Abstract
AbstractLinear alkylate sulfonate (LAS) adsorption was studied in relation to the pH, cation‐exchange capacity, clay, organic matter, extractable Fe and Al, exchangeable Al, and Fe2O3 contents of several soils. The LAS adsorption correlated highly significantly with the organic matter content (r = 0.81) and the P fixing capacity (r = 0.75) of the soils. With the removal of sesquioxides as the final pretreatment on chloritic, kaolinitic and allophanic soils the LAS adsorption decreased from values of 19 to 48 µ g/g on the untreated soil to a value of zero. When treated with a terminal H2O2 treatment, the adsorption values on the same soils ranged from 17 to 65 µ g/g. The increase apparently occurred as a result of Fe and Al released from organic chelates. The increase in the LAS adsorption from 7 to 27 µ g/g on the untreated soil to 8 to 50 µ g/g after the removal of both the organic matter and sesquioxides in a number of montmorillonitic Wisconsin soils indicates the importance of montmorillonite in LAS adsorption.
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