ADSORPTION ISOTHERMS OF BORON IN SOIL: THE EFFECTS OF SODIUM ADSORPTION RATIO (SAR), PH AND IONIC STRENGTH

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MOGHBELI M.; FARAHBAKHSH M.; BOROOMAND N.

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Journal: Journal of Water and Soil Year:2017 | Volume:30 | Issue:6 Page(s): 1954-1963

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Title

ADSORPTION ISOTHERMS OF BORON IN SOIL: THE EFFECTS OF SODIUM ADSORPTION RATIO (SAR), PH AND IONIC STRENGTH

Author(s)

MOGHBELI M. | FARAHBAKHSH M. | BOROOMAND N. | Issue Writer Certificate

Keywords

BORONQ2

DIFFUSE DOUBLE LAYERQ1

IONS EXCHANGEABLEQ1

SODIUM ADSORPTION RATIOQ1

Abstract

Introduction: BORON (B) is an essential plant micronutrient whose soil availability is influenced by many soil factors. Understanding the processes controling activity of BORON (B) in the soil solution is important for soil fertility management. The reaction of adsorption and desorption of BORON in soil determines the amount of BORON that is available to plants. Adsorption- desorption processes play a major role on BORON equilibrium concentration and therefore on its bio-availability. Ionic strength, pH and ionic composition in exchangeable phase are among the major factors affecting B adsorption reactions. Reduced adsorption of BORON at high pH is because of a surface potential decrease on minerals with pH-dependent charge.Ionic strength has also a considerable effect on B adsorption. Several studies have been performed in the adsorption of BORON and the effect of factors such as ionic strength and cations has been understudied, however, the effect of SODIUM ADSORPTION RATIO and its interaction with the ionic strength on BORON adsorption behavior has not been reported. In this study, the adsorption isotherms of BORON in the soils affected by the combined effects of ionic strength and SODIUM ADSORPTION RATIO were investigated.Materials and Methods: In order to assess the effects of ionic strength (IS) and SODIUM ADSORPTION RATIO (SAR) on availability of B, the adsorption of B was investigated in a calcareous soil that had low levels of electrical conductivity, SODIUM ADSORPTION RATIO and available P. For this purpose, 5 g soil was equilibrated with 20 mL of B solution (0, 2, 5, 8, 10, 15, 20 mg L-1) in 0.02, 0.06 and 0.12 M background solutions (prepared by NaC1, CaC12.2H2O, MgCl2.6H2O), at two SAR levels (20 and 100).The reaction temperature was 25°C. The suspension was centrifuged, filtered, and a sample was removed and B was determined by Azomethine-H spectrophotometric method (at a wavelength of 420 nm). B adsorption in Soil was obtained by subtracting B in solution after filtration, from added BORON.

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APA: Copy

MOGHBELI, M., FARAHBAKHSH, M., & BOROOMAND, N.. (2017). ADSORPTION ISOTHERMS OF BORON IN SOIL: THE EFFECTS OF SODIUM ADSORPTION RATIO (SAR), PH AND IONIC STRENGTH. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), 30(6 ), 1954-1963. SID. https://sid.ir/paper/141823/en

Vancouver: Copy

MOGHBELI M., FARAHBAKHSH M., BOROOMAND N.. ADSORPTION ISOTHERMS OF BORON IN SOIL: THE EFFECTS OF SODIUM ADSORPTION RATIO (SAR), PH AND IONIC STRENGTH. JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY)[Internet]. 2017;30(6 ):1954-1963. Available from: https://sid.ir/paper/141823/en

IEEE: Copy

M. MOGHBELI, M. FARAHBAKHSH, and N. BOROOMAND, “ADSORPTION ISOTHERMS OF BORON IN SOIL: THE EFFECTS OF SODIUM ADSORPTION RATIO (SAR), PH AND IONIC STRENGTH,” JOURNAL OF WATER AND SOIL (AGRICULTURAL SCIENCES AND TECHNOLOGY), vol. 30, no. 6 , pp. 1954–1963, 2017, [Online]. Available: https://sid.ir/paper/141823/en

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