Effects of Porous Medium Geochemical Heterogeneity and Divalent Cations on the Transport of Humic Acid

2016 ◽  
Vol 5 (2) ◽  
pp. 165-172
Author(s):  
R. Ait Akbour ◽  
J. Douch ◽  
A. Jada ◽  
H. Ouachtak ◽  
A. Ait Addi ◽  
...  
Keyword(s):  
Porous Medium ◽  
Humic Acid ◽  
Divalent Cations ◽  
Geochemical Heterogeneity

scholarly journals Strength of Humic Acid Aggregates: Effects of Divalent Cations and Solution pH

ACS Omega ◽  
2019 ◽  
Vol 4 (5) ◽  
pp. 8559-8567 ◽  
Author(s):  
Azizul Hakim ◽  
Tomoharu Suzuki ◽  
Motoyoshi Kobayashi
Keyword(s):  
Humic Acid ◽  
Divalent Cations ◽  
Solution Ph

scholarly journals Study of Complexation Behavior of Lignite Extracted Humic Acid With Some Divalent Cations

2021 ◽  
Author(s):  
Kiran Aftab ◽  
Pervaiz Iqbal ◽  
Muzammil Hussain
Keyword(s):  
Humic Acid ◽  
Metal Complexes ◽  
Divalent Cations ◽  
Environmental Pollutants ◽  
Mineral Fertilizer ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Gravimetric Analysis ◽  
Electron Shuttles ◽  
Essential Nutrient

Abstract In biogeochemical cycles,humic substances are natural electron shuttles in transforming the nutrients and environmental pollutants. The complexes of humic acid with macro and micro nutrient metals serve as ecofriendly organo-mineral fertilizer. In this study, lignite extracted humic acid-metal (Fe, Mg, Zn) complexes were prepared and characterized. The proximate analysis exhibited the moisture, volatile matter, ash and fixed carbon contents of extracted humic acid of 02.61%, 17.31%, 57.18% and 22.90% respectively. The% metal ions in humic acid complexes ranges from 3.5-7.25%. The FTIR analysis of coal extracted humic acids-metal complexes showed Zn, Mg and Fe ions complexed in bidentate manner predominantly with carboxylic acid moiety of humic acid. Thermal gravimetric analysis indicated the higher value of humic acid decomposition as compared to their metal complexes. The thermal stability observed order is HA- Zn >HA-Fe>HA- Mg. The X-ray diffraction pattern pointed toward the non-crystalline nature of humic acid and their respective complex’s due to having few intense and some small diffuse peaks in the 2θ range from 0 to 80°.Hence the humic acid-metals complexes increase the soil humic content along the availability of essential nutrient that enhance the loam biotic action.

scholarly journals The morphology of calcite crystals grown in a porous medium doped with divalent cations

2006 ◽  
Vol 225 (3-4) ◽  
pp. 314-321 ◽  
Author(s):  
L. Fernández-Díaz ◽  
J.M. Astilleros ◽  
C.M. Pina
Keyword(s):  
Porous Medium ◽  
Divalent Cations

Reduction of Pu(V) by humic acid

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
C. André ◽  
Gregory R. Choppin
Keyword(s):  
Humic Acid ◽  
Divalent Cations ◽  
Calcium And Magnesium

The reduction of Pu(V) by humic acid in the presence of divalent cations (calcium and magnesium) was investigated. Tracer concentrations of

scholarly journals Chemotactic Responses to Metals and Anaerobic Electron Acceptors in Shewanella oneidensis MR-1

2005 ◽  
Vol 187 (14) ◽  
pp. 5049-5053 ◽  
Author(s):  
Sira Bencharit ◽  
Mandy J. Ward
Keyword(s):  
Humic Acid ◽  
Electron Acceptor ◽  
Divalent Cations ◽  
Shewanella Oneidensis ◽  
Electron Acceptors ◽  
Anaerobic Conditions ◽  
Acid Analog ◽  
Redox Active ◽  
Insoluble Electron Acceptors ◽  
Reduced Forms

