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首页> 外文期刊>American Journal of Environmental Sciences >Heavy Metals Content of the Grassland Soil around Katima Mulilo Municipal Solid Wastes Dumpsite, Namibia
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Heavy Metals Content of the Grassland Soil around Katima Mulilo Municipal Solid Wastes Dumpsite, Namibia

机译：纳米比亚卡蒂玛穆利洛市政固体垃圾场附近草原土壤的重金属含量

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The effects of open wastes dumpsites on the immediate vicinity continue to generate safety concern. This study determined the levels of lead, chromium, cadmium, arsenic, nickel, cobalt, copper and manganese in soil samples collected at two depths: 0-15 and 15-30 cm within and around Katima Mulilo municipal solid wastes dumpsite and a control site. The samples were digested according to EPA method 3050 B and analyzed using Inductively Coupled Plasma-Optical Emission Spectrophotometer (ICP: Perkin Elmer Optima 7000 DV). The results obtained revealed that manganese recorded the highest mean concentrations varying between 21.95-91.10 and 15.12-122.30 mg kg-1 within the 0-15 and 15-30 cm soil depths respectively while Cd (BDL-0.51 mg kg-1 and BDL-0.86 mg kg-1) recorded the least. The analysis of variance between the mean levels of the heavy metals was statistically significant (p0.05). Assessment of the sampling sites contamination revealed that the Wastes dumpsite Grassland A Grassland B Control site but the current ecological risk indices (0.004-0.824) revealed environmental low risk levels (Er 40). The correlation coefficients of the heavy metals revealed mainly extremely positive correlations (r 0.9). These suggest common source of anthropogenic inputs of the heavy meals. Generally, the mean concentrations of the heavy metals were lower than their corresponding maximum permissible limits recommended by WHO for the protection of human and ecosystem’s health. However, the presence of heavy metals in the human ecosystem is regarded as a potential toxin because metals are persistence, non-degradable and bio-accumulative in nature. Therefore, we recommend periodic monitoring of the heavy metals in the soils and advice precautionary measures to limit excessive human exposures to the metal contents.
机译：露天垃圾场在附近地区的影响继续引起安全隐患。这项研究确定了在两个深度（Katima Mulilo市政固体垃圾堆放场和控制场内和周围）的0-15和15-30 cm深度处收集的土壤样品中铅，铬，镉，砷，镍，钴，铜和锰的含量。 。根据EPA方法3050 B消化样品，并使用感应耦合等离子体发射分光光度计（ICP：Perkin Elmer Optima 7000 DV）进行分析。获得的结果表明，在0-15和15-30 cm的土壤深度中，锰的最高平均浓度分别在21.95-91.10和15.12-122.30 mg kg-1之间，而Cd（BDL-0.51 mg kg-1和BDL-最低记录为0.86 mg kg-1）。重金属平均含量之间的方差分析具有统计学意义（p <0.05）。对采样点污染的评估表明，垃圾场>草地A>草地B>对照点，但当前的生态风险指数（0.004-0.824）显示环境低风险水平（Er <40）。重金属的相关系数主要显示出极强的正相关（r> 0.9）。这些暗示了人为饮食的常见来源。通常，重金属的平均浓度低于世界卫生组织为保护人类和生态系统健康而建议的相应最大允许限值。但是，由于金属具有持久性，不可降解性和生物蓄积性，因此人类生态系统中重金属的存在被认为是潜在的毒素。因此，我们建议对土壤中的重金属进行定期监测，并建议采取预防措施，以限制人类过多地接触金属。

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