Sorption/desorption of nonpolar organic chemicals(NOCs)by natural organic matters(NOM)associated with aquifers,soils and sediments control the bioavailability,risk and fate of NOCs;however,the physicochemical mechanisms of sorption/desorption and reduced bioavailability for NOCs remain unclear.Investigators have recently recognized the importance of organic matter porosity and surface properties in controlling the magnitude and rates of sorption.How the microporosity and micropore size distribution measured by CO2 gas molecules are related to the aqueous sorption capacity for any of NOCs on the various NOMs has not yet been systematically investigated.In this study,we hypothesized that the hydrophobic micropore in glassy NOM could be large enough for accommodating nonpolar organic chemicals.We used a wide range of geosorbents and four NOCs as model sorbates and the gas and aqueous adsorption data to test this hypothesis.
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