Study of clay-organic complexes.

摘要

The union of clay minerals and organic substances in soil to form clay-organic complex is a synthesis as vital to continuance of life and as less understood as photosynthesis. The X-ray spectromicroscopy technique has enabled the identification of spatial variability of organic matter forms. Synchrotron-based near-edge X-ray spectromicroscopy of thin sections of entire and intact free organo-mineral microaggregates are able to demonstrate on spatial scales below 50 nm resolution. The zonal concept of clay-organic interactions offers a new basis for understanding and predicting the retention of organic compounds, including contaminants, in soils and sediments. Combination of atomic/molecular structural data and energy derivatives opens up new insights into binding sites and transport forms between biological and/or xenobiotic substances and soil organic matter. Therefore, understanding the mechanism/processes of formation and properties of clay-organic complexes may facilitate development of agricultural management systems that increase long-term C stability or sequestration in soils.