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Fig. 4. The change of the wavenumber of methyl/methylene peaks by sorbing/mixing HDTMA to soils. The (a) wavenumber of -OH antisymmetric stretching of sorbed water and (b) the wavenumber of C–H stretching of HDTMA and SOM. Volcanic soil is represented by VS. Hexadecyltrimethyl ammonium is represented by HDTMA. Alluvial soil is represented by AS. Hexadecyltrimethyl ammonium chloride is represented by HDTMAC.
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