Nastaran Aghelan; Soheil Sobhan Ardakani; Mehrdad Cheraghi; Bahareh Lorestani
Abstract
Background and Purpose: Phytoremediation is a new technology forremediation of contaminated soils, this study was conducted to evaluationof efficiency of EDTA, citric acid and salicylic acid chelating agents inphytoremediation enhancing of Amaranthus caudatus and Tagetes patula forelimination of Cr(III) ...
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Background and Purpose: Phytoremediation is a new technology forremediation of contaminated soils, this study was conducted to evaluationof efficiency of EDTA, citric acid and salicylic acid chelating agents inphytoremediation enhancing of Amaranthus caudatus and Tagetes patula forelimination of Cr(III) and Cu(II) from contaminated soils in 2018.Material and Methods: After soil pots contaminating by 50 and 100 (mg/kg)K2Cr2O7 and 200 and 400 (mg/kg) CuSO4 salts, and 2.5 (mmol/kg) of EDTAand citric acid (CA) and 2.0 (mmol/kg) of salicylic acid (SA) solution treating,the cultured seedlings were harvested after 60 days. Then, after seedlingsdigestion, Cr and Cu contents were determined using ICP-OESResults: Based on the results obtained, the maximum contents of Cr (mg/kg) in cultivated soil, root and stem samples of A. caudatus were 2.40, 5.18and 1.86 were found in the SA, EDTA and EDTA treatments, respectively andin T. patula with 2.74, 6.00 and 1.30 were found to be in the SA, EDTA andEDTA treatments, respectively. Also, the maximum contents of Cu (mg/kg)in cultivated soil, root and stem samples of A. caudatus with 6.74, 3.77 and3.34 were found to be in the SA, SA and EDTA treatments, respectively andin T. patula with 6.65, 3.45 and 9.50 were found to be in the SA, EDTA andEDTA treatments, respectively. On the other hand, translocation (TF) andbioconcentration (BCF) factors of A. caudatus both were greater than 1 insoils with 100 mg/kg added K2Cr2O7 containing CA, which indicates that thisspecies can be known as hyperaccumulator of CrConclusion: In conclusion, concerning to the considerable role of organic acidsin soil refining electrokinetic and phytoremediation efficiency enhancing,using of these soil amendment agents is recommended to cleanup ofcontaminated soil with heavy metals
Azim Rabiei Mesbah; Soheil Sobhan Ardakani; Mehrdad Cheraghi; Bahareh Lorestani
Abstract
Background and Aim: Polycyclic aromatic hydrocarbons are a large group of ubiquitous environmental pollutants with teratogenic, mutagenic and carcinogenic potential, which are products of incomplete combustion and pyrolysis of fossil fuels and combustion of organic matter. This study was performed to ...
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Background and Aim: Polycyclic aromatic hydrocarbons are a large group of ubiquitous environmental pollutants with teratogenic, mutagenic and carcinogenic potential, which are products of incomplete combustion and pyrolysis of fossil fuels and combustion of organic matter. This study was performed to determine and identify the origin, concentration and source of PAHs compounds in surface soils of industrial areas, Hamedan, Iran, in 2021.Material and Methods: In this descriptive study, 36 surface soil specimens were collected from 12 sampling sites of industrial areas. After extraction of analytes based on the soxhlet method, the gas chromatography/mass spectrometry (GC–MS) method was used for the determination of PAHs compounds in the samples. Molecular diagnostic ratios (MDRs) were used to determine the origin of PAH compounds. Furthermore, the amounts of pH, electrical conductivity (EC) and total organic carbon (TOC) parameters of soil samples were measured. Statistical data processing was performed using SPSS statistics 20 software. Results: The results showed that the total concentrations of 16 identified isomers ranged from 2417 to 16279 µg/kg with a median of 7675 µg/kg and with a dominance of 4-6 rings hydrocarbons (66% of total PAHs). Furthermore fluoranthene (Fla), pyrene (Pyr) and benzo(b)fluoranthene (BbF) were the most abundant compounds in soil and the average of compounds such as benzo(a)anthracene (BaA), benzo(b)fluoranthene (BbF), benzo(a)pyrene (BaP) and dibenzo(a,h)anthracene (DB(ah)A) were higher than MPC established by The Dutch Ministry of Health, Welfare and Sport (MHWS). The results of the MDRs method indicated that both pyrogenic and petrogenic sources are the origin of PAHs in the study area. Conclusion: The result of this study indicates the high impact of anthropogenic activities on the contamination of the study area with PAH compounds. Thus, appropriate soil remediation (especially bioremediation) approaches should be considered.