Peng Kejian, Luo Chunling, Lou Laiqing, Li Xiangdong, Shen Zhenguo
College of Life Sciences, Nanjing Agricultural University, Nanjing, China.
Sci Total Environ. 2008 Mar 15;392(1):22-9. doi: 10.1016/j.scitotenv.2007.11.032.
The concentrations of heavy metals in the leaves of two aquatic plants Potamogeton pectinatus L. and Potamogeton malaianus Miq., and the corresponding water and sediment samples from the Donghe River in Jishou City of Hunan Province, China were studied to investigate metal contamination from the intensive industrial activities in the surrounding area. Results showed that the concentrations of heavy metals in the sediments, especially Cd, Mn and Pb, were much higher than the eco-toxic threshold values developed by the U. S. Environmental Protection Agency. Between the two plant species, P. pectinatus showed the higher capacity in metal accumulation. The highest concentrations of Cd, Pb, Cu, Zn and Mn were found in the leaves of P. pectinatus, reaching 596, 318, 62.4, 6590 and 16,000 mg kg(-1) (DW), respectively. Significantly positive relationships were observed among the concentrations of Zn, Cu and Mn in the leaves of both aquatic plants and those in water, indicating the potential use of the two plants for pollution monitoring of these metals. In addition, a laboratory experiment was conducted to investigate the ability of P. pectinatus and P. malaianus to remove heavy metals from contaminated river water. The average removal efficiencies by P. pectinatus and P. malaianus for Cd, Pb, Mn, Zn and Cu from the spiked Donghe River water were 92%, 79%, 86%, 67% and 70%, respectively. The results indicated that P. pectinatus and P. malaianus had high capabilities to remove heavy metals directly from the contaminated water. The potential use of these plants in wastewater treatment is worth further exploration.
研究了中国湖南省吉首市峒河两种水生植物龙须眼子菜和竹叶眼子菜叶片中重金属的浓度，以及相应的水样和沉积物样本，以调查周边地区密集工业活动造成的金属污染。结果表明，沉积物中重金属浓度，尤其是镉、锰和铅，远高于美国环境保护局制定的生态毒性阈值。在这两种植物中，龙须眼子菜表现出更高的金属积累能力。龙须眼子菜叶片中镉、铅、铜、锌和锰的最高浓度分别达到596、318、62.4、6590和16000 mg·kg⁻¹（干重）。两种水生植物叶片中锌、铜和锰的浓度与水中的浓度之间均存在显著正相关关系，表明这两种植物在监测这些金属污染方面具有潜在用途。此外，进行了一项实验室实验，以研究龙须眼子菜和竹叶眼子菜从受污染河水中去除重金属的能力。龙须眼子菜和竹叶眼子菜对添加了重金属的峒河水样中镉、铅、锰、锌和铜的平均去除效率分别为92%、79%、86%、67%和70%。结果表明，龙须眼子菜和竹叶眼子菜具有直接从污染水中去除重金属的高能力。这些植物在废水处理中的潜在用途值得进一步探索。
