| 陈凌源,何海霞,赵幼琳,何鸿庆,陈双莉,李文斌,邓红艳,任兆刚.非溶解性有机质对沿岸带土壤铜吸附及老化的影响[J].农业环境科学学报,2021,40(8):1696-1706. |
| 非溶解性有机质对沿岸带土壤铜吸附及老化的影响 |
| Influence of non-dissolved organic matter on the adsorption and aging of copper in riverbank soil |
| 投稿时间：2020-11-19 |
| DOI：10.11654/jaes.2020-1341 |
| 中文关键词: 非溶解性有机质 沿岸土壤 铜 吸附量 老化 |
| 英文关键词: non-dissolved organic matter riverbank soil copper adsorption amount aging |
| 基金项目:四川省教育厅项目（18ZB0576）；国家自然科学基金项目（41271244）；西华师范大学基本科研业务费资金（17E057，18B023） |
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| 中文摘要: |
| 河流沿岸带土壤是阻滞径流污染进入河流水体的最后屏障。为了探索川渝地区常见残渣中非溶解性有机质（NDOM）对流域土壤铜吸附及老化的影响，以嘉陵江（川渝段）内广元、南部、南充和合川沿岸土壤为研究对象，分别将空心莲子草、柠檬果渣和污泥NDOM以10%的比例添加到各沿岸土壤中，研究不同环境条件下NDOM改良土壤对铜的等温吸附，并分析铜在不同NDOM改良土壤中老化特征。结果显示：相比于柠檬果渣和空心莲子草，污泥NDOM改良土壤对Cu2+吸附效果更好。不同NDOM改良土壤对Cu2+的吸附能力与土壤阳离子交换量和比表面积成正比。Langmuir模型比Freundlich模型更适宜描述NDOM改良土壤对Cu2+的吸附过程。温度的升高可以促进Cu2+的吸附，且Cu2+吸附过程是一个自发、吸热和熵增的过程。各NDOM改良土壤对Cu2+的吸附量随离子强度的增大先升高后降低（0.1 mol·L-1时最大），而随pH值的升高持续增加。随着老化时间的增加，各NDOM改良沿岸土中的离子交换态和碳酸盐结合态铜含量降低，而铁锰氧化物结合态和有机结合态铜含量升高。相比原始土壤，各NDOM改良土壤中的Cu2+迁移能力整体降低。残渣中NDOM可以增强河流沿岸土壤对Cu2+吸附能力，土壤温度和pH越高，Cu2+老化时间越长，改良土壤对Cu2+的吸附阻滞效果越好。 |
| 英文摘要: |
| Riverbank soil is the last barrier blocking runoff pollution into the river water body. To explore the effect of non-dissolved organic matter(NDOM) on copper adsorption and aging in watershed soils, soils along Guangyuan, Nanbu, Nanchong, and Hechuan from the Jialing River(Sichuan-Chongqing section) were chosen as the research object. Alternanthera philoxeroides, lemon pomace, and sludge NDOM were added to the riverbank soils in a 10% ratio to study the isotherm adsorption of copper(Cu2+) by NDOM-amended soil under different environmental conditions. The aging characteristics of Cu2+ in the different NDOM-amended soil treatments were analyzed. The results showed that:compared with lemon pomace and A. philoxeroides, the sludge NDOM-amended soil exhibited a better adsorption effect on Cu2+. The Cu2+ adsorption amount on different NDOM-amended soil samples was proportional to the cation exchange capacity and specific surface area of the soil. The Langmuir model was better suited to describing the Cu2+ adsorption process on the NDOM-amended soil than the Freundlich model. An increase in temperature promoted Cu2+ adsorption, which is a spontaneous, endothermic, and entropyadding process. The amount of Cu2+ adsorbed by each NDOM-amended soil sample first increased and then decreased with an increase in ionic strength(maximum at 0.1 mol·L-1), and continued to increase with an increase in pH. With the increased aging time, the exchangeable and carbonate form Cu2+ content in the NDOM-amended soil decreased, whereas the iron-manganese oxide bound form and organic bound form Cu2+ content increased. Overall, Cu2+ mobility in each NDOM-amended soil sample was lower than that of the original soil. Sludge NDOM enhanced Cu2+ adsorption in the riverbank soil. The higher the soil temperature and pH, the longer the Cu2+ aging time, and the better the Cu2+ adsorption and blocking effect on the NDOM-amended soil. |
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