Institute of Soil and Water Resource and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China.
Institute of Soil and Water Resource and Environmental Science, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China.
Ecotoxicol Environ Saf. 2021 Jun 1;215:112102. doi: 10.1016/j.ecoenv.2021.112102. Epub 2021 Mar 13.
Agricultural soils derived from black shale are typically enriched in potentially toxic metals. This is a serious problem, both in terms of the ecological environment and human health. To assess the levels of potentially toxic metals, 90 paired soil-crops samples were collected from the Anji Country, western Zhejiang province, a typical exposed black shale area in China. Concentrations and bioavailability of potentially toxic metals in the soil-crops system were measured, and the associated potential risks were further evaluated. Results showed the enrichment of potentially toxic metals (i.e. Cd, Pb, Cu, Zn and Ni) in the soil and crop samples, especially a significant accumulation of Cd. Sequential extraction data indicated that Cd in soils derived from black shale was the second most dominant element in the exchangeable fraction (mean at 33.42%) and possessed high bioavailability, whereas Pb was mostly retained in the residual fraction (mean at 76.34%) and exhibited low mobility. The total concentration as well as mobility and bioavailability of Cd were the highest in the sampled soils. This resulted in a high potential ecological risk in areas with agricultural soils derived from black shale, which could eventually jeopardize the health of local residents through various exposure pathways. Overall, our findings provide a scientific basis for developing suitable management strategies to mitigate the exposure to potentially toxic metals in high risk areas.
农业土壤源自黑色页岩通常富含潜在毒性金属。这是一个严重的问题，无论是在生态环境还是人类健康方面。为了评估潜在毒性金属的水平，从中国典型的暴露黑色页岩地区——浙江西部安吉县采集了 90 对土壤-作物样本。测量了土壤-作物系统中潜在毒性金属（即 Cd、Pb、Cu、Zn 和 Ni）的浓度和生物可利用性，并进一步评估了相关的潜在风险。结果表明，土壤和作物样本中存在潜在毒性金属（即 Cd、Pb、Cu、Zn 和 Ni）的富集，尤其是 Cd 的显著积累。连续提取数据表明，源自黑色页岩的土壤中 Cd 是可交换部分（平均 33.42%）中第二大主要元素，具有高生物可利用性，而 Pb 主要保留在残余部分（平均 76.34%），移动性低。Cd 的总浓度以及移动性和生物可利用性在采样土壤中最高。这导致了源自黑色页岩的农业土壤地区具有很高的潜在生态风险，最终可能通过各种暴露途径危及当地居民的健康。总的来说，我们的发现为制定适合的管理策略提供了科学依据，以减轻高风险地区潜在毒性金属的暴露。
