Singh, D. P. and Gadi, Ranu and Mandal, T. K. (2012) Levels, Sources, and Toxic Potential of Polycyclic Aromatic Hydrocarbons in Urban Soil of Delhi, India. Human and Ecological Risk Assessment , 18 (2). pp. 393-411. ISSN 1080-7039

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Abstract

This study was done to determine the concentration of PAHs in urban soil of Delhi (India). Surface top soil (up to 10 cm depth) samples were collected from four different sampling sites including industrial, roadside, residential, and agricultural areas of Delhi and 16 USEPA priority polycyclic aromatic hydrocarbons (PAHs) were evaluated. Total PAH concentrations at industrial, roadside, residential, and agricultural sites were 11.46 +/- 8.39, 6.96 +/- 4.82, 2.12 +/- 1.12, and 1.55 +/- 1.07 mg/kg (dry weight), respectively, with 3-7 times greater concentrations in industrial and roadside soils than that in residential and agricultural soils. The PAH pattern was dominated by 4- and 5-ring PAHs (contributing > 50% to the total PAHs) at industrial and roadside sites with greater concentration of fluoranthene, chrysene, benzo[b] fluoranthene, benzo[k] fluoranthene, benzo[a] anthracene, benzo[ghi] perylene, and pyrene, whereas, residential and agricultural sites showed a predominance of low molecular weight 2- and 3-ring PAHs (fluoranthene, acenaphthene, naphthalene, chrysene, and anthracene). Isomeric pair ratios suggested biomass combustion and fossil fuel emissions as the main sources of PAHs. The toxic equivalency factors (TEFs) showed that carcinogenic potency (benzo[a] pyrene-equivalent concentration (B[a]P-eq) of PAH load in industrial and roadside soils was similar to 10 and similar to 6 times greater than the agricultural soil.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Taylor & Francis.
Subjects:	Earth Sciences
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	13 Mar 2020 11:09
Last Modified:	13 Mar 2020 11:09
URI:	http://npl.csircentral.net/id/eprint/3522

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