Fluorescence properties of the <5kDa molecular size fractions of a soil humic acid

Geoderma ◽  
2011 ◽  
Vol 163 (1-2) ◽  
pp. 24-29 ◽  
Author(s):  
Claire Richard ◽  
Christian Coelho ◽  
Ghislain Guyot ◽  
Lubov Shaloiko ◽  
Oleg Trubetskoj ◽  
...  
Keyword(s):  
Humic Acid ◽  
Molecular Size ◽  
Fluorescence Properties ◽  
Size Fractions ◽  
Soil Humic Acid

Isotherm and kinetic studies on the adsorption of humic acid molecular size fractions onto clay minerals

2019 ◽  
Vol 38 (6) ◽  
pp. 863-871 ◽  
Author(s):  
Mohamed E. A. El-Sayed ◽  
Moustafa M. R. Khalaf ◽  
James A. Rice
Keyword(s):  
Humic Acid ◽  
Clay Minerals ◽  
Molecular Size ◽  
Kinetic Studies ◽  
Size Fractions

Adsorption of molecular size fractions of humic acid onto anion-doped TiO2specimens

2015 ◽  
Vol 57 (6) ◽  
pp. 2455-2465 ◽  
Author(s):  
P. Akan ◽  
N.C. Birben ◽  
M. Bekbolet
Keyword(s):  
Humic Acid ◽  
Molecular Size ◽  
Size Fractions

Evaluation of photocatalytic degradation of a commercial humic acid in water using a simulated solar UV irradiation and monitoring the changes by size exclusion chromatography

2011 ◽  
Vol 11 (6) ◽  
pp. 692-698 ◽  
Author(s):  
S. Valencia ◽  
J. Marín ◽  
G. Restrepo ◽  
F. H. Frimmel
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Size Exclusion Chromatography ◽  
Uv Irradiation ◽  
Molecular Size ◽  
Size Exclusion ◽  
Size Fractions ◽  
Preferential Adsorption ◽  
Exclusion Chromatography ◽  
Solar Uv

Much research has been undertaken on the photocatalytic degradation of humic substances with titanium dioxide using commercial humic acids (HA), which are extracts from either peat or coal. Most of the research has been focused on the changes in dissolved organic carbon (DOC) and UV254 absorption. These parameters only give a general assessment. This work studies the changes in the physical and structural properties of a commercial humic acid by size exclusion chromatography with DOC and UV254 absorption detection (SEC-DOC, SEC-UV254), and the evolution of halogenated organic compounds (AOX) and trihalomethanes (THMs) during the photocatalytic degradation with simulated solar UV irradiation and Degussa P-25 TiO2. These changes are compared with those reported for natural organic matter (NOM). The photodegradation of commercial HA and NOM proceeds in a similar and sequential manner, initially with the preferential adsorption of larger molecules, then the degradation of these larger molecular size fractions and proceeding towards smaller molecular size fractions, while decreasing THMs and AOX formation potential.

Differences in fluorescence properties between humic acid and its size fractions separated by preparative HPSEC

2013 ◽  
Vol 129 ◽  
pp. 23-27 ◽  
Author(s):  
M. Halim ◽  
R. Spaccini ◽  
E. Parlanti ◽  
A. Amezghal ◽  
A. Piccolo
Keyword(s):  
Humic Acid ◽  
Fluorescence Properties ◽  
Size Fractions

The effect of photocatalytic oxidation on molecular size distribution profiles of humic acid

2015 ◽  
Vol 14 (3) ◽  
pp. 576-582 ◽  
Author(s):  
M. Bekbolet ◽  
S. Sen-Kavurmaci
Keyword(s):  
Humic Acid ◽  
Size Distribution ◽  
Photocatalytic Oxidation ◽  
Molecular Size ◽  
Drastic Change ◽  
Size Fractions ◽  
Excitation Emission Matrix ◽  
Molecular Size Distribution ◽  
Eem Fluorescence

Photocatalytic oxidation leads to a drastic change in excitation emission matrix (EEM) fluorescence features of humic acid molecular size fractions.

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

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