【摘要】：為了解有色金屬礦區(qū)土壤重金屬形態(tài)及pH值對其遷移的影響,選取對土壤環(huán)境影響較大的Hg、Pb、Zn、Cr、Cd、Cu元素進(jìn)行研究。采用歐共體參比司的三步連續(xù)提取法研究了某鉛鋅礦區(qū)周邊農(nóng)田10個土壤樣品中重金屬的形態(tài)分布,根據(jù)重金屬形態(tài)中酸可提取態(tài)重金屬的百分比,可得6種重金屬的遷移能力大小順序為CdZnCrCuPbHg;用2.3、4.1、5.6、7.2四個不同pH值的淋濾液淋溶尾砂礦柱50 d,檢測數(shù)據(jù)顯示,酸度的提高可以顯著促進(jìn)尾礦砂中重金屬(Pb、Zn、Cu和Cd)的溶出;除Zn元素外,其他元素在50 d內(nèi)的溶出量均隨時間的推移而降低。根據(jù)不同檢測時間段內(nèi)淋溶液溶浸出的重金屬元素含量分析可知,重金屬對酸性淋濾的敏感程度順序為CuPbZnCd。綜合分析得出該農(nóng)田重金屬污染嚴(yán)重程度順序為ZnCdPbCuHgCr。
[Abstract]:In order to understand the effects of heavy metal morphology and pH value on the migration of heavy metals in non-ferrous metal mining areas, the elements of HgPbPbPbZnCrCrOCDCu, which have a great influence on the soil environment, were selected to study the effects of heavy metals on their migration. The speciation and distribution of heavy metals in 10 soil samples from farmland around a lead-zinc mining area were studied by using the three-step continuous extraction method of the European Community reference Company. The percentage of acid-extractable heavy metals in heavy metal forms was determined. The order of migration ability of six heavy metals was CdZnCrCuPbHg, and the leaching of tailings pillar with 2.3L 4.1U 5.67.2 different pH value was used for 50 days. The test data showed that the increase of acidity could significantly promote the dissolution of heavy metals (PbZN Cu and CD) in tailings, except for Zn. The dissolution of other elements decreased with the passage of time. According to the analysis of heavy metal content in leaching solution during different detection periods, the sensitivity of heavy metals to acid leaching is in the order of CuPbZnCd. The order of heavy metal pollution in this farmland is ZnCdPbCuHgCr.
【作者單位】： 中南大學(xué)資源與安全工程學(xué)院;
【基金】：國家自然科學(xué)基金重點項目(51534008)
【分類號】：X53;X753
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本文編號：2154011