高架道路周邊建筑物灰塵重金屬污染風險:以常州市為例
[Abstract]:126 dust samples were collected from different floors of 6 residential areas on both sides of Changzhou Huancheng Viaduct. The contents of Cu,Zn,Pb,Cd,Ni and Cr were measured, and their chemical morphology and vertical distribution characteristics were analyzed. Enrichment coefficient and risk assessment index were used to evaluate the pollution degree and bioavailability, and potential ecological risk assessment and health risk assessment were carried out. The results showed that the average contents of Cu,Zn,Pb,Cd,Ni and Cr in dust were 181.95709.99211.24, and 2.76101.59 and 257.55mg kg-1, were much higher than the background values, respectively. The enrichment coefficient of Cd in dust is 33.05, the enrichment degree is strong, and the enrichment degree of Cu,Pb and Zn is significantly enriched. They may be affected by the comprehensive influence of natural sources, traffic sources and regional waste gas transport, while the enrichment coefficients of Ni and Cr are low. It may be mainly affected by natural sources. With the increase of floor height, the content of Cd increased, the content of Pb and Zn increased at first and then decreased, but the content of Cu did not change significantly. Zn, Cd,Cu and Pb mainly existed in active state, bioavailability was higher, Ni and Cr were mainly residual. Bioavailability is low. The results of improved potential ecological risk assessment show that the potential ecological risk of Cd is very high, which plays a leading role in the potential ecological risk of multi-element, and the potential ecological risk to high-rise buildings is large, and the potential ecological risk of other heavy metals is medium and low. The results of health risk assessment showed that the carcinogenic risk of Cr in children exceeded the safety threshold, and the carcinogenic and non-carcinogenic risks of other heavy metals to adults and children were within the safety domain.
【作者單位】: 常州大學環(huán)境與安全工程學院;
【基金】:國家自然科學基金項目(41641032) 江蘇省政策引導類計劃(產學研合作)——前瞻性聯(lián)合研究項目(BY2015027-08) 江蘇省高!扒嗨{工程”項目
【分類號】:X513
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