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      2. 基于標準化方法和統計分析法的土壤重金屬環境基線值分析比較
        DOI:
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        作者單位:

        1.湖北省生態環境監測中心站湖北武漢;2.國土資源部稀土稀有稀散礦產重點實驗室

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        中圖分類號:

        X 53; X820.4

        基金項目:

        國家環保公益性科研項目(201509031);2017年土壤污染防治專項湖北省土壤污染風險評估與成因研究項目


        Analysis and comparison of environmental baseline values of heavy metals in soils based on standardized methods and statistical methods
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        Affiliation:

        Hubei Environmental Monitoring Center Station

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          摘要:

          :[目的] 通過監測研究區域208個表層土壤重金屬Cd、Hg、As、Pb、Cr、Cu、Ni、Zn的含量水平,獲得區域表層土壤重金屬元素環境基線值,以及區域表層土壤重金屬元素環境基線值相對于本底值的變化累積情況,以此來判斷區域表層土壤重金屬元素受人為活動的擾動程度。[方法] 采用標準化方法和相對累積頻率統計方法,計算基于兩種方法的重金屬環境基線值及偏差,以兩種方法獲得的重金屬環境基線值平均值作為研究區域表層土壤重金屬元素環境基線值。[結果] 研究區域監測點位表層土壤重金屬Cd、Hg、As、Pb、Cr、Cu、Ni、Zn的含量水平都未超過農用地土壤污染風險篩選值;兩種方法獲得的區域表層土壤重金屬Cd、Hg、As、Pb、Cr、Cu、Ni、Zn的環境基線值平均值分別為0.22 mg/kg、0.09 mg/kg、13.34 mg/kg、30.7 mg/kg、82.0 mg/kg、29.7 mg/kg、38.0 mg/kg、89.1 mg/kg;相對偏差范圍在0.5%~12.0%。[結論] 研究區域表層土壤環境質量整體良好,表層土壤重金屬Cd、Hg、As、Pb、Cr、Cu、Ni、Zn環境基線值相對于本底值有不同程度的增大,但變化率都小于50%,增加幅度不顯著;其中,Cd的累計指數評價等級達到輕度累積,其它重金屬元素為無明顯累積,說明研究區域表層土壤重金屬元素已經受到一定程度的人為因素干擾,影響程度較小。

          Abstract:

          Abstract:[Objectives] The content levels of heavy metals Cd, Hg, As, Pb, Cr, Cu, Ni and Zn in 208 surface soils in the study area were detected. The environmental baseline value of heavy metal elements and the accumulation of changes relative to background values were obtained in regional surface soil. Based on this, the disturbance degree of heavy metal elements in regional surface soil by human activities can be judged. [Methods] Standardized method and relative cumulative percentage statistical method were used to calculate the environmental baseline value and deviation of heavy metals in regional surface soil. The average environmental baseline values obtained by these two methods were taken as the environmental baseline values of heavy metals in the surface soil of the study area. [Results] The content levels of heavy metals Cd, Hg, As, Pb, Cr, Cu, Ni and Zn in the surface soil of the monitoring points in the study area were not exceed the risk screening values for soil contamination of agricultural land. The environmental baseline values of heavy metals Cd, Hg, As, Pb, Cr, Cu, Ni and Zn obtained by these two methods were 0.22 mg/kg, 0.09 mg/kg, 13.34 mg/kg, 30.7 mg/kg, 82.0 mg/kg, 29.7 mg/kg, 38.0 mg/kg and 89.1 mg/kg respectively. The relative deviation ranged from 0.5% to 12.0%. [Conclusions] The environmental quality was generally good of regional surface soil. Compared with the background value, the environmental baseline value increased in different degrees of heavy metals Cd、Hg、As、Pb、Cr、Cu、Ni、Zn in regional surface soil, but the change rate was less than 50%, and the increase was not significant. Among them, the cumulative index evaluation grade of Cd reached slight accumulation, while other heavy metals elements had no obvious accumulation. This shows that heavy metal elements in the surface soil of the study area have been disturbed by human factors to a certain extent, and the influence degree was slight.

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        • 收稿日期:2020-06-22
        • 最后修改日期:2020-07-16
        • 錄用日期:2020-07-27
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