Document Detail


Fractionation of Suwannee River fulvic acid and aldrich humic acid on alpha-Al2O3: spectroscopic evidence.
MedLine Citation:
PMID:  19192802     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sorptive fractionation of Suwannee River Fulvic Acid (SRFA) and Purified Aldrich Humic Acid (PAHA) on alpha-Al2O3 at pH 6 was probed in the supernatant using different spectroscopic techniques. Comparison of dissolved organic carbon (DOC) analysis with UV/vis spectrophotometric measurements at 254 nm, including specific UV absorbance (SUVA) calculation, revealed a decrease in chromophoric compounds for the nonsorbed extracts after a 24 h contact time. This fractionation, only observable below a certain ratio between initial number of sites of humic substances and of alpha-Al2O3, seems to indicate a higher fractionation for PAHA. C(1s) near-edge X-ray absorption fine structure spectroscopy (NEXAFS) confirmed this trend and points to a decrease in phenolic moieties in the supernatant and to an eventual increase in phenolic moieties on the surface. Time-resolved luminescence spectroscopy (TRLS) of Eu(III) as luminescent probe showed a decrease in the ratio between the (5)D0-->(7)F2 and (5)D0-->(7)F1 transitions for the fractionated organic matter (OM) that is thought to be associated with a lower energy transfer from the OM to Eu(III) due to the loss of polar aromatics. These modifications in the supernatant are a hint for the modification of sorbed humic extracts on the surface.
Authors:
Francis Claret; Thorsten Schäfer; Julien Brevet; Pascal E Reiller
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2009-02-05     Completed Date:  2009-03-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  8809-15     Citation Subset:  IM    
Affiliation:
Commissariat à l'Energie Atomique, CE Saclay, DEN/DANS/DPC/SECR/Laboratoire de Speciation des Radionucléides et des Molécules, Bâtiment 391-P.C. 33, F-91191 Gif-sur-Yvette CEDEX, France.
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MeSH Terms
Descriptor/Qualifier:
Adsorption
Aluminum Oxide / chemistry*
Benzopyrans / chemistry*
Carbon / chemistry
Chemical Fractionation*
Humic Substances*
Organic Chemicals / chemistry
Rivers / chemistry*
Spectrophotometry, Ultraviolet
Time Factors
Chemical
Reg. No./Substance:
0/Benzopyrans; 0/Humic Substances; 0/Organic Chemicals; 1344-28-1/Aluminum Oxide; 479-66-3/fulvic acid; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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