• 研究报告 •

### 黔西南煤矿区村寨公路边地表灰尘有害元素风险评价

1. (1贵州师范大学贵州省山地环境信息系统与生态环境保护重点实验室， 贵阳 550001； 2贵州民族大学化学与生态环境工程学院， 贵阳 550025)
• 出版日期:2017-10-10 发布日期:2017-10-10

### Risk assessment of harmful elements in rural road surface dust in vicinity of a coal mining area in southwest Guizhou, China.

LÜ Ya-chao1, WANG Zhi-kang2, QIN Fan-xin1*, LI Ying-ju1, LI Xin-li1, Li Gang1#br#

1. (1Guizhou Provincial Key Laboratory for Information System of Mountainous Areas and Protection of Ecological Environment, Guizhou Normal University, Guiyang 550001, China; 2School of Chemistry and EcoEnvironmental Engineering, Guizhou Minzu University, Guiyang 550025, China).
• Online:2017-10-10 Published:2017-10-10

Abstract: To evaluate the pollution of harmful elements (Cr, Cu, Zn, As, Cd, Pb and Ni) from road dust in vicinity of the coal mining area near rural area in southwest Guizhou Province, China, 36 dust samples in rural roads were collected. The leaching contents of harmful elements were quantitatively extracted by the method of toxicity characteristic leaching procedure (TCLP). Nemerow comprehensive pollution index (P) and Hkanson index were subsequently calculated to assess the ecological risk. The results showed that the TCLP leaching contents of the total harmful elements were in the range of 1.73%-21.12%. Nemerow comprehensive pollution index (P) results indicated that Pb was at heavy pollution level, As at moderate pollution level, Cr and Cu at mild pollution level, Cd and Zn at the alert level, and Ni at safety level. The potential ecological risk index (Ei) results manifested that Cd achieved strong ecological risk level, As was at the medium level, and other elements belonged to the slight ecological risk level. The total potential ecological risk index (RI) value reached 321.85, which indicated a strong potential of ecological risk. Furthermore, the SBET (simple bioaccessibility extraction test) method was used to evaluate bio-accessibility of harmful elements in the road dust samples, and human exposure risk assessment method adopted by the United States Environmental Protection Agency (USEPA) was used to estimate their health risk after oral intake. The results showed that the average bioavailability of harmful elements in dust were in the range of 7.32%-31.06%. For human health, total carcinogenic risk (TCR) indexes for children and adults were 5.91×10-5 and 2.15×10-5, respectively. The potential non-carcinogenic risk (HQ) index of the human body was not significant except for As. The total noncarcinogenic risk (HI) indexes of the harmful elements in road dusts for children and adults were 1.30 and 0.16, respectively, which may pose a potential non-carcinogenic hazard to children. In conclusion, the risk level of Pb, As and Cd in road dusts in rural areas investigated by this study was significant, and should be highly concerned.