soroush namjoofar; Ahmad Nohegar; Zeinab Sazvar
Abstract
Horul Azim Wetland is located in the southwestern Iran in Khuzestan Province, has 1180 km2. About 70% of the wetland is located in Iraq, which has faced the challenges of drought and oil drilling, and many of its southern lands have dried up and become dust center. The present study was conducted with ...
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Horul Azim Wetland is located in the southwestern Iran in Khuzestan Province, has 1180 km2. About 70% of the wetland is located in Iraq, which has faced the challenges of drought and oil drilling, and many of its southern lands have dried up and become dust center. The present study was conducted with the aim of assessing the levels of heavy metal pollution in the dried part of this wetland. At first, 15 stations were identified on the LANDSAT image and the dried soil of the wetland was sampled by quadrat and the Cd, Cu, Pb, Fe, Mn and Ni were measured by ICP-MS device. To assess the pollution levels, Igeo, ER, PLI, RI, CSI and mCd were used. The results showed that the concentration of Cd, Cu, Ni and Pb is higher than the shale standard. According to the Igeo, Cd pollution is high (moderate to severe). According to the PI, Cd and Pb pollution are high and moderate, respectively. The ER shows that the ecological pollution of Cd is significant, but other metals don't have ecological risk. The average of the cumulative indices ER and PLI were 193 and 9.7, respectively, indicating a possible ecological risk for all points. The CSI pollution safety for Cd, Cu, Ni and Pb was 0.52, 0.25, 4.02 and 0.34, and the mCd index was 0.27, 10.4, 13.9 and 8.9, respectively, indicating a very high severity of pollution safety for Ni and Cd.
Esfandiar Jahantab; Ali Najmeddin
Abstract
Heavy metal pollution is one of the most serious environmental problems that is spreading around the world. The purpose of this study was to determine the rate of pollution and enrichment of heavy metals inside and around the industrial town of Shiraz. For this aim, 20 surface soil samples were gathered ...
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Heavy metal pollution is one of the most serious environmental problems that is spreading around the world. The purpose of this study was to determine the rate of pollution and enrichment of heavy metals inside and around the industrial town of Shiraz. For this aim, 20 surface soil samples were gathered from a depth of 0 to 15 cm from inside and around Shiraz industrial town, and the concentrations of Pb, Cr, Al, Mn, Cu, Zn, St, V, N, Co, Sc, Fe As was evaluated using the ICP-method MS. The results showed that the average concentrations of Cu, Pb, Mn, Cr, Al, Zn, St, V, Ni, Co, Fe, As and Sc are 75, 87.9, 541.6, 143.3, 21804.8, 275.4, 439.9, 173.3, 55.4, 12.0, 50579.3, 4.8, and 4.7 mg / kg, respectively. The results showed that the average concentration of all elements except Al (21804.8 mg/kg) and Sc (4.7 mg/kg) is much higher than the concentration of these elements in global soils. In addition, Cu, Pb, Zn, V and Cr show much higher concentrations than standard Chinese and Canadian standards. Calculation of the enrichment coefficient of the mentioned elements in soil samples indicates high enrichment of Cu (8.32), Pb (5.42), Zn (7.04), St (5.15), V (5.04), and Cr (5.34). The results of the present study indicate that the soils of the region are contaminated with Cu, Pb, V, Mn and Zn. Therefore, it is suggested to reduce metals in the environment by different methods.
reza hamed moghadam salari; Abbas Ali Ghezelsofloo; milad Iranshahy
Abstract
The purpose of this study is to investigate the potential of some plants for Phytoremediation of soil contaminated with lead, zinc, cadmium and copper. To do this, four plant species of Achillea millefolium, Agropyron elongatum, Bouteloua dactyloides and Artemisia sieberi were cultivated and plant samples ...
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The purpose of this study is to investigate the potential of some plants for Phytoremediation of soil contaminated with lead, zinc, cadmium and copper. To do this, four plant species of Achillea millefolium, Agropyron elongatum, Bouteloua dactyloides and Artemisia sieberi were cultivated and plant samples were irrigated with refinery wastewater. The results showed that in terms of plants, Bouteloua dactyloides, Artemisia sieberi and Achillea millefolium are good transfer of metals to their aerial parts which is suitable for plant extraction (the most important technique of Phytoremediation). Agropyron elongatum mostly accumulates copper and lead metals in the root. This is a proper feature of phytostabilization. Also the capability of these four plants species for Phytoremediation is as follows: Bouteloua dactyloides> of Achillea millefolium> Artemisia sieberi = Agropyron elongatum. Bouteloua dactyloides is proper for Phytoremediation of all heavy metals. For Bouteloua dactyloides, plant transfer factor (TF) in metals: zinc, copper, lead and cadmium is 1.17 and 1.9, 1.12 and 1.41, respectively, and bio concentration factor (BCF) for that in these metals are 1.77 and 1.22, 0.95 and 1.37, respectively. Since Bouteloua dactyloides has high tolerance to drought and high temperatures and is also suitable for lawn making, it is suggested that this type of species is used for Phytoremediation of soils contaminated with heavy metals in polluted areas as well as lawn making so that in addition to soil cleansing from heavy metals and being proper with native climates in many parts of Iran and having low irrigation requirements.
