Zinc adsorption-desorption isotherms: possible effects on the calcareous vertisol soils from Jordan
Zinc adsorption-desorption isotherms: possible effects on the calcareous vertisol soils from Jordan
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DOI：
10.1007/s12665-011-1188-4
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发表时间：
2012-04-01
影响因子：
2.8
通讯作者：
Al-Muhtaseb, Ala'a H.
中科院分区：
文献类型：
--
作者：
Hararah, Muhanned A.;Al-Nasir, Farah;Al-Muhtaseb, Ala'a H.
石灰性潮土是约旦农业土壤的主要类型，占约旦农业耕地的80%以上。这类土壤具有高pH和高CaCO3含量的特点，这使得包括锌在内的重金属被氧化和吸附到土壤上。因此，这类土壤被认为是潜在的缺锌土壤。研究了锌初始浓度和平均降雨量对三种石灰性潮土锌吸附和解吸的影响。在平衡状态下，三种土壤对锌的吸附和解吸量均随锌初始浓度的增加而增加。但是，随着锌离子初始浓度的增加，吸附和解吸率下降。此外，结果还表明，降雨对锌在石灰性潮土中的行为没有影响。Freundlich和Redlich-Peterson模型对实验数据提供了最好的表示，其次是朗缪尔模型。
Calcareous vertisol soil is the dominant agricultural soil type and covers over 80% of the agricultural cultivated land in Jordan. This type of soil is characterized by its high pH and CaCO3 content, which made the heavy metals including Zn to be oxidized and adsorbed onto soil. Therefore, this type of soil is regarded as potentially Zn deficient. The effect of Zn initial concentration and average rainfall on the Zn adsorption and desorption from three types of calcareous vertisol soils has been examined. The amount of Zn adsorbed and desorbed at equilibrium increased with increasing Zn initial concentration for each of the three investigated soils. However, the percentage of adsorption and desorption decreased as the initial concentration of Zn ions increased. Moreover, results showed that rainfall has no influence on the behavior of Zn in the calcareous vertisol soils. Freundlich and Redlich-Peterson models provide the best representation of the experimental data, followed by the Langmuir model.