Akram Ghorbani; Mohammad javad Alipoor; Mohammad Ghafoori
Abstract
Background and Purpose: Distribution of heavy metals in all types of sediments is one of the important and new topics in environmental sedimentology. This study was conducted with the aim of investigating the amount of factor pollution, concentration of cadmium and lead metals, geochemical accumulation ...
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Background and Purpose: Distribution of heavy metals in all types of sediments is one of the important and new topics in environmental sedimentology. This study was conducted with the aim of investigating the amount of factor pollution, concentration of cadmium and lead metals, geochemical accumulation index and ecological risk category in the soil downstream of Taibad Landfill.materials and methods: 15 stations were selected at a distance of 100 meters from each other and along the waterway exiting the site from a distance of 100 to 1500 meters. After sampling 5 samples and repeating 3 times from each station, the samples were taken to the laboratory for analysis.Results: In stations 2 and 6, because the pollution factors (CF) are between 1 and 3, the level of pollution in these stations is average, in station 10 it is very high, and for the rest of the stations, because the pollution factors are between 3 and 6, the level of pollution is high. For cadmium metal, the pollution factor (CF) in all stations is between 3 and 6 and the pollution is high. Based on the results, the amount of lead and cadmium metals in the risk category They are ecologically average.Conclusion: The amount of lead metal pollution in station 2 and 6 is moderate, station 3 is very high and in other stations it is high. Cadmium metal contamination was reported in all stations. Both metals are in the medium category in terms of ecological risk.The concentration mentioned metals in the soil downstream of the landfill is significantly higher than the global soil average and the earth's crust. It seems that this pollution is caused by the landfill, which was spread to the downstream lands by seasonal runoff
Mohsen Mohammadi; Ali Akbar Hedayati; Mohammad Forouhar Vajargah; Ahmad Reza Pirali; Maryam Fallah
Abstract
Background and Aim: Sediment monitoring in aquatic environments is very important due to long-term exposure of various pollutants. This study was conducted to monitor the pollution of some heavy metals (Cd, Cu, Fe, Pb and Zn) in the surface sediments of Anzali wetland.Materials and Methods: For this ...
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Background and Aim: Sediment monitoring in aquatic environments is very important due to long-term exposure of various pollutants. This study was conducted to monitor the pollution of some heavy metals (Cd, Cu, Fe, Pb and Zn) in the surface sediments of Anzali wetland.Materials and Methods: For this purpose, sediment samples were collected from east, west and central parts of the wetland in different seasons of 2020. Heavy metals contamination zoning for sediments in the study area was performed using Arc GIS 10.7Results: The results showed that the highest level of contaminants were obtained in the western part of the wetland. The average concentrations of heavy metals in the sediments were related to Cu (18.47), Zn (74.15), Cd (0.67), Pb (12.05) and Fe (1.97) mg. kg-1 in the western part. The pattern of changes of studied metals was in conformity with Cd 0.05) between Pb, Cu and Zn. According to the zoning map of the parts located in the middle of the center to the west of the wetland, higher amounts of metals have been deposited in its sediments.Conclusion: In general, various human activities and the development of industries and the existence of agricultural lands in the area of Anzali Wetland and incoming rivers can be considered as factors affecting pollution. Therefore, with continuous biological and ecological monitoring of the wetland, it is possible to estimate the amount of heavy metals and the share of each in the wetland. Also, management in order to protect and monitor the wetland seems necessary.
Fahimeh Ranjbar; Hojjat Allah Jafarian; Mohammad Gholizadeh; Mohammad Harsij
Abstract
Background and Objective: In recent years, the construction of fish farms on the margins of the Mohammadabad Katoul River has increased significantly. The purpose of this study was to investigate the effects of the effluents of these fields on some of the river water quality factors. Materials and Methods: ...
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Background and Objective: In recent years, the construction of fish farms on the margins of the Mohammadabad Katoul River has increased significantly. The purpose of this study was to investigate the effects of the effluents of these fields on some of the river water quality factors. Materials and Methods: In this study, five sampling stations of 3 rainbow trout ponds were selected for seasonal water sampling in 1396 seasonally with 3 replications, 12 water quality parameters including dissolved oxygen, fecal coliform, pH, biochemical oxygen demand, chemical oxygen demand, temperature, organic phosphate, nitrate, ammonium, turbidity, total dissolved solids and electrical conductivity. Then, fixed effects of data were analyzed using significant test and water quality was evaluated according to IRWQISC. Results: The results show that the water of Mohammadabad Katoul basin is of medium to relatively good quality. The best water quality in autumn with numerical value of 70.5 and the worst water quality in summer with numerical value of 43.3. The reasons for the relatively poor water quality in summer can be attributed to the high activity of the effluent from the fish ponds, such as reduced river discharge, as well as increased recreational activities in the river, agricultural effluents, rural wastewater discharge, and high livestock density. Area noted. Conclusion: In all seasons, water quality was higher than that of other stations during station 1 sampling prior to fish farming. According to the obtained index, it can be generally concluded that river water quality is suitable due to aquaculture activities.
Mojgan Mirzaei; Eisa solgi
Abstract
Background and objective: Emission of pollutants caused by natural and human activities on the environment is one of the most important issues in today's society. Objective: This study was based on laboratory studies, field and review of the literature. The aim of this study to determine the concentration ...
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Background and objective: Emission of pollutants caused by natural and human activities on the environment is one of the most important issues in today's society. Objective: This study was based on laboratory studies, field and review of the literature. The aim of this study to determine the concentration of heavy metals (cadmium, copper, manganese, nickel, lead and zinc) in the sediment of Zayandehrood river sediments and comparing them at different stations and various seasons from early October 2014 until late September 2015. Materials & Methods: ICP-AES techniques were used to determine the concentrations of heavy metals by atomic absorption spectrophotometer and then the emissions of metals evaluated with statistical software and Mueller indicator. Zayanderood basin is located in 50° 2´ to 53° 24´ east longitude and 31° 12´ to 33° 42´ north latitude. Results: The results showed high levels of cadmium concentration in Vahid Bridge station in the summer with the amount of 0.0081 ± 0.95, milligrams per kilogram of dry weight that is higher than Canada and New York sediment quality standard. Conclusion:The results showed high levels of cadmium and further concentration of global standards for electroplating industry and agricultural activities in upstream stations. High levels of manganese and lead in Chum Bridge and Varzaneh are related to agricultural activities mainly. Generally, Vahid Bridge station has more unsuitable situation than the other stations.