the atmospheric dust fall is between 0.873and 0.946. The correlation is significant. In general, the pollution of rare earth elements in the topsoil of Beijing urban area is relatively light. (2) the range of 未 Ce and 未 Eu in each sampling point are 0.85 ~ 0.98 and 0.63 ~ 0.82, respectively, indicating that there is no significant anomaly of rare earth element Ce, and the rare earth element Eu is negative anomaly. (3) most rare earth elements (La,Ce,Nd,Sm,Gd,Eu and Dy) show a tendency of decreasing first and then increasing in east-west and north-south directions. The lowest values appear in the central position of east-west direction and north-south direction. (4) the enrichment factor indicates that the rare earth elements in the topsoil of Beijing urban area are less affected by human factors and are weak pollution. The results of principal component analysis show that coal combustion and automobile exhaust emissions, coal combustion, industrial production and the use of agricultural chemical fertilizers may be the main human sources of each rare earth element in the four rings.
【作者單位】： 首都師范大學資源環(huán)境與地理信息系統(tǒng)北京市重點實驗室;城市環(huán)境過程與數(shù)字模擬國家重點實驗室培育基地;
【基金】：國家青年科學基金項目(411014404) 北京市教委科技計劃項目(KM201110028013);北京市教委學科建設(shè)與研究生教育建設(shè)項目(028-145321400)
【分類號】：X53
[Abstract]:As one of the indicators to reflect soil pollution, it is important to identify the spatial distribution characteristics and sources of soil rare earth elements in order to objectively evaluate the level of urban surface soil pollution and to formulate control schemes. In order to study the spatial distribution characteristics of rare earth elements in the surface soil of Beijing urban area, 46 surface earth samples were collected on March 15, 2014, and 10 rare earth elements (La,Ce,Pr,Nd,Sm,Eu,Gd,) were determined by inductively coupled plasma mass spectrometer (ICP-MS). Tb,Dy and Sc. The change trend and spatial distribution of rare earth elements in surface soil of Beijing urban area were studied by means of statistical analysis and geostatistics. Pearson correlation analysis of rare earth elements in surface soil and atmospheric dust was carried out. The main results are as follows: (1) the surface soil of Beijing urban area is enriched with light rare earth elements. The main pollution sites of rare earth elements are located at the sampling points of Zhoujiaxiang Bridge and Xizhimen Street in Haidian District. The correlation coefficient between the surface soil and the rare earth elements in the atmospheric dust fall is between 0.873and 0.946. The correlation is significant. In general, the pollution of rare earth elements in the topsoil of Beijing urban area is relatively light. (2) the range of 未 Ce and 未 Eu in each sampling point are 0.85 ~ 0.98 and 0.63 ~ 0.82, respectively, indicating that there is no significant anomaly of rare earth element Ce, and the rare earth element Eu is negative anomaly. (3) most rare earth elements (La,Ce,Nd,Sm,Gd,Eu and Dy) show a tendency of decreasing first and then increasing in east-west and north-south directions. The lowest values appear in the central position of east-west direction and north-south direction. (4) the enrichment factor indicates that the rare earth elements in the topsoil of Beijing urban area are less affected by human factors and are weak pollution. The results of principal component analysis show that coal combustion and automobile exhaust emissions, coal combustion, industrial production and the use of agricultural chemical fertilizers may be the main human sources of each rare earth element in the four rings.
【作者單位】： 首都師范大學資源環(huán)境與地理信息系統(tǒng)北京市重點實驗室;城市環(huán)境過程與數(shù)字模擬國家重點實驗室培育基地;
【基金】：國家青年科學基金項目(411014404) 北京市教委科技計劃項目(KM201110028013);北京市教委學科建設(shè)與研究生教育建設(shè)項目(028-145321400)
【分類號】：X53
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