Kinetic Simulation of Sorption of Copper by Soil and Humic Acid Substrates

• Main Authors: Shu-Pei Yang, 楊淑珮
• Other Authors: Chen-Fang Lin
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/08600897670501808106

碩士 === 國立中興大學 === 土壤環境科學系 === 87 === According to studies that a key role is often played by humic substances on the sorption of heavy metal in soil environment, both in enhancing availability to plants and in reducing toxicity due to complexation.The purpose of this study is to cooperate theories from Spark et al. (1997) and Lin and Chen (1985) to establish a kinetic sorption model of heavy metal, by taking Cu as an example. Under various conditions to simulate the sorption of Cu by soils as affected by humic acid.The method of this research is to establish a kinetic sorption model first, and then to fit with literature data by computer simulation for verifying the model, and finally using the model to study the sorptions of heavy metal as affected by humic acid in different pH condition.The results of the experiment show that the model is capable of fitting sorption data from literatures reasonably well. In the process of the simulations, we found that the rate of Cu sorption reaction at pH 5.0 is much slower than at other pH conditions. The results also showed that pH 6.0 is a boundry. When pH＜6.0, the amount of heavy metal adsorbed increases with humic acid content, but when pH＞6.0, the differences are not significant. Therefore, humic acid plays a more important role in acid soil than in base soil. It also controlled the rates of sorptions in soils.