%0 Journal Article
%T Monometal and Competitive Adsorption of Cd, Ni, and Zn in Soil Treated with Different Contents of Cow Manure
%A Mostafa Chorom
%A Rahim Mohammadzadeh Karkaragh
%A Babak Kaviani
%A Yusef kianpoor Kalkhajeh
%J Applied and Environmental Soil Science
%D 2013
%I Hindawi Publishing Corporation
%R 10.1155/2013/510278
%X This study was conducted to assess the monometal and competitive adsorption of Cd, Ni, and Zn in the soil incubated with different contents of decayed cow manure ( : 0, : 25, and : 50£¿tha£¿1) for 90-d at 25¡ãC. Sorption isotherms were characterized using the linear Freundlich equation. Most sorption isotherms were well described by the Freundlich equation (maximum and minimum ) and the monometal and competitive adsorption isotherms of Zn, Cd, and Ni followed the L-curve type (L-2). Results showed that the mono- and multimetal sorption amounts increased with an increase in organic amendment content as the sorption capacities for Cd, Ni, and Zn followed the following sequence: . This sequence was consistent with the CEC and particularly pH for the three soils. All soils showed greater sorption capacity for Zn than the other trace elements as the sorption sequence in was , while in both and was . Therefore, the metal-binding sites in OM were more selective for Zn and Ni than Cd. Competition significantly reduced metals , especially for Cd and Ni. 1. Introduction Heavy metal pollution of soils has become a dangerous problem in agricultural production around the world in the past few decades, as a result of anthropogenic activities, such as mining or industrial activities and improper use of heavy metal-enriched materials in agriculture, including chemical fertilizer and pesticides, industrial effluents, sewage sludge, and wastewater irrigation [1, 2]. Anthropogenic trace elements are easily accumulated in the surface soil [3], leading to serious environmental concerns [4]. There is concern that increased anthropogenic inputs of trace elements in soils may result in transport of these metals in the soil profile, leading to the increased concentrations of trace elements in the ground or surface waters [5]. The movement of trace elements in soil is greatly affected by their physicochemical forms in the soil solid phase [6] and adsorption [4]. The most important process that affects heavy metal availability and mobility is sorption onto soil solid phases. Sorption of heavy metals by soil depends on factors such as the nature and content of the mineral and organic constituents, the nature and concentration of the metal, the composition of the soil solution, and pH [7, 8]. Organic matter is one of the major contributors to the ability of soils for retention of heavy metals in an exchangeable form. Moreover, organic matter also improves soil fertility and structure and other soil properties. The effect of organic matter on the reduction of metals in soil solutions
%U http://www.hindawi.com/journals/aess/2013/510278/