Zhou Xun, Wang Yao-Ping, Song Zhiguang
Faculty of Chemistry and Environmental Science, Guangdong Ocean University, Zhanjiang 524088, China.
Shenzhen Research Institute of Guangdong Ocean University, Shenzhen 518120, China.
ACS Omega. 2022 Jun 8;7(24):21306-21316. doi: 10.1021/acsomega.2c02516. eCollection 2022 Jun 21.
With the acceleration of industrialization and urbanization, increasing attention has been paid to the problem of heavy metal pollution in mangroves and its ecological restoration. Urban mangroves can be used to measure the impact of human activities on the urban ecological environment because mangroves are sensitive to human activities. However, studies on the evaluation of heavy metal elements in urban mangroves are still limited. Consequently, this study selected the urban mangroves in a central commercial area of Zhanjiang Bay as a case study to investigate the content and distribution of the heavy metals (Co, V, Cu, Pb, Ni, As, Cd, and Hg) in mangrove surface sediments. Risk levels and possible sources of heavy metals were evaluated based on multivariate statistical analysis methods and pollution indices. The results showed that the average concentrations of heavy metals for Co, V, Cu, Pb, Ni, As, Cd, and Hg were 2.91, 29.96, 18.24, 20.07, 7.86, 5.0, 0.20, and 0.09 mg/kg, respectively. Cd, Cu, and Hg were most prominent within the Zhanjiang Bay mangrove sediments, whereas other metals showed a low contamination factor of therm. Cd displayed a high potential ecological risk followed by Hg and Cu. The sampling site, the sewage outlet sampling site, exhibited the highest pollution degree followed by the surrounding area of the sewage outlet sampling site. Those polluted heavy metals could arise from anthropogenic sources, including domestic sewage and automobile exhaust emission. Correlation analysis between the heavy metals and physicochemical properties indicated that fine particles and organic matter play a key role in controlling heavy metal enrichment.
随着工业化和城市化进程的加速，红树林中的重金属污染问题及其生态修复越来越受到关注。城市红树林可用于衡量人类活动对城市生态环境的影响，因为红树林对人类活动敏感。然而，关于城市红树林中重金属元素评价的研究仍然有限。因此，本研究选取湛江湾中心商业区的城市红树林作为案例研究，调查红树林表层沉积物中重金属（钴、钒、铜、铅、镍、砷、镉和汞）的含量和分布。基于多元统计分析方法和污染指数评估了重金属的风险水平和可能来源。结果表明，钴、钒、铜、铅、镍、砷、镉和汞的重金属平均浓度分别为2.91、29.96、18.24、20.07、7.86、5.0、0.20和0.09mg/kg。镉、铜和汞在湛江湾红树林沉积物中最为突出，而其他金属的污染因子较低。镉显示出高潜在生态风险，其次是汞和铜。采样点，即污水排放口采样点，污染程度最高，其次是污水排放口采样点周边区域。这些受污染的重金属可能来自人为源，包括生活污水和汽车尾气排放。重金属与理化性质之间的相关性分析表明，细颗粒和有机物在控制重金属富集方面起关键作用。
