QE57 : Investigation on the contamination of heavy mextals in groundwater resources and soil in Shahrood plain
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2011
Authors:
Abstarct: The present study dealt with the pollution of soil and water resources in Shahrood plain. In this manner, 143 soil samples were taken from different points of the plain from which 71 soil samples were belong to urban area and rest were taken from other points, all undergone ICP-MS analysis. 48 water samples from the water well across the plain were taken to measure cations and anions concentration and ICP-MS tests were performed in order to assess elements and heavy mextals concentrations. Among all detected elements and heavy mextals, baxsed on the environmental priorities and their concentrations as well as variation in their concentrations in soil and water, Cu, Zn, Pb, Sr, V, Cr, and P were selected for further studies. The geological studies on the region showed that northern areas of the plain are more Alborz Jurassic calcareous formations (Delichay and Lar) as well as Shemshak shale and sandstones while the southern areas are mostly evaporative-terrigenous (shale and gypsum marl) formations similar to Qom and Ghermez formations. The soil quality study on the plain showed that the concentration of strontium elevated remarkably in southern gypsum and salty units as well as in northern calcareous units. Concentrations of lead, zinc, chromium, and phosphorus in the soil of the landfill area showed a considerable increase that indicates an anthropogenic pollution. The soil of the landfill and the exit of the basin showed a low value of modified contamination degree and the rest of the plain did not show an indication of pollution. The values of enrichment factor, geoaccumulation index, and contamination factor in the regions were under the influence of anthropologic activities (landfill, urbanization, and industrial region, …) showed increase with regards to the other regions.The results of test on the water resources showed that carbonate, sulfate, chloride, calcium, sodium, magnesium, strontium, and electrical conductivity in the stations in vicinity of gypsum-salt units in northeast and southwest were higher than in the rest of the samples. Increment in the concentration of nitrate in the groundwater in the city of Shahrood and industrial region are indications of effects of urbanization and industrialization on the nitrate concentration in groundwater. The general trend of variation in water type is changed from carbonate-calcite in the upper side of the basin to chloride-sodic in the exit. The comparison of concentrations of elements with WHO 2008 drinking water standard showed that many water samples from the southwest of the study area were not drinkable with regards to the concentration of sodium, calcium, and chloride. In general, the concentrations of heavy mextals in water samples were very low and all water resources were of good quality with respect to heavy mextals. The saturation index showed that water samples from the exit area were near saturated by gypsum and indurate. The mextal index (MI) in all water samples were below one.
Keywords:
#soil #water #heavy mextals #pollution #Shahrood plain Link
Keeping place: Central Library of Shahrood University
Visitor:
Keeping place: Central Library of Shahrood University
Visitor: