TEM study of in situ organic matter on continental margins: occurrence and the “monolayer” hypothesis

Synchrotron‐Based Near‐Edge X‐Ray Spectroscopy of Natural Organic Matter in Soils and Sediments

“…They can also alter the nature of samples, yielding misleading data as a result of experimental artifacts (Sparks, 2003) SyNCHROTRON-BASED NEAR-EDgE X-RAy SPECTROSCOPy soil aggregates, mineral surfaces, or sediments. Thus it is not possible to decide whether the organic compounds are in a continuous layer of dispersed coatings or accumulated in distinct patches or microsites (Ransom et al, 1997;Mayer, 1999). Moreover, while these techniques provide atomic-level information, they do not always provide precise information about the local structure of a sorbed species.…”

Clay mineralogy, organic carbon burial, and redox evolution in Proterozoic oceans

“…On the other hand, detrital 2M 1 mica-illite seems to have little direct association with organic matter, implicating weathering-derived (but since transformed) clays in OM burial. (Ransom et al, 1997. Upon deposition in seawater, fine clay crystals tend to flocculate and form aggregates that incorporate significant amounts of OM .…”

“…Upon deposition in seawater, fine clay crystals tend to flocculate and form aggregates that incorporate significant amounts of OM . In the aggregates, the OM tends to be irregularly distributed, occurring as blebs and smears intimately associated with clays (Ransom et al, 1997;Curry et al, 2007). The result of OM incorporation is a significant decrease in permeability, in part from a greater percentage of pore space being occupied by OM and the subsequent creation of inaccessible micro-porosity (Curry et al, 2007).…”

Integrated investigations on the adsorption mechanisms of fulvic and humic acids on three clay minerals

“…Natural organic matter (NOM) is present throughout the ecosystem [1,2], and clay minerals are the important components of soils and sediments which are commonly coated with NOM as organic-clay complexes in the soil and sedimentary environments [3][4][5]. Interactions between NOM and clay minerals are expected to modify surface properties and reactivity of clay minerals [6,7], and change the mobility of pollutants bound to them [8,9].…”