Effect of low molecular weight organic anions on adsorption of aluminum by variable charge soils
文献类型：期刊论文
| 作者 | Xu, RK; Li, JY; Ji, GL |
| 刊名 | Water air and soil pollution
 |
| 出版日期 | 2005-11-01 |
| 卷号 | 168期号:1-4页码:249-265 |
| 关键词 | Acetate A1 adsorption Citrate Oxalate Variable charge soil |
| ISSN号 | 0049-6979 |
| DOI | 10.1007/s11270-005-1775-7 |
| 通讯作者 | Xu, rk(rkxu@issas.ac.cn) |
| 英文摘要 | To examine the effect of organic anions on adsorption of al by variable charge soils at different ph values, the adsorption by three soils in the presence of three low-molecular-weight aliphatic carboxylic acids was investigated. the results showed that the effect depended on ph, the type of organic anions and their concentration. the presence of citrate and oxalate led to an increase in the adsorption of al at low ph and low concentration of organic anions, with citrate showing a stronger effect than oxalate. for example, the maximum increments of al adsorption in the presence of citrate were 131.9, 104.8 and 32.9% in the hyper-rhodic ferralsol, the rhodic ferralsol and the ferric acrisol, respectively, whereas in the presence of oxalate it was 36.1% in the rhodic ferralsol. at high ph or high concentration of organic anions, they showed an inhibiting effect on the adsorption of al. for example, citrate caused the increase in al adsorption by 164.0, 131.0 and 61.0% at ph3.85 and the decrease in al adsorption by 15.2, 19.5 and 45.6% at ph 4.8 for the hyper-rhodic ferralsol, the rhodic ferralsol and the ferric acrisol, respectively. in the citrate and oxalate systems, the adsorption of al increased with the increase in the concentration of organic anions, reaching a maximum values at about 0.4 mmol l-1, and then decreased. when the concentration of organic anions was higher than about 1.0 mmol l-1, both citrate and oxalate inhibited the adsorption of al. the ability of organic anions in increasing the adsorption at low ph and decreasing the adsorption at high ph followed the same order: citrate > oxalate > acetate. the increase of al adsorption at low ph is caused by the increase in soil negative surface charge as a result of the adsorption of organic anions by variable charge soils, while the decrease of al adsorption at high ph and high concentration of organic anions is related to the competition of organic ligands for aluminum ions with soil surface. after the removal of free iron oxides from the soil, al adsorption decreased in the presence of citrate, the anion species most strongly adsorbed by variable charge soils and complexed with aluminum ions. for example, for the rhodic ferralsol and the ferric acrisol, the removal of free iron oxides caused a decrease in the adsorption of al in the presence of citrate at ph4.4 by 26.2 and 21.9%, respectively. |
| WOS关键词 | CARBOXYLIC-ACIDS ; CLAY-MINERALS ; FOREST SOILS ; SURFACE ; KAOLINITE ; SMECTITE ; SORPTION ; DILUTE ; MODEL ; COMPLEXATION |
| WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences ; Water Resources |
| WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000233261800016 |
| 出版者 | SPRINGER |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377207 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Xu, RK |
| 作者单位 | 1.Chinese Acad Sci, Inst Soil Sci, Nanjing, Peoples R China 2.Grad Univ Chinese Acad Sci, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, RK,Li, JY,Ji, GL. Effect of low molecular weight organic anions on adsorption of aluminum by variable charge soils[J]. Water air and soil pollution,2005,168(1-4):249-265. |
| APA | Xu, RK,Li, JY,&Ji, GL.(2005).Effect of low molecular weight organic anions on adsorption of aluminum by variable charge soils.Water air and soil pollution,168(1-4),249-265. |
| MLA | Xu, RK,et al."Effect of low molecular weight organic anions on adsorption of aluminum by variable charge soils".Water air and soil pollution 168.1-4(2005):249-265. |
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来源：中国科学院大学
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