Effect of low-molecular-weight organic anions on exchangeable aluminum capacity of variable charge soils
文献类型：期刊论文
| 作者 | Li, JY; Xu, RK; Xiao, SC; Ji, GL |
| 刊名 | Journal of colloid and interface science
 |
| 出版日期 | 2005-04-15 |
| 卷号 | 284期号:2页码:393-399 |
| 关键词 | Organic anions Exchangeable al Variable-charge soil |
| ISSN号 | 0021-9797 |
| DOI | 10.1016/j.jcis.2004.10.051 |
| 通讯作者 | Xu, rk() |
| 英文摘要 | Low-molecular-weight (lmw) organic acids exist widely in soils and have been implicated in many soil processes, such as nutrient availability, translocation of metals, fate of heavy metals, and mineral weathering. in this paper, the effect of the lmw organic anions on the exchangeable aluminum of two variable-charge soils was examined. the results showed that the organic anions induced an increase or a decrease in the exchangeable al, and the extent and direction of the effect depended on the nature of organic anions, surface chemical properties of soils, and ph. for example, at ph 4.5, the quantity of exchangeable al of oxisol in the control system was 2.65 mmol kg(-1), whereas the values in the citrate, oxalate, malonate, malate, tartarate, salicylate, and lactate systems increased by 3.25, 1.93, 1.95, 1.82, 1.28, 0.88, and 0.45 times, respectively. lit contrast, the quantity of the exchangeable al of ultisol at ph 4.5 in the oxalate and the citrate systems decreased by 8.8 and 19.6%, respectively. the increase in the exchangeable al was caused mainly by the increase in negative surface charge of the soils due to the specific adsorption of organic anions. the ability of organic anions at low concentrations to increase exchangeable al for oxisol followed the order citrate > oxalate and malonate > malate > tartarate > salicylate > maleate > lactate. this order is consistent with that of the effect of the adsorption of anions on the increase in the negative surface charge and/or the decrease in the positive surface charge of the soil. on the other hand, the organic anions could depress the exchangeable al through the formation of soluble al-organic anion complexes under certain conditions. the anions with small stability constants of al-organic anion complexes, such as lactate, caused an increase in exchangeable al with the change in surface charge of the soils, while those with large stability constants, such as citrate and oxalate, caused an increase in the exchangeable al at low concentration and a decrease at high concentration. (c) 2004 elsevier inc. all rights reserved. |
| WOS关键词 | ACIDS ; RHIZOSPHERE ; ADSORPTION ; SORPTION |
| WOS研究方向 | Chemistry |
| WOS类目 | Chemistry, Physical |
| 语种 | 英语 |
| WOS记录号 | WOS:000228025400004 |
| 出版者 | ACADEMIC PRESS INC ELSEVIER SCIENCE |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2378198 |
| 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.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, JY,Xu, RK,Xiao, SC,et al. Effect of low-molecular-weight organic anions on exchangeable aluminum capacity of variable charge soils[J]. Journal of colloid and interface science,2005,284(2):393-399. |
| APA | Li, JY,Xu, RK,Xiao, SC,&Ji, GL.(2005).Effect of low-molecular-weight organic anions on exchangeable aluminum capacity of variable charge soils.Journal of colloid and interface science,284(2),393-399. |
| MLA | Li, JY,et al."Effect of low-molecular-weight organic anions on exchangeable aluminum capacity of variable charge soils".Journal of colloid and interface science 284.2(2005):393-399. |
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来源：中国科学院大学
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