Optimization of sodium extraction from soil by using a central composite design (CCD) and determination of soil sodium content by ion selective electrodes

Authors : Sevinç KARADAĞ, Emel EREN, Ebru ÇETİNKAYA, Selin ÖZEN, Seda DEVECİ

Pages : 89-96

Doi:10.18393/ejss.2016.2.089-096

View : 43 | Download : 12

Publication Date : 2016-04-02

Article Type : Research Paper

Abstract :Rapid determination of sodium insert ignore into journalissuearticles values(Na); ions in soil samples using ion selective electrodes insert ignore into journalissuearticles values(ISE); was investigated in this study. The compatibility of ISEs with soil extraction solution is a challenging subject as various effects such as pH, ionic strength and other interferences have to be considered as well as efficiency of the extraction solution. Because almost every type of sodium salt is soluble in water, and the pH of water is suitable for ISE studies, it was chosen as the soil extractant. Firstly, the extraction parameters were optimized by using a central composite design insert ignore into journalissuearticles values(CCD);, secondly thirty agricultural soil samples were extracted with water and the extracts were measured by Na-ISE in a previously developed flow system. The results were compared with ion chromatography insert ignore into journalissuearticles values(IC); as the reference method, and the regression analysis between IC and ISE results yielded a high correlation insert ignore into journalissuearticles values(R² = 0.9408);. It was concluded that, ion selective electrodes can be used with water as an extraction solution for rapid determination of sodium in soil samples.
Keywords : Central composite design CCD, ion selective electrodes ISE, soil analysis, sodium

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