State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China.
School of Resources and Environment, Anhui Agricultural University, 230036, Hefei, PR China.
Environ Res. 2020 Sep;188:109661. doi: 10.1016/j.envres.2020.109661. Epub 2020 May 19.
Petrochemical industries are widely distributed in China. As a negative consequence, heavy metals in petrochemical area can result in soil contamination. However, the relevant research of heavy metals contamination in petrochemical area was few. In this study, a total of 103 topsoil samples (<20 cm) and 25 profile soil samples were collected and examined in a retired petrochemical industrial area, South China. The results showed the mean contents of Hg, Cd, As, Pb, Ni and Cu were 0.18, 0.69, 16.22, 47.24, 31.62 and 93.06 mg kg, respectively. The spatial distribution of six metals in topsoil was largely attributed to the industrial activities during the petroleum refining and transshipment process. Ni was the main pollutant in the petroleum refining process. While, the contamination of other metals mainly were caused by the leakage of the oil during transshipment. The migration of six metals to subsoil layers was also observable. In accordance, Hg, Cd, As, Pb, Cu, and Ni dropped by 95.02, 71.91, 89.45, 90.88, 99.22, and 65.07%, respectively, compared to their contents in topsoil. The contamination of the heavy metals was mainly caused during the process of petroleum refining and transshipment. The distribution of heavy metals in the factory was mainly affected by the industrial activities or the lateral infiltration of Lianhuashan River. Soil ingestion was the primary pathway for children and adults exposure to heavy metals. The total non-cancer human health risk induced by heavy metals was within the limit of USEPA (10 a). While the cancer risks alone induced by As through soil ingestion to children was 1.14 × 10 a, which exceeded the limit of USEPA. This study indicated that not only petroleum hydrocarbon but also heavy metals can cause soil contamination in a retired petrochemical industrial area, which provides a novel cognition. Altogether, measures should be taken in practice to substantially improve the soil quality in petrochemical industrial area.
石化工业在中国广泛分布。作为一个负面影响，石化区域的重金属可能导致土壤污染。然而，关于石化区域重金属污染的相关研究较少。本研究共采集和检测了华南一个已停产的石化工业区 103 个表层土壤(<20cm)和 25 个剖面土壤样品。结果表明，Hg、Cd、As、Pb、Ni 和 Cu 的平均含量分别为 0.18、0.69、16.22、47.24、31.62 和 93.06mgkg。在表层土壤中，六种金属的空间分布主要归因于石油炼制和转运过程中的工业活动。Ni 是石油炼制过程中的主要污染物。而其他金属的污染主要是由于转运过程中油的泄漏造成的。六种金属向亚土层的迁移也是可以观察到的。相应地，Hg、Cd、As、Pb、Cu 和 Ni 分别比表层土壤中的含量下降了 95.02%、71.91%、89.45%、90.88%、99.22%和 65.07%。重金属的污染主要发生在石油炼制和转运过程中。工厂内重金属的分布主要受工业活动或莲华山侧向渗透的影响。土壤摄入是儿童和成人接触重金属的主要途径。重金属对非癌症人群的总健康风险低于 USEPA（10a）的限值。然而，儿童通过土壤摄入摄入 As 所导致的癌症风险为 1.14×10a，超过了 USEPA 的限值。本研究表明，不仅石油烃而且重金属都可以导致已停产的石化工业区的土壤污染，这提供了一个新的认识。总之，应该采取措施在实践中大幅提高石化工业区的土壤质量。
Zotero 插件