Removal of organic matter and oxides of iron and manganese from soil influences boron adsorption in soil

• Published in: Geoderma Vol. 214-215; pp. 213 - 216
• Main Authors: Sarkar, Dibyendu, De, Dipak Kumar, Das, Ruma, Mandal, Biswapati
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2014; Elsevier
• Subjects: acid soils; Adsorption; Agronomy. Soil science and plant productions; Biological and medical sciences; boron; Boron adsorption; Earth sciences; Earth, ocean, space; Exact sciences and technology; Fe-oxides; Fundamental and applied biological sciences. Psychology; Iron; iron oxides; Isotherms; Least squares method; Manganese; Mn-oxides; Organic matter; Oxides; sodium hypochlorite; Soil (material); soil sampling; Soils; sorption isotherms; Surface chemistry; Surficial geology; Organic matter; Fe-oxides; Mn-oxides; Boron adsorption; oxides; Adsorption site; Adsorption isotherm; Adsorption capacity; acid soils; manganese; Least squares method; optimization; manganese oxides; Aluminium oxide; adsorption; iron oxides; Average; least-squares; in situ; Langmuir isotherm; Treatment; organic materials; iron; sodium Hypochlorites; boron
• ISSN: 0016-7061; 1872-6259
• DOI: 10.1016/j.geoderma.2013.09.009

The influences of specific soil components such as organic matter and oxides of Fe and Mn on B adsorption characteristics are not understood well. In the present study, we compared B adsorption behavior of two acidic soils after removal of organic matter, and Fe- and Mn-oxides with that of untreated soil samples. The B adsorption capacity of the soils before and after removal of different components was low; the average values of maximum B adsorption obtained from nonlinear least square optimization of Langmuir adsorption isotherm being 20.61mgkg−1 for Mallerbari soil and 27.15mgkg−1 for Sikarpur soil. Removal of organic matter by NaOCl treatment from the soils increased B adsorption. This indicates that Fe- and Al-oxides and other available adsorption sites on the mineral surfaces are coated by organic matter and are activated only after removal of organic matter. Removal of Fe- and Mn-oxides, however, resulted considerable decrease in B adsorption in the soils. It is, therefore, suggested that B adsorbing surfaces in soil decrease on removal of Fe- and Mn-oxides, since these oxides are known to have good adsorptive capacity for B. •Low B adsorption is one of the reasons for B deficiency in light textured soils.•Removal of organic matter from soils increases B adsorption.•Removal of Fe- and Mn-oxides decreases B adsorption in soils.