CAO Jingli，WANG Mingshi，GUI Chenlu， LIU Yanping，SONG Dangyu

(Institute of Resource and Environment, Henan Polytechnic University, Jiaozuo 454003, China)

Abstract: Concerning schools in the urban, peri-urban, and rural areas of Jiaozuo, the heavy metal contents in soils from selected school areas were measured and health risks were assessed by enrichment factor analyses. The results showed that average concentrations of Zn, Cr, Ni and Cu in soils were 142, 65, 31, 22 mg/kg, respectively, higher than soil background values of the Henan Province. Enrichment factor analyses showed that, except the Jiaozuo Xiwangshiyan school area significantly enriched Zn, heavy metals pollutions in the selected school area were slight. The pollution levels followed a trend of Peri-urban schools > urban schools >rural schools. The health risk assessment results showed that the non carcinogenic risks (HI) of all heavy metals were lower than 1 and ranked as Cr > Ni > Cu > Zn, indicated no none carcinogenic risk was found, and that the total carcinogenic risk (TCR) of Cr was greater than 10-4, indicated a considerable carcinogenic risk, the TCR of Ni was between 10-6-10-4, indicated an acceptable carcinogenic risk. In terms of the exposure pathway, the exposure risks for both non-carcinogenic and carcinogenic were hand-mouth intake > skin intake > breath intake; in terms of site types, the order was Peri-urban schools > urban schools > rural schools for both non-carcinogenic and carcinogenic risks.

Key words: Jiaouzo; soil; heavy mental; health risk assessment

EARTH AND ENVIRONMENT Vol.46, No.3, Tot No.323, 2018, Page 296-305