ABSTRACT

The study assessed the concentration and health hazards of Cd, Mn, Pb, Ni and Zn in 54 road surface dust samples. Heavy metal concentrations descended as follows: Mn > Zn > Pb > Ni > Cd and the concentrations were 316.22, 161.24, 88.76, 22.69 and 0.21. Health hazard assessment showed that the modes of exposure descended in the sequence of ingestion > dermal contact > inhalation for children and dermal contact > ingestion > inhalation for adults. The hazard index for both populations was >1 suggesting susceptibility to non-cancer risks. The carcinogenic risk for Ni and Cd was below 1 × 10⁻⁴ suggesting a negligible risk of cancer for both populations. The study suggests that more research studies on HM contamination in road dusts are to be undertaken in the country to develop HM pollution threshold values in road dusts and to account for pollution in city centers.

摘要

该研究评估了 54 个路面灰尘样品中 Cd、Mn、Pb、Ni 和 Zn 的浓度和健康危害。重金属浓度依次下降：Mn > Zn > Pb > Ni > Cd，浓度分别为316.22、161.24、88.76、22.69和0.21。健康危害评估显示，儿童接触方式依次为食入>皮肤接触>吸入，成人为皮肤接触>食入>吸入。两个人群的危险指数均 > 1，表明对非癌症风险的易感性。Ni和Cd的致癌风险低于1×10 ^-4表明这两个人群患癌症的风险可以忽略不计。该研究表明，该国需要对道路灰尘中的 HM 污染进行更多的研究，以制定道路灰尘中的 HM 污染阈值并解释城市中心的污染。