Environmental Engineering, Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi, India.
Centre for Environmental Sciences, Central University of Jharkhand, Ranchi, India.
Environ Sci Pollut Res Int. 2019 Oct;26(29):30413-30425. doi: 10.1007/s11356-019-06216-5. Epub 2019 Aug 22.
The present study was carried out to determine the contamination levels of heavy metals in road dust of the National Capital Territory of Delhi (NCT), India and its consequent effect on human and environment. The levels of heavy metals (Pb, Zn, Cu, Cr, Ni, Mn, and Fe) in 9 districts (Z1-Z9) of NCT were monitored and the corresponding human health risk was estimated. District-wise evaluation of heavy metal pollution in the road dust was performed. The mean concentrations of Pb, Zn, Cu, Ni, Cr, Mn, and Fe in the road dust samples over the study area were 164.2 ± 53.2, 200.7 ± 45.3, 99.9 ± 64.8, 24.7 ± 5.7, 57.7 ± 25.9, 241.4 ± 39.8, and 11113.9 ± 1669.7 mg kg, respectively. PLI showed a high pollution load in the monitored nine locations, indicating an alarming condition and the urgent need for immediate remedial actions. Ecological risk assessment depicted that a 74% risk was attributed to Pb. Hazard quotient (HQ) values indicated that ingestion was the major pathway of road dust heavy metal exposure to human beings. Hazard index values showed that there was no probable non-carcinogenic risk of the heavy metals present in the road dust of the area. Children were found vulnerable to the risks of road dust metals. The findings of this study showed the alarming status of heavy metal contamination to road dust in NCT and the associated risk to human health.
本研究旨在测定印度德里国家首都辖区（NCT）道路灰尘中重金属的污染水平及其对人类和环境的影响。监测了 NCT 的 9 个区（Z1-Z9）的重金属（Pb、Zn、Cu、Cr、Ni、Mn 和 Fe）水平，并估计了相应的人类健康风险。对道路灰尘中重金属污染进行了区际评估。研究区域内道路灰尘样本中 Pb、Zn、Cu、Ni、Cr、Mn 和 Fe 的平均浓度分别为 164.2±53.2、200.7±45.3、99.9±64.8、24.7±5.7、57.7±25.9、241.4±39.8 和 11113.9±1669.7mgkg。PLI 在监测的九个地点显示出高污染负荷，表明情况令人担忧，急需立即采取补救措施。生态风险评估表明，Pb 造成了 74%的风险。危害系数（HQ）值表明，摄入是人类接触道路灰尘重金属的主要途径。危害指数值表明，该地区道路灰尘中存在的重金属没有可能的非致癌风险。儿童被发现容易受到道路灰尘金属的风险的影响。这项研究的结果表明，NCT 道路灰尘中重金属污染状况令人震惊，对人类健康存在相关风险。
