Phosphate Sorption Capacity, Bonding Energy and Buffering Mechanisms of Wetland Soils in Akwa Ibom State, Nigeria

Us Akpan,Na Nkanga

doi:10.15580/gjas.2017.3.040517047

Abstract

Phosphate Sorption Capacity, Bonding Energy and Buffering Mechanisms of Wetland Soils in Akwa Ibom State, Nigeria

Highlights

Phosphate sorption is either the adsorption or movement of insoluble inorganic P from soil solution to soil mineral solid surfaces, where it accumulates without penetrating the soil structure and absorption, where the soluble inorganic P penetrates into the soil structure
The P extracted from the soil samples were considered to be P adsorbed while P in the leachate samples were considered to be P in solution
The results showed that floodplain soils had the highest mean phosphate adsorption capacity (0.50 mgkg-1), followed by soils of inland depression (0.32 mgkg-1) while coastal swamp soils had the least (0.09 mgkg-1)

Summary

Introduction

Phosphate sorption is either the adsorption or movement of insoluble inorganic P from soil solution to soil mineral solid surfaces, where it accumulates without penetrating the soil structure and absorption, where the soluble inorganic P penetrates into the soil structure. The release of the adsorbed inorganic P from the mineral soil solid into soil solution is described as desorption (Rhue and Harries, 1999). The balance between P adsorption and desorption maintains the equilibrium of P between the soil solution and the soil solid and is described as phosphorus buffering capacity. Phosphorus sorption index of soil is the capacity of soil to remove soluble P (P in solution) through physical, chemical and biological processes, and retain it in a form that is not released under normal environmental conditions (Reddy et al, 1999). According to CadeMenun, (2005) organic P forms increased with decreasing particle size and the smaller the size of soil particles the more reactive and have higher P-retaining capacity due to increased surface area than larger soil particles

Methods

Results

Conclusion