ABSTRACT Although a previous study indicated that the dissimilatory metal-reducing bacterium Shewanella oneidensis MR-1 lacks chemotactic responses to metals that can be used as anaerobic electron acceptors, new results show that this bacterium responds to both Mn(III) and Fe(III). Cells were also shown to respond to another unusual electron acceptor, the humic acid analog anthraquinone-2,6-disulfonate. These results indicate that S. oneidensis is capable of moving towards a number of unusual anaerobic electron acceptors, including some that would normally be insoluble in the environment. Additionally, S. oneidensis was shown to migrate in gradients of several divalent cations under anaerobic conditions. Although responses to the reduced forms of redox-active metals, such as Mn(II) and Fe(II), might indicate that S. oneidensis uses gradients of these metals to locate the insoluble electron acceptors Mn(III/IV) and Fe(III) for dissimilatory purposes, responses to non-redox-active metals, such as Zn(II), suggest that movement towards divalent cations might serve other, potentially assimilatory, purposes.

scholarly journals Transport of Cu2+ in Unsaturated Porous Medium with Humic Acid/Iron Oxide Nanoparticle (Fe3O4) Amendment

Water ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 200
Author(s):  
Shanshan Lin ◽  
Mengdi Shi ◽  
Qi Wang ◽  
Junlin Yang ◽  
Gubin Zhang ◽  
...  
Keyword(s):  
Porous Medium ◽  
Iron Oxide ◽  
Humic Acid ◽  
Fe3o4 Nanoparticles ◽  
Underlying Mechanism ◽  
Isotherm Models ◽  
Iron Oxide Nanoparticle ◽  
Batch Adsorption ◽  
Spectra Analysis ◽  
Unsaturated Porous Medium

Humic acid (HA) and iron oxide (such as Fe3O4) nanoparticles are widely distributed in soil, and their complex embedded in soil might affect the transport and fate of Cu2+ in the vadose zone, while Cu2+ is a serious threat to the underlying groundwater. In this study, we synthesized a composite of Fe3O4 nanoparticles coated with HA (HA@NPs) using as an amendment a packed sand matrix in the transport column experiments. The impacts of HA content and ion strength (IS) on Cu2+ transport in the unsaturated columns were investigated. The results showed that HA exhibited a stronger inhibition effect on Cu2+ transport, and a higher IS enhanced the mobility of Cu2+ in an unsaturated porous medium in the presence of HA@NPs. The recovery ratio (Rr) of Cu2+ breakthrough in the column decreased from 66.56% to 3.94% while the mass concentration ratio CHA/CNPs increased from 0 to 50 in the HA@NPs complex. The Rr increased by 1.64 times while the IS increased from 0 to 100 mM. Batch adsorption experiments, kinetics and isotherm models, and Fourier transform infrared (FTIR) spectra analysis were implemented to elucidate the underlying mechanism. It was found that HA embedded in the sand matrix could bind Cu2+ by forming stable chelate, while the IS-dependent Cu2+ transport could be attributed to the competitive adsorption between Na+ and Cu2+. Our study demonstrates that the physicochemical environment, as well as the presence of iron oxide nanoparticles and natural organic matter, can significantly impact Cu2+ transport in unsaturated porous medium.

scholarly journals The fate and toxicity of Pb-based perovskite nanoparticles on soil bacterial community: Impacts of pH, humic acid, and divalent cations

Chemosphere ◽  
2020 ◽  
Vol 249 ◽  
pp. 126564
Author(s):  
Yujia Zhai ◽  
Zhuang Wang ◽  
Guiyin Wang ◽  
Willie J.G.M. Peijnenburg ◽  
Martina G. Vijver
Keyword(s):  
Humic Acid ◽  
Bacterial Community ◽  
Divalent Cations ◽  
Soil Bacterial Community ◽  
Community Impacts ◽  
Soil Bacterial ◽  
Perovskite Nanoparticles
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