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ARS Home » Research » Publications at this Location » Publication #96519
Title: REACTIONS OF XENOBIOTICS WITH SOIL MINERAL: IMPLICATIONS FOR HUMIC-MINERAL INTERATIONS

Author
item Laird, David

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/22/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Interactions between well characterized reference minerals and both small organic molecules (pyridine, 3-butylpyridine, and atrazine) and large synthetic organic polymers (polyacrylamides) demonstrate the importance of mixed-mode bonding for sorption of organic molecules on mineral surfaces. Soil clay-humic complexes isolated from the Ap horizon of a Webster soil (Typic Haplaquoll) demonstrate substantial differences between fractions with different mineralogy through chemical (C:N, CECom), biochemical (sugars, amino sugars, amino acids, phenolics, and fatty acids), and spectroscopic (FTIR, **13C-CPMAS-NMR) analyses. Humics associated with soil smectites have a lower C:N ratio, lower CECom, less carbonyl C, less amino sugars, and more amino acids compared with humics associated with quartz, illite, and kaolinite. The results suggest that soil clay mineralogy has a large influence on both the nature of mixed mode bonding and the chemistry of humic substances associated with soil clays.