Application of the NICA-Donnan model for proton, copper and uranyl binding to humic acid

2004 ◽  
Vol 92 (9-11) ◽  
Author(s):  
Takumi Saito ◽  
S. Nagasaki ◽  
S. Tanaka ◽  
L. K. Koopal
Keyword(s):  
Heavy Metal ◽  
Humic Acid ◽  
Electrostatic Interactions ◽  
Competitive Adsorption ◽  
Copper Ions ◽  
Ion Binding ◽  
Uranyl Ions ◽  
Soil Systems ◽  
Actinide Ions ◽  
Donnan Model

SummaryHumic acids are natural organic materials that play an important role in the migration of heavy metal and actinide ions in aquatic and soil systems. In the present study, the binding of protons, copper ions and uranyl ions to the purified Aldrich humic acid (PAHA) is investigated and the results are modeled with the Non-Ideal Competitive Adsorption (NICA) model extended with electrostatic interactions according to the Donnan model (NICA-Donnan model). The NICA part of the model enables one to describe the competitive ion binding to a heterogeneous substrate taking into account a different stoichiometry per ion. The NICA-Donnan model can describe the binding of the ions to PAHA in large concentration ranges (3<pH<11; 3<pCu<13; 4<pUO

Metal Ion Binding by Humic Acid:  Application of the NICA-Donnan Model

1996 ◽  
Vol 30 (5) ◽  
pp. 1687-1698 ◽  
Author(s):  
David G. Kinniburgh ◽  
Christopher J. Milne ◽  
Marc F. Benedetti ◽  
Jose P. Pinheiro ◽  
Jeroen Filius ◽  
...  
Keyword(s):  
Humic Acid ◽  
Metal Ion ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Donnan Model

scholarly journals Humic matter and contaminants. General aspects and modeling metal ion binding

2001 ◽  
Vol 73 (12) ◽  
pp. 2005-2016 ◽  
Author(s):  
Luuk K. Koopal ◽  
Willem H. van Riemsdijk ◽  
David G. Kinniburgh
Keyword(s):  
Heavy Metal ◽  
Humic Substances ◽  
Fresh Water ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ion Binding ◽  
Inorganic Contaminants ◽  
Metal Ion Binding ◽  
Mineral Particles ◽  
Donnan Model

Humic substances are soil and fresh-water components that play an important role in the binding and transport of both organic and inorganic contaminants. Transport of the contaminants due to ground- and fresh-water dynamics is directly related to the risks associated with contaminations. The mobility of soluble humic substances is related to their interaction with soil mineral particles. Some key references for the binding of organic and inorganic contaminants and for the binding of humics to mineral particles are presented. Humic substances also play a role in the analysis of the contaminants in natural waters and with remediation of water or soil polluted with pesticides, heavy metal ions, and radionuclides. These aspects are illustrated with some examples. The problems that are encountered with the modeling of the binding of contaminants to humics and of heavy metal ions in particular are illustrated by considering the nonideal competitive adsorption model (NICA) extended with electrostatic interactions. The NICA-Donnan model gives quite good results for the description of metal ion binding, as is illustrated for metal ion binding to purified peat humic acid (PPHA). Finally, some remarks are made with respect to the use of the NICA-Donnan model in general purpose speciation programs and of simplified versions of the model for predictions under restricted environmental conditions.

scholarly journals Effects of humic acid on enhanced removal of lead ions by polystyrene-supported nano-Fe (0) nanocomposite

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Luyao Wang ◽  
Shiqiang Wei ◽  
Zhenmao Jiang
Keyword(s):  
Humic Acid ◽  
Electrostatic Interactions ◽  
Competitive Adsorption ◽  
Lead Ions ◽  
Application Process ◽  
Actual Application ◽  
Dispersed Particles ◽  
Cooperation Mechanism ◽  
Positive Effect ◽  
Insight Into

