Effect of lipids on sorption/desorption hysteresis in natural organic matter.
作者： Guangwei Ding , James A. Rice
DOI: 10.1016/J.CHEMOSPHERE.2011.03.009
关键词: Organic chemistry 、 Sorption 、 Analytical chemistry 、 Hydrocarbon 、 Freundlich equation 、 Phenanthrene 、 Organic matter 、 Desorption 、 Chemistry 、 Naphthalene 、 Hysteresis
摘要: Abstract The chemical composition and physical conformation of natural organic matter (NOM) play a major role in regulating its capacity to retain hydrophobic compounds. Naphthalene phenanthrene were used study the correlations between sorption/desorption isotherm nonlinearity compositional data obtained from quantitative 13C solid-state DPMAS NMR spectroscopy for soil peat with or without lipids. Sorption experiments conducted using batch equilibration method. Desorption carried out immediately following sorption by three successive decant-refill cycles. Hysteresis was observed all samples. Nonlinear behavior increased removal lipids NOM. hysteresis index, ratio Freundlich exponents (N values) desorption isotherms, lower lipid-extracted NOM samples than same lipid extraction. relationship extent characteristics spectra indicates that altering through extraction not only proportion aromatic-C content, but also hysteresis. Our suggest index is negatively related aromaticity.
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