PDF(Pubmed)
Abstract：
Land transportation is a major source of heavy metal contamination along the roadside, posing significant risks to human health through inhalation, oral ingestion, and dermal contact. Therefore, this study has been designed to determine the concentrations of vehicular released heavy metals (Cd, Pb, Ni, and Cu) in roadside soil and leaves of two commonly growing native plant species (Calotropis procera and Nerium oleander).Two busy roads i.e., Lahore-Okara road (N-5) and Okara-Faisalabad roads (OFR) in Punjab, Pakistan, were selected for the study. The data were collected from five sites along each road during four seasons. Control samples were collected ~ 50 m away from road. The metal content i.e. lead (Pb), cadmium (Cd) nickel (Ni) and copper (Cu) were determined in the plant leaves and soil by using Atomic Absorption Spectrophotometer (AAS). Significantly high amount of all studied heavy metals were observed in soil and plant leaves along both roads in contrast to control ones. The mean concentration of metals in soil ranged as Cd (2.20-6.83 mg/kg), Pb (4.53-15.29 mg/kg), Ni (29.78-101.26 mg/kg), and Cu (61.68-138.46 mg/kg) and in plant leaves Cd (0.093-0.53 mg/kg), Pb (4.31-16.34 mg/kg), Ni (4.13-16.34 mg/kg) and Cu (2.98-32.74 mg/kg). Among roads, higher metal contamination was noted along N-5 road. Significant temporal variations were also noted in metal contamination along both roads. The order of metal contamination in soil and plant leaves in different seasons was summer > autumn > spring > winter. Furthermore, the metal accumulation potential of Calotropis procera was higher than that of Nerium oleander. Therefore, for sustainable management of metal contamination, the plantation of Calotropis procera is recommended along roadsides.
摘要：
陆路运输是路边重金属污染的主要来源,通过吸入对人类健康构成重大风险，口服摄入，和皮肤接触。因此,这项研究旨在确定车辆释放的重金属(Cd，Pb,Ni,和Cu）在路边的土壤和两种常见的本地植物物种（Calotropisprocera和Nerium夹竹桃）的叶子中。两条繁忙的道路，即旁遮普邦的拉合尔-奥卡拉路（N-5）和奥卡拉-费萨拉巴德路（OFR），巴基斯坦,被选中进行研究。数据是从四个季节沿每条道路的五个地点收集的。在距离道路约50m处收集对照样品。金属含量，即铅(Pb)，利用原子吸收分光光度计（AAS）测定了植物叶片和土壤中的镉（Cd）镍（Ni）和铜（Cu）。与对照相比，在两条道路上的土壤和植物叶片中都观察到了大量的所有研究重金属。土壤中金属的平均浓度为Cd（2.20-6.83mg/kg），铅（4.53-15.29mg/kg），Ni（29.78-101.26mg/kg），和Cu（61.68-138.46mg/kg），植物叶片中Cd（0.093-0.53mg/kg），铅（4.31-16.34mg/kg），Ni(4.13-16.34mg/kg)和Cu(2.98-32.74mg/kg)。在道路中，N-5公路沿线金属污染较高。两条道路上的金属污染也发生了显着的时间变化。不同季节土壤和植物叶片中金属污染的顺序为夏季>秋季>春季>冬季。此外，Calotropisprocera的金属积累潜力高于夹竹桃。因此,金属污染的可持续管理，建议在路边种植Calotropisprocera。
