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首页> 外文期刊>Soil & Sediment Contamination >An investigation of the soil property changes and heavy metal accumulation in relation to long-term wastewater irrigation in the semi-arid region of Iran.
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An investigation of the soil property changes and heavy metal accumulation in relation to long-term wastewater irrigation in the semi-arid region of Iran.

机译：伊朗半干旱地区与长期污水灌溉有关的土壤性质变化和重金属积累的调查。

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Concentrations and spatial distribution of Zn, Cu, Cd, and Pb along two landscapes including a wastewater-irrigated area and a control area were determined to assess the impact of long-term wastewater irrigation and landscape properties on heavy metal contamination. Some disturbed and undisturbed soil samples were taken from soil trenches and soil cores, located on three main landscape positions (upper slope, midslope, and lower slope) in northwestern Iran. The investigation showed that the mean concentration of the heavy metals followed the order Zn > Cu > Pb > Cd in the wastewater-irrigated soil and Pb > Zn > Cu > Cd in the control soils. On average, compared to similar positions in the control region, the wastewater-irrigated regions contained 3.0 (midslope) to 4.9 (lower slope), 2.7 (midslope) to 4.6 (lower slope), 3.3 (upper slope) to 4.1 (lower slope), and 1.7 (upper slope) to 2.6 (lower slope) times higher amounts of Zn, Cu, Cd, and Pb, respectively. Significant positive relationships (P<0.05) were recorded between the heavy metals concentration with <0.002 mm particle-size fraction and organic matter content, the fractions linked to runoff and soil erosion. It is believed that the two soil fractions play a crucial role in the distribution of the metals along the wastewater-irrigated landscape. Despite the significant increase of heavy metals (P<0.05) in the wastewater-irrigated soils compared with control soils, the concentration of all evaluated metals was below the maximum accepted limits (Zn<300 mg/kg, Cu<100 mg/kg, Cd<5 mg/kg, and Pb<100 mg/kg), and grouped as "not-enriched" to "moderately-enriched" categories regarding the topsoil enrichment index. Overall, the lower slope was shown to be more contaminated with the heavy metals compared to the other positions.
机译：确定了两个景观区（包括废水灌溉区和控制区）中Zn，Cu，Cd和Pb的浓度和空间分布，以评估长期废水灌溉和景观特性对重金属污染的影响。从位于伊朗西北部三个主要景观位置（上坡度，中坡度和下坡度）的土壤沟渠和土壤芯中获取了一些扰动且不受干扰的土壤样本。研究表明，污水灌溉土壤中重金属的平均浓度依次为Zn> Cu> Pb> Cd，对照土壤中Pb> Zn> Cu> Cd。平均而言，与控制区的类似位置相比，废水灌溉区的水位为3.0（中坡）至4.9（下坡），2.7（中坡）至4.6（下坡），3.3（上坡）至4.1（下坡） ）和1.7（上斜率）至2.6（下斜率）分别乘以较高含量的Zn，Cu，Cd和Pb。记录了<0.002 mm粒径分数的重金属浓度与有机物含量之间的显着正相关（ P <0.05），这些分数与径流和土壤侵蚀有关。可以认为，这两种土壤组分在污水灌溉景观中的金属分布中起着至关重要的作用。尽管与对照土壤相比，废水灌溉土壤中的重金属含量显着增加（ P <0.05），但所有评估的金属浓度均低于最大可接受限值（Zn <300 mg / kg， Cu <100 mg / kg，Cd <5 mg / kg和Pb <100 mg / kg），并根据表层土壤富集指数分为“未富集”到“中等富集”类别。总体而言，与其他位置相比，较低的坡度显示出更易受到重金属的污染。

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