Modeling of diffusion behavior of humic acid and Nd in the presence of humic acid in compacted bentonite

2013 ◽  
Vol 65 ◽  
pp. 66-71 ◽  
Author(s):  
Kazuki Iijima ◽  
Seiichi Kurosawa ◽  
Satoshi Kibe ◽  
Minoru Tobita ◽  
Yuji Ouchi
Keyword(s):  
Humic Acid ◽  
Diffusion Behavior ◽  
Compacted Bentonite

Effect of particle size on the diffusion behavior of some radionuclides in compacted bentonite

1999 ◽  
Vol 270 (1-2) ◽  
pp. 265-272 ◽  
Author(s):  
Tamotsu Kozaki ◽  
Yuichi Sato ◽  
Mamoru Nakajima ◽  
Hiroyasu Kato ◽  
Seichi Sato ◽  
...  
Keyword(s):  
Particle Size ◽  
Diffusion Behavior ◽  
Compacted Bentonite ◽  
Effect Of Particle Size

scholarly journals Diffusion behavior of humic acid during desalination with air gap and water gap membrane distillation

2019 ◽  
Vol 158 ◽  
pp. 182-192 ◽  
Author(s):  
David Amaya-Vías ◽  
Juan A. López-Ramírez ◽  
Stephen Gray ◽  
Jianhua Zhang ◽  
Mikel Duke
Keyword(s):  
Humic Acid ◽  
Membrane Distillation ◽  
Air Gap ◽  
Diffusion Behavior

Through-and Out-Diffusion of Se(IV) and Re(VII) in Compacted Bentonite

2014 ◽  
Vol 953-954 ◽  
pp. 614-620
Author(s):  
Hai Wang ◽  
Tao Wu ◽  
Jiang Chen ◽  
Yao Lin Zhao ◽  
Chao Hui He ◽  
...  
Keyword(s):  
Diffusion Method ◽  
Gmz Bentonite ◽  
Porosity Distribution ◽  
Diffusion Behavior ◽  
Compacted Bentonite ◽  
Anion Diffusion ◽  
Through Diffusion

Through-diffusion and out-diffusion are good way to understand anion diffusion behavior in compacted bentonite. In the present work we investigated Re (VII) and Se (IV) diffusion behavior in 2000 kg/m3 compacted GMZ bentonite. The De values of Re (VII) and Se (IV) are 0.29 ± 0.02 and 0.77 ± 0.05× 10-11 m2/s. The result obtained from out-diffusion method was not agreed with predicted data due to the heterogeneous porosity distribution in clay boundaries and species changed when the diffusion occurred in GMZ bentonite. Comparing the Da values of Se, Tc and I in GMZ and Kunigel-F bentonites, it showed that Kunigel-F bentonite hindered the mobilities of anion more efficiently than GMZ bentonite because of the higher content of montmorillonite.

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.

Changes in the Humic Acid–Metal Complexation Characteristics Depending on Humification Degree / Humīnskābju – Metālu Kompleksveidošanās Rakstura Izmaiņas Atkarībā No Humifikācijas Pakāpes

2012 ◽  
Vol 51 (3) ◽  
pp. 228-237
Author(s):  
D. Dudare ◽  
M. Klavins
Keyword(s):  
Humic Acid ◽  
Stability Constants ◽  
Humic Acids ◽  
Complex Stability ◽  
Peat Layer ◽  
Raised Bog ◽  
Complexing Capacity ◽  
Humification Degree ◽  
Complexation Process ◽  
Complex Stability Constants

The aim of this study is to determine the Cu(II) complexing capacity and stability constants of Cu(II) complexes of humic acids isolated from two well-characterized raised bog peat profiles in respect to the basic properties and humification characteristics of the studied peats and their humic acids. The complex stability constants significantly change within the studied bog profiles and are well correlated with the age and decomposition degree of the peat layer from which the humic acids have been isolated. Among factors that influence this complexation process, molecular mass and ability to form micellar structures (supramolecules) of humic substances are of key importance.

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