A spectrophotometric measurement of soil cation exchange capacity based on cobaltihexamine chloride absorbance |
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| Authors: | Delphine Aran Armand Maul Jean-Franois Masfaraud |
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| Institution: | aLIEBE, CNRS UMR 7146, campus Bridoux, université Paul-Verlaine-Metz, avenue Delestraint, 57070 Metz, France;bLMAM, CNRS UMR 7122, université Paul-Verlaine-Metz, Île-du-Saulcy, 57045 Metz, France |
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| Abstract: | Among numerous methods for cation exchange capacity (CEC) determination for soils and sediments, the cobaltihexamine chloride method is frequently used due to its ability to measure CEC at soil pH. After exchange with Co(NH3)63+ ions, CEC is estimated via the measurement of the Co remaining in solution. The modified method proposed allows a more rapid determination of CEC based on the measurement of the absorbance at 472 nm of the cobaltihexamine chloride solution before and after exchange. This method has been applied to various soil's horizons from four sites, selected to cover a wide range of CEC and pH values. The model obtained allows one to calculate CEC from absorbance at 472 nm with 95% confidence intervals. As CEC is of relevant meaning in agronomical and environmental purposes, and more recently in ecotoxicological studies, this modified method can be proposed as a rapid test for CEC evaluation. |
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| Keywords: | Cation exchange capacity Cobaltihexamine chloride Analytical method SoilsMots clé s: Capacité d’ é change cationique Chlorure de cobaltihexamine Mé thode analytique Sols |
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