title: Sorption of pyrene on two paddy soils and their particle-size fractions.
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( < 2 microm) and coarse sand fraction(2000-250 microm) had higher sorption capacity than fine sand fraction(250-20 microm) and silt fraction(20-2 microm). The log Koc values obtained of each soil and its particle-size fractions were similar, proving that SOM content was a key factor affecting pyrene sorption. The Kd 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.
authors.affiliation: Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Jiu-hai
authors.initials: JH
authors.lastname: Li
authors.forename: Gen-xing
authors.initials: GX
authors.lastname: Pan
mesh_terms: D000327:Adsorption; D000383:Agriculture; D000538:Aluminum Silicates / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D000077215:Clay; D007700:Kinetics; D011721:Pyrenes / Q000737:chemistry*; D012822:Silicon Dioxide / Q000032:analysis; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants
chemical_list: D000538:Aluminum Silicates; D011721:Pyrenes; D012987:Soil; D012989:Soil Pollutants; D012822:Silicon Dioxide; C030984:pyrene; D000077215:Clay