Proton binding to humic substances. 2. Chemical heterogeneity and adsorption models

1993 ◽  
Vol 27 (10) ◽  
pp. 2015-2022 ◽  
Author(s):  
Johannes C. M. de Wit ◽  
Willem H. van Riemsdijk ◽  
Luuk K. Koopal
Keyword(s):  
Humic Substances ◽  
Chemical Heterogeneity ◽  
Adsorption Models ◽  
Proton Binding

Long-term effects of amendment with liquid swine manure on proton binding behavior of soil humic substances

Chemosphere ◽  
2006 ◽  
Vol 65 (8) ◽  
pp. 1321-1329 ◽  
Author(s):  
César Plaza ◽  
Diana Hernández ◽  
José M. Fernández ◽  
Alfredo Polo
Keyword(s):  
Humic Substances ◽  
Swine Manure ◽  
Long Term Effects ◽  
Proton Binding ◽  
Binding Behavior ◽  
Liquid Swine Manure

scholarly journals Potentiometric Study on the Proton Binding of Humic Substances

2005 ◽  
Vol 6 (1) ◽  
pp. 25-29 ◽  
Author(s):  
Jinzhou Du ◽  
Nobuaki Sato ◽  
Osamu Tochiyama
Keyword(s):  
Humic Substances ◽  
Proton Binding ◽  
Potentiometric Study

Generic NICA-Donnan Model Parameters for Proton Binding by Humic Substances

2001 ◽  
Vol 35 (10) ◽  
pp. 2049-2059 ◽  
Author(s):  
Christopher J. Milne ◽  
David G. Kinniburgh ◽  
Edward Tipping
Keyword(s):  
Humic Substances ◽  
Model Parameters ◽  
Proton Binding ◽  
Donnan Model

Humic substances' proton-binding equilibria: assessment of errors and limitations of potentiometric data

1999 ◽  
Vol 392 (2-3) ◽  
pp. 333-341 ◽  
Author(s):  
Eduarda B.H Santos ◽  
Valdemar I Esteves ◽  
João P.C Rodrigues ◽  
Armando C Duarte
Keyword(s):  
Humic Substances ◽  
Proton Binding ◽  
Potentiometric Data

scholarly journals Characterization and Differentiation of Chemical Heterogeneity in Humic Substances by Continuous Intrinsic Proton Affinity Distribution

2002 ◽  
Vol 20 (4) ◽  
pp. 337-345 ◽  
Author(s):  
Zhang Hongxia ◽  
Dong Wenming ◽  
Huang Meide ◽  
Tao Zuyi
Keyword(s):  
Humic Substances ◽  
Proton Affinity ◽  
Double Layer ◽  
Fulvic Acids ◽  
Chemical Heterogeneity ◽  
Diffuse Double Layer ◽  
Master Curves ◽  
Titration Curves ◽  
Weathered Coal ◽  
Double Layer Model

The chemical heterogeneity of proton binding on humic substances was studied via continuous intrinsic proton affinity distributions calculated using the condensation approximation from the master curves for two soil fulvic acids (FAs), one soil humic acid (HA) and one fulvic acid obtained from weathered coal. The master curves, i.e. plots of θT,H (the overall protonation degree) versus Hs (the proton concentration in the diffuse double layer), were obtained from potentiometric titration curves at three ionic strengths. The value of Hs was calculated using an electrical double-layer model in which the humic substances were considered as rigid impermeable spheres. For all four samples, the proton affinity distributions were characterized by a few peaks with peak positions in the range 4–5.5. The similarities and differences between the samples studied were discussed.

Proton Binding Properties of Humic Substances Originating from Natural and Contaminated Materials

2009 ◽  
Vol 43 (5) ◽  
pp. 1393-1399 ◽  
Author(s):  
André van Zomeren ◽  
Amélia Costa ◽  
José Paulo Pinheiro ◽  
Rob N. J. Comans
Keyword(s):  
Humic Substances ◽  
Binding Properties ◽  
Proton Binding

Proton binding to humic substances. 1. Electrostatic effects

1993 ◽  
Vol 27 (10) ◽  
pp. 2005-2014 ◽  
Author(s):  
Johannes C. M. de Wit ◽  
Willem H. van Riemsdijk ◽  
Luuk K. Koopal
Keyword(s):  
Humic Substances ◽  
Electrostatic Effects ◽  
Proton Binding

Silicon Tetrachloride Synthesis from Rice Hulls: Transmission and Scanning Electron Microscope Study

1972 ◽  
Vol 30 ◽  
pp. 236-237 ◽  
Author(s):  
Richard S. Thomas ◽  
Prabir K. Basu ◽  
Francis T. Jones
Keyword(s):  
Silicon Tetrachloride ◽  
Silica Sand ◽  
Mineral Matter ◽  
Chemical Heterogeneity ◽  
Scanning Electron Microscope Study ◽  
Rice Hulls ◽  
Hull Structure ◽  
Lower Temperature ◽  
Image Position ◽  
Disposal Problem

Silicon tetrachloride, used in industry for the production of highest purity silicon and silica, is customarily manufactured from silica-sand and charcoal.SiCl4 can also be made from rice hulls, which contain up to 20 percent silica and only traces of other mineral matter. Hulls, after carbonization, actually prove superior as a starting material since they react at lower temperature. This use of rice hulls may offer a new, profitable solution for a rice mill byproduct disposal problem.In studies of the reaction kinetics with carbonized hulls, conversion of SiO2 to SiCl4 was found to proceed within a few minutes to a constant, limited yield which depended reproducibly on the ambient temperature of the reactor. See Fig. 1. This suggested that physical or chemical heterogeneity of the silica in the hull structure might be involved.

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