Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/27416
Title: Spin labeling ESR investigation of the molecular environment of soil interacting with chemical organic contaminants
Authors: Aleksandrova, O. N.
Issue Date: 2013
Citation: Aleksandrova O. N. Spin labeling ESR investigation of the molecular environment of soil interacting with chemical organic contaminants / O. N. Aleksandrova // Journal of Geochemical Exploration. — 2013. — Vol. 129. — P. 6-13.
Abstract: This manuscript elucidates the influence of special functional groups of organic xenobiotic chemicals on partly simultaneous molecular binding mechanisms. Organic xenobiotics are released as contaminants into the environment and are partially bound to soil constituents, such as humic substances (HS) and the mineral phase. The interaction of chemical contaminants with HS of soil was investigated using a labeling technique of soil samples with stable nitroxide radicals as model contaminants. These nitroxide radicals only differed in one functionality, a hydroxy or an amino functional group. Electron spin resonance (ESR) analyses of contaminated soil samples showed that the interaction was a multistage process that comprised an initial increase in the concentration of free organic radicals of soil influenced by contaminants with hydroxy or amino functionality, a decrease in the polarity of the molecular environment of soil, and a change in mobility of contaminant molecules. Towards the end of interaction, the concentration of free organic radicals usually decreased. Binding of contaminants to soil constituents via specific functionality was revealed detecting a change in their ESR spectra. Basing on the ESR analyses, a two-way exchange of protons' electron pairs between contaminants and HS was hypothesized to interpret the beginning of interaction. © 2013 Elsevier B.V.
Keywords: ELECTRON SPIN RESONANCE ANALYSIS
HUMIC SUBSTANCES
NITROXIDE RADICALS
ORGANIC RADICALS
ORGANIC XENOBIOTIC CHEMICALS
SPIN LABELING
ELECTRON SPINS
HUMIC SUBSTANCES
NITROXIDE RADICALS
ORGANIC RADICALS
SPIN LABELING
BIOCHEMISTRY
CONTAMINATION
FUNCTIONAL GROUPS
GEOLOGIC MODELS
IMPURITIES
ORGANIC CHEMICALS
SOIL POLLUTION
SOIL SURVEYS
SOILS
ELECTRON SPIN RESONANCE SPECTROSCOPY
CONCENTRATION (COMPOSITION)
ELECTRON SPIN RESONANCE
FREE RADICAL
HUMIC SUBSTANCE
MOLECULAR ANALYSIS
ORGANIC POLLUTANT
SOIL POLLUTION
XENOBIOTICS
URI: http://hdl.handle.net/10995/27416
SCOPUS ID: 84876706556
WOS ID: 000339627500003
PURE ID: 906833
ISSN: 0375-6742
DOI: 10.1016/j.gexplo.2012.12.016
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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