Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China

Abstract

Abstract:The concentrations of Zn, Cr, Cu, As, Cd, and Pb in sediment cores collected from a representative riverine wetland located in the Huaihe River watershed, China, dramaticlly increased from the bottom to upper layer of the cores. Application of principal component analysis (PCA) and enrichment factor (EF) suggested that heavy metals might primarily have been derived from the inflow of contaminated water from an industrial park and agricultural region. Component 1 of the PCA was dominated by Zn, Cr, Cu, Cd, and Pb, while Component 2 was dominated by As. Metals' high concentrations and EF values showed that the anthropogenic pollutants have increased sharply in recent years and reflect the continuous development of industry and agriculture in the region of the wetland, with a corresponding dramatic deterioration of the environment due to constant effluent of pollutants. Cd exerted the highest potential ecological risk of individual metals of sediment cores. Additionally, integrated RI values for all metals indicated that sediments possessed low ecological risk from the bottom to about 6 cm depth of the cores, moderate ecological risk from about 5 cm depth upwards, then considerable ecological risk from 4 cm depth to the top layer of the sediment cores, which demonstrates a continuous deterioration of environmental quality in recent years in this region.

Growth and physiological responses of submerged plantVallisneria natansto water column ammonia nitrogen and sediment copper

“…Given that ammonia-N enrichment in the Huai River varied from 0.02 to 15.43 mg L −1 ( Ren et al, 2015 ) and V. natans cannot survive levels higher than 8 mg L −1 ( Zhu et al, 2015 ), we selected three levels of ammonia-N in this study (0, 3, and 6 mg L −1 ; L N , M N , and H N , respectively). In addition, three levels of Cu in sediment (control and Cu added at levels of 100 and 200 mg kg −1 ; L Cu , M Cu , and H Cu , respectively) were selected based on the finding that the Cu sediment concentration in the polluted Huai River can reach 208.8 mg kg −1 ( Yuan et al, 2015b ). The three levels of ammonia-N content in the water column and three levels of Cu in the sediment produced 9 experimental treatments (L N L Cu , L N M Cu , L N H Cu , M N L Cu , M N M Cu , M N H Cu , H N L Cu , H N M Cu , and H N H Cu ).…”

“…As seen in other polluted freshwater bodies, the ecosystem of the Huai River in China has been severely degraded by excessive pollutant discharge that produced high heavy metal contents, including Cu, and excessive ammonia-N levels in the water column ( Zhang et al, 2010 ; Xia et al, 2011 ; Yuan et al, 2015a ). The Huai River reportedly has ammonia-N concentrations up to 29.70 mg L −1 , and sediment Cu concentrations up to 208.8 mg kg −1 ( Ren et al, 2015 ; Yuan et al, 2015b ). In this study, V. natans , a ubiquitous submerged plant in the Huai River, was selected as the treatment subject.…”

Peer Review #1 of "Growth and physiological responses of submerged plant Vallisneria natans to water column ammonia nitrogen and sediment copper (v0.1)"

“…Manuscript to be reviewed 2014) and V. natans cannot survive levels higher than 8 mg L -1 (Zhu et al, 2014), we selected three levels of ammonia-N in this study (0, 3, and 6 mg L -1 ; L N , M N , and H N , respectively). In addition, three levels of Cu in sediment (control and Cu added at levels of 100 and 200 mg kg -1 ; L Cu , M Cu , and H Cu , respectively) were selected based on the finding that the Cu sediment concentration in the polluted Huai River can reach 208.8 mg kg -1 (Yuan et al, 2015b). The three levels of ammonia-N content in the water column and three levels of Cu in the sediment…”

“…As seen in other polluted freshwater bodies, the ecosystem of the Huai River in China has been severely degraded by excessive pollutant discharge that produced high heavy metal contents, including Cu, and excessive ammonia-N levels in the water column (Zhang et al, 2010;Xia et al, 2011;Yuan et al, 2015a). The Huai River reportedly has ammonia-N concentrations up to 29.70 mg L −1 , and sediment Cu concentrations up to 208.8 mg kg -1 (Ren et al, 2014;Yuan et al, 2015b). In this study, V. natans, a ubiquitous submerged plant in the Huai River, was selected as the treatment subject.…”

Medición del coeficiente de transferencia del oxígeno en aguas residuales

“…La degradación ambiental sobre la calidad de las aguas está condicionando su limitación en diversas regiones del planeta debido a, la persistencia no solo de contaminantes disueltos y/o acumulados (Wang & Zang, 2014;Hezhong et al, 2015), además, en la variabilidad de parámetros físico-químicos y la concentración sobre materia orgánica que en algunos casos ya es irreversible en término de costo ambiental para el manejo del agua (He et al, 2014;Argota, Argota & Iannacone, 2016).…”