Journal of Food, Agriculture and Environment

Sorption of lead on variable-charge soils in China as affected by initial metal concentration, pH and soil properties

Author(s):

Nkwopara Ugochukwu ^{1, 2}, Ibrahim Ali ¹, Qingling Fu ¹, Jun Zhu¹, Guanjie Jiang ¹, Hongqing Hu¹*

Recieved Date: 2012-07-14, Accepted Date: 2012-10-01

Abstract:

Six variable-charge soils locally referred to as Yellow brown soil (YBS), Latosol soil (LS), Red soil (RS), Lateritic red soil (LRS), Paddy soil (PS) and Yellow soil (YS) and classified as Alfisol, Oxisol, Ultisol, Oxisol, Alfisol and Oxisol, respectively, in the American classification system, were collected from Hubei, Hainan, Guangxi, Jiangxi and Guizhou provinces of China. The adsorption of Pb²⁺ was studied as a function of metal ion concentration and solution pH. The results showed that the amount of Pb adsorbed increased with the increasing concentration of Pb and solution pH, the relationship could be well described by Freundlich isotherm equation. Pb²⁺ showed stronger affinity to paddy soil (PS) at all concentrations and pH. The adsorption capacity of the soils was in the order PS>YS >YBS > RS > LS > LRS. A significant positive correlation (r =  0.91; 0.88; 0.51; 0.77; p≤0.05) was found between the Freundlich Kf and pH, organic matter, CEC and amorphous Al, respectively. A significant negative correlation (r = -0.88, p≤ 0.05) was found between the Freundlich Kf and clay. The Freundlich n was positively correlated with amorphous Fe (r =  0.91, p≤0.05) and negatively correlated with crystalline Al (r = - 0.63, p≤0.05). Soil pH, organic matter, CEC, clay and amorphous Al and Fe are the important soil properties controlling the adsorption of lead in the studied soils. 

Keywords:

Sorption of lead, Pb²⁺concentration, solution pH, soil properties, variable charge soils

---

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1014-1019

---

Full text for Subscribers

---

Information:

Note to users

The requested document is freely available only to subscribers/registered users with an online subscription to the Journal of Food, Agriculture & Environment. If you have set up a personal subscription to this title please enter your user name and password. All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, review or this journal issue, contact us. Specify the title of the article or review, issue, number, volume and date of the publication. Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

---

Purchase this Article:   20 Purchase PDF Order Reprints for 15

---

Share this article :