Evaluation of the Hg2+binding potential of fulvic acids from fluorescence excitation–emission matrices

2013 ◽  
Vol 12 (2) ◽  
pp. 384-392 ◽  
Author(s):  
Andrea M. Berkovic ◽  
Fernando S. García Einschlag ◽  
Mónica C. Gonzalez ◽  
Reinaldo Pis Diez ◽  
Daniel O. Mártire
Keyword(s):  
Fulvic Acids ◽  
Binding Potential ◽  
Fluorescence Excitation ◽  
Excitation Emission Matrices ◽  
Fluorescence Excitation Emission Matrices

scholarly journals Fluorescence Excitation Emission Matrices of Human Tissue: A System forin vivoMeasurement and Method of Data Analysis

1999 ◽  
Vol 53 (3) ◽  
pp. 302-311 ◽  
Author(s):  
Andrés F. Zuluaga ◽  
Urs Utzinger ◽  
Anthony Durkin ◽  
Holger Fuchs ◽  
Ann Gillenwater ◽  
...  
Keyword(s):  
Data Analysis ◽  
Human Tissue ◽  
Fluorescence Excitation ◽  
Excitation Emission Matrices ◽  
Fluorescence Excitation Emission Matrices

Usefulness of Fluorescence Excitation−Emission Matrices in Combination with PARAFAC, as Fingerprints of Red Wines

2009 ◽  
Vol 57 (5) ◽  
pp. 1711-1720 ◽  
Author(s):  
Diego Airado-Rodríguez ◽  
Teresa Galeano-Díaz ◽  
Isabel Durán-Merás ◽  
Jens Petter Wold
Keyword(s):  
Red Wines ◽  
Fluorescence Excitation ◽  
Excitation Emission Matrices ◽  
Fluorescence Excitation Emission Matrices

Analysis of fluorescence excitation emission matrices of endometrial tissue

2004 ◽  
Author(s):  
Egidijus Auksorius ◽  
Saulius Juodkazis ◽  
Hiroaki Misawa ◽  
Juozas V. Vaitkus ◽  
Aurelija Vaitkuviene
Keyword(s):  
Endometrial Tissue ◽  
Fluorescence Excitation ◽  
Excitation Emission Matrices ◽  
Fluorescence Excitation Emission Matrices

The influence of aggregation on the redox chemistry of humic substances

2009 ◽  
Vol 6 (2) ◽  
pp. 178 ◽  
Author(s):  
Noel E. Palmer ◽  
Ray von Wandruszka
Keyword(s):  
Ionic Strength ◽  
Humic Substances ◽  
Reduction Potential ◽  
Divalent Cations ◽  
Redox Chemistry ◽  
Fulvic Acids ◽  
Monovalent Cations ◽  
Fluorescence Excitation ◽  
Reduction Potentials ◽  
Fluorescence Excitation Emission Matrices

Environmental context. The ability of humic substances (decaying plant and animal matter) to partake in redox reactions in the environment depends on the extent to which the various humic polymers aggregate in solution to form larger particles. This aggregation, in turn, is predicated on the solution conditions, especially ionic strength, the pH, and the types of cations present. Abstract. Aggregation and conformation play an important role in the aqueous redox chemistry of humic substances (HS). The reduction potentials of dissolved humic and fulvic acids vary with pH, ionic strength, and type of humate used, and depending on the solution conditions, they can abiotically reduce various species. Changes in HS reduction potential ranged from 60 to 140 mV on addition of divalent cations, whereas no significant changes were observed with equivalent additions of monovalent cations. Dynamic light scattering measurements showed that this behaviour paralleled the size changes obtained with humic aggregates under the same conditions. The effect was more pronounced at higher pH, where divalent cations caused a significant decrease in the average hydrodynamic radius, whereas monovalent cations did not. At pH 4, neither mono- nor divalent cations substantially affected aggregate sizes. Quinoid moieties, which are known to play an important role in the redox chemistry of HS, displayed fluorescence excitation–emission matrices with features related to changes in the reduction potential of HS. An increase in the reduction potential (Eh) induced by the addition of Ca2+, for instance, caused a red shift in the excitation–emission matrix maximum.

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