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首页> 外文期刊>Journal of soil & sediments >Heavy metal contamination of urban topsoils in a typical region of Loess Plateau, China
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Heavy metal contamination of urban topsoils in a typical region of Loess Plateau, China

机译：黄土高原典型地区城市表层土壤重金属污染

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Purpose Heavy metals pollution of city soil has become a serious environmental issue. Attention has been given to the issue of soil contamination in big cities, but little research has been done in the Loess Plateau, which is the largest loess deposition area in the world. The aim of this study was to assess the contamination of topsoil. Materials and methods Forty soil samples were collected from different districts and sieved through nylon sieves. The coarse particles (2 mm) were used to determine pH and electrical conductivity using a suspension of 1:5 soil to deion-ized water. The fine particles (150 μm) were used to determine soil organic matter and selected heavy metals. Metals were measured in digested solutions by a flame atomic absorption spectrophotometer. Results and discussion The mean concentrations of heavy metals in urban soils in the study area are significantly lower than the mean concentrations across China. The integrated pollution index was determined to be 1.13, indicating moderate pollution. Weathering of parent material, the use of pesticide and fertilizer, discharge of waste from traffic, wastes from commodities and industry, and coal combustion are considered to be the main sources of heavy metal pollution in the study area. Conclusions The results indicate that, at least in the study area, land use greatly influences the soil quality and heavy metal contents in urban topsoils. Soil backfill may change heavy metal contents to some extent. Deep digging and backfill can be effectively used for the remediation of heavy metal contaminated soil and sediments.
机译：目的城市土壤中的重金属污染已成为一个严重的环境问题。大城市已经对土壤污染问题给予了关注，但在黄土高原这一世界上最大的黄土沉积地区，很少进行研究。这项研究的目的是评估表土的污染。材料和方法从不同地区收集40个土壤样品，并通过尼龙筛进行筛分。使用1：5的土壤与去离子水的悬浮液，将粗颗粒（2毫米）用于测定pH和电导率。细颗粒（150μm）用于确定土壤有机质和选定的重金属。通过火焰原子吸收分光光度计在消解的溶液中测量金属。结果与讨论研究区城市土壤中重金属的平均浓度明显低于全国平均水平。综合污染指数确定为1.13，表明中等污染。母体材料的风化，农药和肥料的使用，交通废物的排放，商品和工业废物以及燃煤被认为是研究区域重金属污染的主要来源。结论结果表明，至少在研究区域内，土地利用对城市表土的土壤质量和重金属含量有很大影响。土壤回填可能会在一定程度上改变重金属含量。深挖和回填可有效地用于修复重金属污染的土壤和沉积物。

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