Sorption of pyrene on two paddy soils and their particle-size fractions

Article type: Research Article

Authors: LI, Jiu-hai | PAN, Gen-xing

Affiliations: Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China

Note: [] Corresponding author. E-mail: [email protected]

Abstract: In the present study, the sorption of pyrene on two kinds of bulk paddy soils, Gleyic Stagnic Anthrosols, and Ferric accumulic Stagnic Anthrosols as well as their particle-size fractions was investigated. The sorption isotherms fitted well with Freundlich equation. For both soils, the clay fraction (<2μm) and coarse sand fraction (2000–250μm) had higher sorption capacity than fine sand fraction (250–20μm) and silt fraction (20–2μm). The logK_{oc} values obtained of each soil and its particle-size fractions were similar, proving that SOM content was a key factor affecting pyrene sorption. The Km_d values showed a significant correlation with contents of dithionite-extractable Fe in both paddy soils and a good relationship with CEC in Gleyic Stagnic Anthrosols, indicating possible effects of surface properties of particle-size fractions on the sorption of pyrene.

Keywords: paddy soil, particle-size fraction, PAHs, sorption

Journal: Journal of Environmental Sciences, vol. 17, no. 6, pp. 962-965, 2005