Adsorption of heavy metals in andisols, vertisols and humic acids

Acta Agronómica

Cortés Páez, Luis Enrique²  Menjivar Flores, Juan Carlos²  Bravo Realpe, Isabel del Socorro¹  Martín Peinado, Francisco José³ 

[1] Universidad del Cauca, Popayán, Colombia;Universidad Nacional de Colombia, Palmira, Colombia;Universidad de Granada, Granada, España

关键词: Soils;    humic acids;    adsorption;    sorption isotherms;    heavy metals Introducción La presencia de metales pesados en el suelo es debida a causas naturales y antropogénicas;   

DOI  :  10.15446/acag.v64n1.43677

学科分类：农业科学（综合）

来源: Universidad Nacional de Colombia * Facultad de Ciencias Agropecuarias Palmira

【 摘 要 】

This research studied the adsorption of five heavy metals (Cd, Cu, Ni, Pb and Zn) in three adsorbents, two Colombian agricultural soils (Typic Melanudand and fine clay 1% isohyperthermic-Ustic Epiaquert) and humic acids (HA) extracted from leonardite, of Spain. In both, HA and soils, the chemical properties determined were: pH, cation exchange capacity (CEC), organic carbon (% OC), exchangeable bases and total content of metals. The chemical composition of HA was determined using spectrometric techniques as ICP_MS, FTIR, UV-Vis, and CPMAS 13C NMR and Py-GC/MS-THMA. The results from the adsorption of metals in the three adsorbents were adjusted to Freundlich model, and these show a different behavior of the absorbers relative to the metals studied, in the same way the maximum adsorption capacity (K) and the retention force (n) of metals is significantly different (p <0.05). According to K and n of each adsorbent, the adsorption selectivity sequences of the metals has the following order of preference for K: In Humic Acids: Cd> Pb> Cu> Ni> Zn, Andisol: Pb> Cu> Cd> Zn> Ni, and Vertisol: Cd> Pb> Cu> Ni> Zn. For n, Humic Acids: Pb> Zn> Cd> Cu> Ni, Andisol: Cu> Ni> Zn> Pb> Cd, and Vertisol: Zn> Ni> Cu> Pb> Cd

【 授权许可】

Unknown