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Improved determination efficiency of the cation exchange capacity and exchangeable base cations in soil using stirring and extraction modifications

文献类型： 外文期刊

作者： Yuan, Jinhua 1 ; Shengzhe, E. 1 ; Zhao, Xinnan 1 ;

作者机构： 1.Gansu Acad Agr Sci, Inst Soil Fertilizer & Watersaving Agr, Lanzhou 730070, Peoples R China

2.Minist Agr, Gansu Sci Observing & Expt Stn Agroenvironm & Arab, Lanzhou 730070, Peoples R China

关键词： CEC; Ca; Mg; Na; PH

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 248 卷

页码：

收录情况： SCI

摘要： The hexamminecobalt trichloride ([Co(NH3)6]Cl3) method extracts exchangeable (exch.) base cations needing 60 min. For soils containing calcium carbonate, a calcite saturated [Co(NH3)6]Cl3 solution is used to determine the exch. Ca. The preparing time of calcite saturated [Co(NH3)6]Cl3 solution requires to set overnight. This study evaluated the equivalence of [Co(NH3)6]Cl3 method using stirring modification. The proposed modification can vastly save time and the whole extraction time can be shortened to 3-5 min. The preparing calcite saturated [Co (NH3)6]Cl3 solution procedure can be omitted when measured soils containing calcium carbonate. For acidic soil, the measured CEC was below the certified range, the exch. Ca, Na and K were all in the certified value range; the exch. Mg above the certified range. For neural soil, the measured CEC, exch. Ca, Mg, Na and K were all in the certified range. For alkaline soil, the measured CEC was above the certified range, the exch. Ca, Mg, Na and K were all in the certified range. For saline soil, the measured CEC was above the certified range, the exch. Mg and K below the certified range; accurate exch. Ca and Na could not be achieved even in such a short extraction time because of the dissolution of gypsum and sodium salts. For sodic soil, the measured CEC was above the certified range, the exch. Mg and K below the certified range; the extracted Ca can be assumed the exch. Ca; the exch. Na can be calculated as CEC-(exch. Ca + exch. Mg + exch. K). The difference of CEC between measured and certified values were mainly because of the discrepancy of extractant pHs. The addition of CaCO3 (<= 80 %) had no effect on CEC or exch. base cations' determinations. The CaCO3 and CaSO4 center dot 2 H2O combination only affected the determination of exch. Ca.

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