Indeed, for all studied soils and regardless of the Se species and the presence or not of Ca–zeolite, K d values had a decreasing trend with increasing concentration of the element in the solution.
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Se(IV)/Se(VI) adsorption mechanisms on natural and on Ca-modified zeolite for Mediterranean soils amended with the modified zeolite: prospects for agronomic applications.
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More specifically, selenite adsorption ranged between 9.63 and 190.2 mg kg −1 for alkaline soils, while in the case of acid soils the corresponding values ranged between 15.75 and 284.4 mg kg −1 indicating an increasing trend of adsorption compared to alkaline soils.