Up to this point, we have focused mostly on XAFS studies of cation and oxoanion sorption products at mineral-water interfaces and X-ray standing wave studies of the EDL. Organics of various types are also important players in the EDL of natural sorbents and are important sorbates in many environmental systems. Here we summarise some of the results of our in situ (i.e. with liquid water present at ambient T and P) ATR-FTIR spectroscopy studies of the sorption of simple carboxylic acid molecules and natural organic matter (NOM) on model mineral surfaces. ATR-FTIR is arguably the spectroscopic technique of choice...

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