Merck
  • Home
  • Search Results
  • Ecological and human health hazards of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in road dust of Isfahan metropolis, Iran.

Ecological and human health hazards of heavy metals and polycyclic aromatic hydrocarbons (PAHs) in road dust of Isfahan metropolis, Iran.

The Science of the total environment (2014-12-03)
Naghmeh Soltani, Behnam Keshavarzi, Farid Moore, Tahereh Tavakol, Ahmad Reza Lahijanzadeh, Nemat Jaafarzadeh, Maryam Kermani
ABSTRACT

This study investigates trace elements and PAHs content in road dust of Isfahan metropolis, central Iran. The mean concentrations of As, Cd, Cu, Ni, Pb, Sb and Zn are 22.15, 2.14, 182.26, 66.63, 393.33, 6.95 and 707.19 mg kg(-1), respectively. When compared with upper continental crust, the samples generally display elevated trace element concentrations, except for Co and Cr. The decreasing trend of calculated enrichment factors (EFs) is Cd>Pb>Sb>Zn>Cu>As>Ni>Cr>Co. Calculated potential ecological risk reveals that among the analyzed metals, Cd and Pb, have a higher potential ecological risk. Statistically, two identified main sources of trace elements include road traffic emissions and resuspension of soil particles. As, Cd, Cu, Pb, Sb and Zn in Isfahan road dust are strongly influenced by anthropogenic activity, mainly traffic emissions, while Co, Cr and Ni originate from resuspension of soil natural parent particles. The sum of 13 major PAHs (∑13PAHs) mass concentration ranges from 184.64 to 3221.72 μg kg(-1) with the mean being 1074.58 μg kg(-1). PAHs sources are identified using PCA analysis. It is demonstrated that the PAHs in Isfahan road dust are mainly derived from traffic emission, coal combustion and petroleum. Toxic equivalent concentrations (TEQs) of PAHs in the road dust ranges between 25.021 μg kg(-1) and 230.893 μg kg(-1). High correlation coefficients (r(2)=0.909 and 0.822, p<0.01) between Benzo[a]pyrene, Benzo[b+k]fluoranthene and toxicity equivalent concentrations of road dust indicate that Benzo[a]pyrene and Benzo[b+k]fluoranthenes are major TEQ contributors. The total incremental life time cancer risk (ILCR) of exposure to PAHs from Isfahan metropolis urban dust is 4.85 × 10(-4) for adult and 5.02 × 10(-4) for children. Estimated results of ILCR indicate that Isfahan residents are potentially exposed to high cancer risk via both dust ingestion and dermal contact.

MATERIALS
Product Number
Brand
Product Description

Supelco
Dichloromethane, analytical standard
Supelco
Dichloromethane, Selectophore, ≥99.5%
Sigma-Aldrich
Acenaphthene, 99%
Sigma-Aldrich
Hexane, anhydrous, 95%
Sigma-Aldrich
Dichloromethane, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Phenanthrene, 98%
Supelco
Hexane, analytical standard
Sigma-Aldrich
Dichloromethane, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Phenanthrene, sublimed grade, ≥99.5%
Supelco
Dichloromethane solution, certified reference material, 5000 μg/mL in methanol
Supelco
Acenaphthene, analytical standard
Supelco
Phenanthrene, analytical standard, for environmental analysis
Supelco
Dichloromethane solution, certified reference material, 200 μg/mL in methanol
Supelco
Acenaphthene, certified reference material, TraceCERT®
Supelco
Methylene Chloride, Pharmaceutical Secondary Standard; Certified Reference Material
Methylene chloride, European Pharmacopoeia (EP) Reference Standard
Supelco
Phenanthrene, certified reference material, TraceCERT®
Sigma-Aldrich
Hexane, HPLC Plus, for HPLC, GC, and residue analysis, ≥95%
Sigma-Aldrich
Dichloromethane, HPLC Plus, for HPLC, GC, and residue analysis, ≥99.9%, contains 50-150 ppm amylene as stabilizer
Sigma-Aldrich
Hexane, suitable for HPLC, ≥95%
Sigma-Aldrich
Hexane, suitable for HPLC, ≥97.0% (GC)
Sigma-Aldrich
Dichloromethane, suitable for HPLC, ≥99.8%, contains amylene as stabilizer
Sigma-Aldrich
Dichloromethane, biotech. grade, 99.9%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Dichloromethane, puriss. p.a., ACS reagent, reag. ISO, ≥99.9% (GC)
Sigma-Aldrich
Dichloromethane, ACS reagent, ≥99.5%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Hexane, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99% (GC)
Sigma-Aldrich
Dichloromethane, puriss., meets analytical specification of Ph. Eur., NF, ≥99% (GC)
Sigma-Aldrich
Dichloromethane, contains 40-150 ppm amylene as stabilizer, ACS reagent, ≥99.5%
Sigma-Aldrich
Dichloromethane, ACS reagent, ≥99.5%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Hexane, ReagentPlus®, ≥99%