引用本文:张步迪,林 青,徐绍辉.Cd/Cu/Pb对磺胺嘧啶在土壤中吸附迁移的影响[J].土壤学报,2018,55(5):1120-1130.
ZHANG Budi,LIN Qing,XU Shaohui.Effects of Cd/Cu/Pb on Adsorption and Migration of Sulfadiazine in Soil[J].Acta Pedologica Sinica,2018,55(5):1120-1130
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Cd/Cu/Pb对磺胺嘧啶在土壤中吸附迁移的影响
张步迪,林 青,徐绍辉
青岛大学环境科学与工程学院,青岛大学环境科学与工程学院,青岛大学环境科学与工程学院
摘要:
通过室内批平衡实验和土柱出流实验,探讨了不同浓度镉(Cd)及相同浓度的Cd、铜(Cu)、铅(Pb)对磺胺嘧啶在土壤中吸附、迁移的影响,并分别用Freundlich、Langmuir、Linear方程及Hydrus-1D中的单点和两点吸附模型模拟其在土壤中的吸附、运移过程。结果表明:当Cd浓度为10.0 mg·kg-1时促进磺胺嘧啶的吸附;Cd浓度为1.0、300.0 mg·kg-1时抑制磺胺嘧啶吸附;Cd浓度为100.0 mg·kg-1时对磺胺嘧啶的吸附无影响;300 mg·kg-1的Cd、Cu、Pb存在时,磺胺嘧啶吸附量大小顺序为Cd>Cu>Pb。土柱出流实验中,当Cd浓度为10.0 mg·kg-1时,磺胺嘧啶在土柱中的迁移速度最慢,其他浓度对迁移影响不明显;Cd、Cu、Pb相比较而言,Cu存在时磺胺嘧啶的迁移最快,Cd存在时迁移最慢。在对静态吸附特征的拟合过程中,Linear方程拟合效果最好,决定系数R2均在0.98以上;Hydrus-1D模拟时,两点模型可更好地拟合磺胺嘧啶的运移特征,R2>0.907,均方根误差RMSE<0.051,瞬时吸附f所占分数较高,说明磺胺嘧啶在迁移过程中存在较大程度的瞬时吸附。
关键词:  磺胺嘧啶  重金属  吸附迁移  Hydrus-1D
DOI:10.11766/trxb201712190581
分类号:
基金项目:国家自然科学基金项目(41571214)和山东省自然科学基金青年基金项目(ZR2014DQ021)资助
Effects of Cd/Cu/Pb on Adsorption and Migration of Sulfadiazine in Soil
ZHANG Budi,LIN Qing and XU Shaohui
College of Environment Science DdDd Engineering, Qingdao University,College of Environment Science DdDd Engineering, Qingdao University,College of Environment Science & Engineering, Qingdao University
Abstract:
【Objective】Veterinary antibiotics are extensively used in livestock rearing industries all over the world for preventive and therapeutic treatments and growth promotion of poultry and/or animals. Due to the use of chemical fertilizers and compost, pollution from the industry and/or irrigation with sewage, etc., the content of heavy metals in the soil is getting higher and higher. It is, therefore, often found that the two kinds of pollutants, antibiotics and heavy metals exist simultaneously in the soil, affecting each other in adsorption and migration. Their pollution of the soil has become an environmental issue that can’t be ignored. Therefore, investigation of leaching and adsorption behaviors of these antibiotics and heavy metals in the soil is the first logical step to assess their ecological risks and then develop corresponding pollution control strategies.【Method】 In this research, the soil was exposed to different concentrations of Cd, Cu and Pb. Effects of the pollutants on adsorption and migration of Sulfadiazine (SDZ) in the soil were studied via both batch and column experiments. Adsorption isotherm of SDZ was fitted with Freundlich, Langmuir and Linear models and breakthrough curves of SDZ with the coexisting heavy metals were measured and modeled using numerical models that took into account reversible and irreversible kinetic sorption sites with the aid of the Hydrus-1D software.【Result】No influence of Cd was found on adsorption of Sulfadiazine, when Cd was 100.0 mg·kg-1 in concentration, but it did promote the adsorption of SDZ when 10.0 mg·kg-1 in concentration, and reduce the adsorption of Sulfadiazine, when 1.0 or 300.0 mg·kg-1 in concentration. When Cu, Pb and Cd, all 300.0 mg kg-1 in concentration, coexisted with SDZ, they displayed an order of Cd > Cu > Pb in effect on SDZ adsorption of Sulfadiazine. In the soil column leaching experiment, it was found that Cd, 10.0 mg·kg-1, slowed down the migration of SDZ, while no significant effects were found with Cd higher or lower in concentration. Comparison between the three elements shows that Cu promoted and Cd slowed down the migration of SDZ. The Linear equation was the best in fitting, with R2 being above 0.98. Compared with the OSM model, the TSM model simulated better the migration process of SDZ, with R2 >0.907 and RMSE <0.051. Instantaneous adsorption (f) was found quite high in the process of sulfadiazine migration. 【Conclusion】 Under complex pollution of SDZ and heavy metals, adsorption and migration of SDZ is affected by type and concentration of the heavy metal in the soil. The findings in this study may not only help improve knowledge of the mechanisms of adsorption and transport of SDZ in heavy metal contaminated soils, but also serve as a certain theory basis for management of environmental pollution.
Key words:  Sulfadiazine (SDZ)  Heavy metals  Adsorption and migration  Hydrus-1D