Evaluation of heavy metal (Zn, Cu, and Cd) contamination in the organs of wetlands Phragmites Australis and Typha Angustifolia in Anzali wetland
Subject Areas :Farzin Sayyad Ghorbani Shirin 1
1 - دانش آموخته کارشناسی ارشد زمین شناسی زیست محیطی، دانشگاه آزاد اسلامی واحد لاهیجان
Keywords: Anzali Wetland, Phragmites Australis, Typha angustifolia, vegetation monitoring, heavy metal contamination,
Abstract :
Heavy metals are among the most important environmental pollutants that enter the sea through coastal areas and rivers and accumulate through the food chain in aquatic organisms (Ebadi et al., 2005). These elements enter the environment as a result of natural and human factors, especially industrial, agricultural and urban wastewater, and accumulate through aquatic food through chain food (Ismaili et al., 2009). Industrial activities increase the burden of heavy metals in the rivers. Aquatic plants have a high ability to measure heavy metals through the process of absorption and accumulation in their tissues due to deposition in the aquatic environment and nutrition from the bed. In this research, we measured the concentration of three heavy metals, Zn, Cu and Cd in sediment samples of wetlands and tissues of wetland Phragmites Australis and Typha angustifolia in Enzily Aziz wetland. For this purpose, three sampling stations were selected in the western part of the wetland and sampled in July 1397. From each station, 1 standard sediment sample was collected with standard van Wang standard and one sample of Phragmites Australis and Typha angustifolia was randomly harvested. Samples in the laboratory after drying and powdering were analyzed by acid digestion method and based on ASTM 2000 standard. The results of this study indicate that the average amount of zinc element in Phragmites Australis tissue from 3 stations was 2266.8 ppm, the average copper element was 8.7 ppm and the average element of cadmium was about 198. ppm. The average amount of zinc element in the tissue of Typha angustifolia was between 3 stations sampled at 315.6 ppm, the average element of copper was 10.66 ppm, and the average element of cadmium was about 49 ppm is. The concentration of zinc in the bedding of the wetland was about 26234 ppm, the concentration of Cozum element was about 22.2 ppm and cadmium was about 1.14 ppm. Evidence suggests increased zinc concentrations compared to other heavy metals found in the root tissues of Phragmites Australis and Typha angustifolia.
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