title: Properties of biochar-amended soils and their sorption of imidacloprid, isoproturon, and atrazine.
abstract: Biochars produced from rice straw, wheat straw and swine manure at 300, 450 and 600°C were added to soil at 1, 5, 10, or 20% levels to determine whether they would predictably reduce the pore water concentration of imidacloprid, isoproturon, and atrazine. The sorption capacity of the mixtures increased with increasing biochar amounts. The enhanced sorption capacity could be attributed to the increased organic carbon (OC) content and surface area (SA) as well as the decreased hydrophobicity. Biochar dominated the overall sorption when its content was above 5%. The OC contents of the mixtures with 10% and 20% biochar were generally lower than the predicted values. This implies possible interaction between soil components and biochar and/or the effect of biochar oxidation. For soils amended with biochars produced at 300°C, the N2 SA (N2-SA) values were underestimated. The predicted CO2 SA (CO2-SA) values of the mixtures at the biochar content of 10% and 20% were generally higher than the experimental values. Sorption of imidacloprid to the soils amended with biochar at 10% and 20% levels, excluding the soils amended with rice (SR300) and wheat (SW300) straw-derived biochar produced at 300°C, was lower than the predicted value. For SR300 and SW300, the intrinsic sorption capacity of biochar was enhanced by 1.3-5.6 times, depending on the biochar, solute concentration, and biochar dose. This study indicates that biochars would be helpful to stabilize the soil contaminated with imidacloprid, isoproturon, and atrazine, but the sorption capacity of the mixtures could exceed or fall short of predicted values without assuming a cross-effect between soil and biochar.
authors: State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA.
authors: Jie
authors: J
authors: Jin
authors: State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
authors: Mingjie
authors: M
authors: Kang
authors: State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China. Electronic address: sunke@bnu.edu.cn.
authors: Ke
authors: K
authors: Sun
authors: State Key Laboratory of Water Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
authors: Zezhen
authors: Z
authors: Pan
authors: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
authors: Fengchang
authors: F
authors: Wu
authors: Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, USA.
authors: Baoshan
authors: B
authors: Xing
mesh_terms: D001280:Atrazine / Q000032:analysis; D002606:Charcoal / Q000737:chemistry*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D007093:Imidazoles / Q000032:analysis; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000032:analysis; D010671:Phenylurea Compounds / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis
chemical_list: D006540:Herbicides; D007093:Imidazoles; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010671:Phenylurea Compounds; D012987:Soil; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; C082359:imidacloprid; C028904:isoproturon; D001280:Atrazine
keywords: Biochar; Herbicides; Insecticides; Pesticides; Soil; Sorption