Mohammad Ebrahim Fazel Valipour
Abstract
AbstractBackground and Aim: Heavy metals contamination of soils is one of the main environmental problems. Heavy metals are considered as one most dangerous groups of pollutants because of their toxicity and stability. The biological and ecological importance of heavy metals is due to their characteristics ...
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AbstractBackground and Aim: Heavy metals contamination of soils is one of the main environmental problems. Heavy metals are considered as one most dangerous groups of pollutants because of their toxicity and stability. The biological and ecological importance of heavy metals is due to their characteristics of polluting, their toxicity, persistence and bioaccumulation. The aim of this study was to investigate the spatial distribution of heavy metals in region Dehnow Shandiz (North West of mashhad).Materials and Methods: In the present study, 20 soil samples (10-30 cm depth) collected and total concentration of As, Cd, Co, Cr and Ni were measured using Atomic absorption spectrophotometer device. Also, some other soil properties including PH, Organic carbon, CEC and soil texture proportions were measured.Results: The results showed that the average concentrations of As, Cd, Co, Cr and Ni in the study area were 10.87, 0.26, 14.8, 56.6 and 68.2 mg/kg respectively. Also the results of statistical analysis showed that the standard deviations of As, Cd, Co, Cr and Ni in the study area were 1.97, 0.16, 1.32, 19.47 and 17.39 respectively.Conclusion: The results indicate that the average concentration of Ni in the soil of study area were higher than the standard of the Environmental Protection Organization of Iran and As, Cd, Co and Cr were lower than the standard. The presence of serpentinite soils has increased the concentration of nickel in the region.Document Type: Research article
Javad Momeni Damaneh; Fatemeh Joulaei; Hosein Alidadi; Roya Peiravi
Abstract
Background & objective: Groundwater is one of the exploitation important resources in arid and semi-arid areas. Therefore, the spatial and temporal distribution of groundwater quality is very important. The purpose of this study was to evaluate the accuracy of spatial interpolation methods in order ...
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Background & objective: Groundwater is one of the exploitation important resources in arid and semi-arid areas. Therefore, the spatial and temporal distribution of groundwater quality is very important. The purpose of this study was to evaluate the accuracy of spatial interpolation methods in order to predict the spatial distribution of some groundwater quality parameters such as TH, Ca, pH, Mg and SO4-2. Materials & Methods: in this study data related to 44 exploitation wells in Gonabad plain was used. Then, methods of IDW, SK, OK, UK, RBF, LPI and GPI were investigated. After normalizing the data, QQ plot was drawn. Then, in order to select, an appropriate model for fitting, mutual evaluation methods and estimation errors were used that consisted of MBE, RMSE, MARE and MAPE. Finally, the most appropriate interpolation method was chosen. Zoning maps of the water parameters were prepared by using geostatistical methods in GIS software. Results: Final zoning model showed, in the center, the west south, and the west of plain concentration of surveyed parameters have been lower than their mean. By moving from the north, the east north, and the east towards the center, the south, and the west south, the parameters concentrations were decreased. Conclusion: The results showed that kriging method is preferred to other geostatistical methods for zoning of the water quality parameters