Abstract:Recently, bioaccessibility of metals has been applied for assessing the health risk of field soils, however the bioaccessibility of metals is varied and there are few studies on the toxic effects of bioaccessible metals on human body. In this study, fives soil samples (S1-S5) from an electronic disassembly plant in Wenling, Zhejiang Province were sampled. The total concentrations and bioaccessibility of Zn, Cu, Cd and Pb in the soils were determined. Moreover, the toxic effects of bioaccessible heavy metals on human intestinal epithelial cells were also evaluated. The results demonstrated that all samples were polluted by Cd, Pb, Zn, and Cu, with the greatest concentrations of Cd (4.84mg/kg) and Cu (438.52mg/kg). The bioaccessibility of the four heavy metals in the gastric and intestinal phase was 2.10%~48.28%, 4.84%~33.73%, 16.04%~42.81%, 1.81%~15.71%, and 2.05%~36.91%, 13.17%~22.23%, 10.19%~23.10%, 0.60%~2.69%, respectively. In general, the bioaccessibility of four heavy metals in the gastric phase was lower than that in the intestine phase. After exposure to intestinal bioaccessible extracts of different soils for 24h, cell viability significantly decreased except for sample S4. In addition, there was no significant change in SOD activity after treatment with S3 and S5samples, but CAT activity was decreased. Furthermore, DNA damage was trigged by those samples. To investigate the bioaccessibility and its toxic effects of fields soils, this study provides a scientific basis for the health risk assessment of soil in China.
马娇阳, 田稳, 王坤, 保欣晨, 汪洁, 崔道雷, 向萍. 污染场地土壤重金属的生物可给性及毒性研究[J]. 中国环境科学, 2021, 41(10): 4885-4893.
MA Jiao-yang, TIAN Wen, WANG Kun, BAO Xin-chen, WANG Jie, CUI Dao-lei, XIANG Ping. Bioaccessibility and their toxic effects of heavy metal in field soils from an electronic disassembly plant. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4885-4893.
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