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Sorption of atrazine and phenanthrene by organic matter fractions in soil and sediment |
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| Authors: | Ke Sun Bo Gao Guixiang Zhang Baoshan Xing |
| Institution: | a State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China b Department of Plant, Soil, and Insect Sciences, University of Massachusetts, Amherst, MA 01003, USA c Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China |
| Abstract: | Atrazine and phenanthrene (Phen) sorption by nonhydrolyzable carbon (NHC), black carbon (BC), humic acid (HA) and whole sediment and soil samples was examined. Atrazine sorption isotherms were nearly linear. The single-point organic carbon (OC)-normalized distribution coefficients (KOC) of atrazine for the isolated HA1, NHC1 and BC1 from sediment 1 (ST1) were 36, 550, and 1470 times greater than that of ST1, respectively, indicating the importance of sediment organic matter, particularly the condensed fractions (NHC and BC). Similar sorption capacity of atrazine and Phen by NHC but different isotherm nonlinearity indicated different sorption domains due to their different structure and hydrophobicity. The positive relationship between (O + N)/C ratios of NHC and atrazine log KOC at low concentration suggests H-bonding interactions. This study shows that sediment is probably a less effective sorbent for atrazine than Phen, implying that atrazine applied in sediments or soils may be likely to leach into groundwater. |
| Keywords: | Sorption Nonhydrolyzable carbon Black carbon Atrazine Organic matter |
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