...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Effect of low-molecular-weight organic acids on the distribution of mobilized Al between soil solution and solid phase
【24h】

Effect of low-molecular-weight organic acids on the distribution of mobilized Al between soil solution and solid phase

机译：低分子量有机酸对土壤溶液与固相之间动员态铝分布的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Low-molecular-weight (LMW) organic acids occur widely in soils. Results in pure mineral systems and podzols suggest that LMW organic acids can promote the dissolution of Al from kaolinite, Al oxides and soils, but limited information is available concerning the role of these organic acids on Al mobilization in variable charge soils as yet. This paper deals with the effect of LMW organic acids on Al mobilization and mobilized Al distributed between the solution phase and exchangeable sites in two acidic variable charge soils. The results indicated that LMW organic acids accelerated Al mobilization through proton- and ligand- promoted reactions. The ability of different organic acids to mobilize Al followed the order: citric acid > oxalic acid > malonic acid > malic acid > tartaric acid > salicylic acid > lactic acid > maleic acid. This order was in general agreement with the magnitude of the stability constants of Al-organic acid complexes. The ratio of soluble Al to exchangeable Al also increased as the stability constants increased. These results showed that the organic acids with strong Al-complexation capacity were most effective in Al mobilization, whereas the weak organic acids promoted the retention of mobilized Al by the soil exchangeable sites. Increase in both organic acid concentration and solution pH promoted Al mobilization and also increased the ratio of soluble Al to exchangeable Al due to the increase in the concentration of the effective organic ligands, especially in the strong organic acid systems. These findings may have their practical significance for establishing more effective amelioration procedures for variable charge soils with increased acidity and higher mobility of Al. (c) 2006 Elsevier Ltd. All rights reserved.
机译：低分子量（LMW）有机酸广泛存在于土壤中。纯矿物系统和Podzols的结果表明LMW有机酸可以促进Al从高岭石，Al氧化物和土壤中的溶解，但是关于这些有机酸在可变电荷土壤中对Al迁移的作用的信息尚有限。本文研究了LMW有机酸对铝动员的影响，以及在两种酸性可变电荷土壤中固溶Al分布在固溶相和可交换位之间的作用。结果表明，LMW有机酸通过质子和配体促进的反应加速了Al的迁移。不同的有机酸迁移铝的能力依次为：柠檬酸>草酸>丙二酸>苹果酸>酒石酸>水杨酸>乳酸>马来酸。该顺序总体上与Al-有机酸络合物的稳定常数的大小一致。可溶性铝与可交换铝的比例也随着稳定性常数的增加而增加。这些结果表明，具有很强的铝络合能力的有机酸对铝的迁移最有效，而弱的有机酸则促进了土壤可交换部位对迁移的铝的保留。有机酸浓度和溶液pH值的增加都促进了Al的迁移，并且由于有效有机配体的浓度增加而增加了可溶性Al与可交换Al的比例，特别是在强有机酸体系中。这些发现对于为酸度增加和铝迁移率更高的可变电荷土壤建立更有效的改良程序可能具有实际意义。 （c）2006 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号