当前位置: 首页 > 文章 > 低分子量有机酸对两种可变电荷土壤吸附铜的影响 农业环境科学学报 2004,23 (02) 97-100
Position: Home > Articles > Effect of Low Molecular Weight Organic Carboxylic Acids on Adsorption of Copper by Variable Charge Soils Journal of Agro-Environment Science 2004,23 (02) 97-100

低分子量有机酸对两种可变电荷土壤吸附铜的影响

作  者:
徐仁扣;肖双成;李九玉
单  位:
中国科学院南京土壤研究所
关键词:
有机酸;可变电荷土壤;铜吸附;吸附机理
摘  要:
采用室内实验方法,研究了3种低分子有机酸对两种可变电荷土壤吸附铜的影响。结果表明,有机酸对铜吸附的影响与有机酸的种类和土壤类型有关,柠檬酸和苹果酸能显著增加可变电荷土壤对铜的吸附,而草酸在低浓度下对铜吸附有一定的增加作用,随着草酸加入量的增加其主要表现为对铜吸附的抑制作用。有机酸主要通过与铜形成表面三元络合物来增加铜的吸附量,以这一机制吸附的铜不能为中性盐NaNO3交换而解吸,因此可以降低铜的活动性和生物有效性。
译  名:
Effect of Low Molecular Weight Organic Carboxylic Acids on Adsorption of Copper by Variable Charge Soils
作  者:
XU Ren kou, XIAO Shuang cheng, LI Jiu yu(Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008, China)
关键词:
organic acid; variable charge soil; adsorption of copper; adsorption mechanism
摘  要:
Effect of low molecular weight organic carboxylic acids on adsorption of copper by variable charge soils was investigated using indoor experiment method. The results showed that the effect was related to the kind of organic acids and the type of soils. The adsorption of copper increased significantly with increased citric acid and malic acid, while the adsorption of copper increased with oxalic acid in lower concentration and decreased with oxalic acid in higher concentration. The increased adsorption of copper by organic acids mainly attributed to the formation of soil- organic acid- cation ternary surface complexes. The copper adsorbed in this manner could not be desorbed by NaNO3, which may reduce the mobility of copper in the soil and the availability of copper to plants.

相似文章

计量
文章访问数: 11
HTML全文浏览量: 0
PDF下载量: 0

所属期刊

推荐期刊