Assessment of As, Cd, Zn, Cu and Pb Pollution and Toxicity in River Wetland Sediments and Artificial Wetland Soils Affec
- PDF / 1,068,467 Bytes
- 11 Pages / 595.276 x 790.866 pts Page_size
- 67 Downloads / 202 Views
DEGRADATION AND ECOLOGICAL RESTORATION OF ESTUARINE WETLANDS IN CHINA
Assessment of As, Cd, Zn, Cu and Pb Pollution and Toxicity in River Wetland Sediments and Artificial Wetland Soils Affected by Urbanization in a Chinese Delta Chongyu Yan 1 & Tao Zhuang 2 & Junhong Bai 1
&
Xiaojun Wen 1 & Qiongqiong Lu 1 & Ling Zhang 1
Received: 6 March 2020 / Accepted: 16 June 2020 # Society of Wetland Scientists 2020
Abstract The concentrations of As, Cd, Zn, Cu and Pb were analyzed to assess their pollution levels and toxic risks in different wetlands affected by urbanization. The results showed that As and heavy metals (especially Cd) showed higher concentrations in urban and rural river wetland sediments compared with artificial wetland soils. Comparatively, urban river wetland sediments contained higher Cu, Pb and Zn and lower As and Cd levels than rural river wetland sediments and artificial wetland soils. Cu, Pb, Zn, soil/sediment organic matter (SOM) and total phosphorous (TP) were all positively correlated with each other. The highest geoaccumulation indexes and pollution levels were observed in urban river wetlands, followed by rural river wetlands, while artificial wetlands showed the lowest values. In urban and rural river wetlands, the enrichment factor (EF) values for As and heavy metals exceeded 1.5, implying that they might be mostly from anthropogenic sources. In artificial wetlands, the EF values suggested that only Cd was mainly from anthropogenic sources. The sum of toxic units (ΣTUs) values showed that As and heavy metals in both river wetland sediments had moderate toxic risks with ΣTUs values exceeding 4, while a low toxicity risk was observed in artificial wetland soils. Keywords Wetland sediments . Heavy metals . Geoaccumulation index . Enrichment factor . Toxic risks
Introduction Wetlands are an ecosystem with the richest biodiversity (Jia et al. 2003) and play an irreplaceable role in cherishing species resources, maintaining biodiversity and regional ecological balance (Quan 2017;Wang et al. 2019). Wetland sediments/ soils serve as sinks, sources and transfers of heavy metals (Lu et al. 2016; Zhang et al. 2017; Yong et al. 2019). Heavy metals have potential ecological risks to wetland ecosystems due to their persistence, toxicity and bioaccumulation in the wetland
* Tao Zhuang [email protected] * Junhong Bai [email protected] 1
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, People’s Republic of China
2
Jinan Environmental Research Academy, Jinan 250102, People’s Republic of China
sediments/soils (Li et al. 2016; Ke et al. 2017). For the persistent toxicity and difficulty in biodegradation, heavy metals may do directly or indirectly harm to human health and ecosystem stability through food chains (Dong et al. 2010; Satarug et al. 2010; Wu et al. 2010b). Therefore, it is of great significance to investigate heavy metals in wetland sediments/ soils in order to better understand their impacts on the structures and functions
Data Loading...