AbstractPolymer-supported nanozero-valent iron composites (D001-nZVI) were fabricated for the removal of lead ions from aqueous solutions by embedding nZVI into the porous polystyrene anion exchanger D001. Humic acid (HA) was selected as a model species because of its ubiquitous existence to gain insight into the influencing factors in the actual application process. The iron contents of the composites were approximately 11.2%, and the smallest ZVI particle size was ~ 5 nm. The experimental results showed that the effect of HA on the reduction of lead ions by D001-nZVI was a concentration-dependent process. At low HA concentrations, the surface-competitive adsorption of HA and Pb2+ dominated; therefore, the removal efficiency of Pb2+ by D001-nZVI decreased from 97.5 to 90.2% with an increasing HA concentration. When the HA concentration increased to 30 mg/L or more, the lead ions removal remained constant with the following possible cooperation mechanism: the competitive adsorption of HA and Pb2+ on the nZVI surface and the well-dispersed particles were caused by electrostatic interactions between the HA coating and the nZVI surface. In addition, the adsorption complexation between HA and Pb2+ also had a positive effect on the removal of Pb2+ at higher concentrations of HA.

Long-Term Copper Toxicity on Scenedesmus quadricauda and Complexing Polypeptides

1995 ◽  
Vol 30 (2) ◽  
pp. 265-276 ◽  
Author(s):  
Denis Bussières ◽  
Raynald Côté ◽  
Clément Richard ◽  
Édith St-Pierre
Keyword(s):  
Heavy Metal ◽  
Sharp Increase ◽  
Copper Ions ◽  
Copper Toxicity ◽  
Scenedesmus Quadricauda ◽  
Continuous Exposure ◽  
Exponential Curve ◽  
Negative Exponential

Abstract Long-term copper toxicity has been demonstrated in Scenedesmus quadricauda. Upon continuous exposure to copper ions at 250 μg/L, the algae responded by a sharp increase in the synthesis of complexing polypeptides to chelate Cu. Complexing polypeptides gradually decreased, as observed by six sampling tests over 732 h, resembling to a negative exponential curve. This gradual diminution is considered to be a prime mechanism of acclimation or of adaptation to a heavy metal contaminated environment.

Metal Ion Binding to Humic Substances: Application of the Non-Ideal Competitive Adsorption Model

1995 ◽  
Vol 29 (2) ◽  
pp. 446-457 ◽  
Author(s):  
Marc F. Benedetti ◽  
Chris J. Milne ◽  
David G. Kinniburgh ◽  
Willem H. Van Riemsdijk ◽  
Luuk K. Koopal
Keyword(s):  
Humic Substances ◽  
Metal Ion ◽  
Competitive Adsorption ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Adsorption Model

scholarly journals Physicochemical Peculiarities of Iodine-Dimethylsulfoxide-H2O Solutions and Effect on Ion Binding to Bovine Serum Albumin

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
K. Grigoryan ◽  
H. Shilajyan
Keyword(s):  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Bovine Serum ◽  
Electrostatic Interactions ◽  
Entropy Change ◽  
Ion Binding ◽  
Fluorescence Energy Transfer ◽  
Iodide Ion ◽  
Different Temperatures ◽  
Fluorescence Energy

The interaction of iodine with bovine serum albumin (BSA) in dimethylsulfoxide (DMSO) aqueous solutions was studied by means of fluorescence and UV/Vis absorption spectroscopy methods. Physicochemical peculiarities of these solutions were revealed. The results showed that the tri-iodide ion formed in the 1DMSO : 2H2O solution caused the fluorescence quenching of BSA. The modified Stern-Volmer quenching constant and corresponding thermodynamic parameters, the free energy change (), enthalpy change (), and entropy change (), at different temperatures (293, 298, and 303 K) were calculated, which indicated that the hydrophobic and electrostatic interactions were the predominant operating forces. The binding locality distance r between BSA and tri-iodide ion at different temperatures was determined based on Förster nonradiation fluorescence energy transfer theory.

Sign in / Sign up

Export Citation Format

Share Document