Black carbon (BC) and total organic carbon (TOC) were quantified in the surface soils of Switzerland (N105) and Delhi (N36), India, to examine their relationships with contents of polycyclic aromatic hydrocarbons (PAH). BC content in Swiss (background) soils (N104) varied from 0.41 to 4.75mg/g (median: 1.13mg/g) and constituted 19% (median: 3%) of TOC. Indian (urban) soils had similar BC concentrations (0.372.05mg/g, median: 1.19mg/g), with relatively higher BC/TOC (623%, median: 13%). Similar to TOC, BC showed significant positive correlation with lighter PAH, but no correlation with heavier PAH in Swiss soils. In contrast, heavier PAH were significantly correlated only with BC in Delhi soils. It seems that TOC governs the distribution of PAH in organic matter rich background soils, while the proximity to emission sources is reflected by BCPAH association in urban soils.
Environmental Pollution – Elsevier
Published: Jan 1, 2011
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