| 冯桐桐,杨雯,刘克思,童菊秀,商建英.离子强度和腐植酸对高岭土协同磺胺二甲基嘧啶迁移的影响[J].农业环境科学学报,2017,36(9):1804-1810. |
| 离子强度和腐植酸对高岭土协同磺胺二甲基嘧啶迁移的影响 |
| Effect of ionic strength and humic acid on the collaborative transport of kaolinite and sulfamethazine |
| 投稿时间：2017-03-03 |
| DOI：10.11654/jaes.2017-0273 |
| 中文关键词: 高岭土 磺胺二甲基嘧啶 多孔介质 腐植酸 DLVO理论 |
| 英文关键词: kaolinite sulfamethazine porous media humic acid DLVO theory |
| 基金项目:国家自然科学基金项目（41501232，51209187）；中国农业大学优秀人才项目（2015RC002）；中央高校基本科研业务费专项资金（2652015116） |
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| 中文摘要: |
| 为探讨土壤环境条件对粘土矿物协同磺胺二甲基嘧啶（SM2）迁移的影响，选取高岭土胶体与SM2作为主要实验材料，通过土柱淋溶实验，研究了高岭土与SM2共同迁移的相互影响，不同离子强度下高岭土协同SM2迁移情况以及高离子强度下腐植酸对高岭土协同SM2迁移的影响。研究结果显示：当离子强度为0.1 mmol·L-1时，高岭土悬浊液加入0.25 mg·L-1 SM2后，高岭土胶体的穿透曲线峰值从76%降为70%，表明SM2对高岭土迁移影响很小，略有抑制；SM2悬浊液加入高岭土后，SM2穿透曲线峰值从5.4%增大到50%，表明高岭土可以显著促进SM2的迁移；随着溶液离子强度增强，高岭土的穿透曲线峰值依次为70%（离子强度0.1 mmol·L-1）、27%（1 mmol·L-1）、3%（10 mmol·L-1），SM2的穿透峰值依次为50%（离子强度0.1 mmol·L-1）、48%（1 mmol·L-1）、17%（10 mmol·L-1），表明随着溶液离子强度增强，高岭土迁移量及高岭土协同SM2迁移量显著降低；当溶液离子强度为10 mmol·L-1时，加入8 mg·L-1腐植酸后，高岭土的穿透曲线峰值从3%增长至57%，SM2的穿透曲线峰值从17%增长至50%，表明当溶液离子强度较高时腐植酸可以促进高岭土协同SM2迁移。 |
| 英文摘要: |
| To investigate the effect of soil environmental condition on clay-facilitated sulfamethazine(SM2) transport, kaolinite and SM2 were used as the experimental materials, and column experiments were conducted under different ionic strength(IS) and humic acid(HA) conditions. The results showed that when the IS of the background solution was 0.1 mmol·L-1, the relative concentration of the kaolinite breakthrough curve slightly decreased, from 76% to 70%, after adding SM2 to the suspension. The relative concentration of the SM2 breakthrough curve increased from 5.4% to 50% when a small amount of kaolinite was mixed into the solution. These results show that SM2 slightly inhibited kaolinite mobility in porous media, and kaolinite significantly facilitated the transport of SM2 in porous media. When the IS of the solution increased from 0.1 mmol·L-1 to 10 mmol·L-1, the relative concentrations of kaolinite in the effluents were 70%(0.1 mmol·L-1), 27%(1 mmol·L-1), and 3%(10 mmol·L-1), and the corresponding relative concentrations of SM2 were 50%(0.1 mmol·L-1), 48%(1 mmol·L-1), and 17%(10 mmol·L-1). However, when HA was present in the suspension with high IS(10 mmol·L-1), the relative concentrations of kaolinite and SM2 in the effluents increased from 3% to 57% and 17% to 50%, respectively. These phenomena indicated that facilitated SM2 was reduced as the leaching amount of kaolinite decreased with the IS increasing, and HA enhanced the mobility of kaolinite and facilitated SM2 transport under the condition of high IS. |
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