Xia Yuanfen, Liu Jiayuan, Yang Xuechun, Ling Xiaofeng, Fang Yan, Xu Zhen, Liu Fude
State Power Environmental Protection Research Institute, Nanjing 210031, China.
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China.
Toxics. 2024 Nov 22;12(12):839. doi: 10.3390/toxics12120839.
The distribution of trace metals (TMs) in a continuous water body often exhibits watershed attributes, but the tidal gates of the coastal rivers may alter their transformation and accumulation patterns. Therefore, a tidal gate-controlled coastal river was selected to test the distribution and accumulation risks of Al, As, Cr, Cu, Fe, Mn, Ni, Sr, and Zn in the catchment area (CA), estuarine area (EA), and offshore area (OA). Associations between TMs and bacterial communities were analyzed to assess the feasibility of using bacterial parameters as ecological indicators. The results showed that As and Cr were the key pollutants due to the higher enrichment factor and geoaccumulation index, reaching slight to moderate pollution levels. The Nemero index was highest in EAs (14.93), indicating a higher pollution risk in sediments near tide gates. Although the TM dynamics can be explained by the metal-indicating effects of Fe and Mn, they have no linear relationships with toxic metals. Interestingly, the metabolic abundance of bacterial communities showed good correlations with different TMs in the sediment. These results highlight bacterial community characteristics as effective biomarkers for assessing TM pollution and practical tools for managing pollution control in coastal environment.
连续水体中痕量金属（TMs）的分布通常呈现流域属性，但沿海河流的潮汐闸可能会改变其转化和积累模式。因此，选取了一个受潮汐闸控制的沿海河流，以测试集水区（CA）、河口区（EA）和近海区域（OA）中铝、砷、铬、铜、铁、锰、镍、锶和锌的分布及积累风险。分析了痕量金属与细菌群落之间的关联，以评估将细菌参数用作生态指标的可行性。结果表明，由于富集因子和地积累指数较高，砷和铬是关键污染物，达到了轻度至中度污染水平。内梅罗指数在河口区最高（14.93），表明潮汐闸附近沉积物中的污染风险较高。虽然痕量金属的动态变化可以通过铁和锰的金属指示作用来解释，但它们与有毒金属没有线性关系。有趣的是，细菌群落的代谢丰度与沉积物中不同的痕量金属显示出良好的相关性。这些结果突出了细菌群落特征作为评估痕量金属污染的有效生物标志物以及沿海环境污染控制管理实用工具的作用。
