Adsorption of Heavy Metal Ions onto Insolubilized Humic Acid

AbstractThe generation of humic colloids of Am(III) has been investigated in Gorleben groundwaters containing different amounts of humic substances. Dissolved organic carbon (DOC) in these groundwaters consists mainly of humic acid and fulvic acid, which is present in a colloidal form through aggregation with trace heavy metal ions of groundwater constituents. Concentrations of these heavy metal ions are proportional to the DOC concentration. The generation of Am(III) pseudocolloids through geochemical interactions with humic colloids in different groundwaters is quantified by ultrafiltration as well as ultracentrifugation by the aid of radiometric concentration measurements. The speciation of dissolved Am(III) species in groundwaters is carried out by laser induced photoacoustic spectroscopy (LPAS).

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Competition and complexation of heavy metal ions and humic acid on zeolitic MCM-22 and activated carbon

Chemical Engineering Journal ◽

10.1016/j.cej.2007.08.005 ◽

2008 ◽

Vol 139 (3) ◽

pp. 437-444 ◽

Cited By ~ 52

Author(s):

T. Terdkiatburana ◽

Shaobin Wang ◽

M.O. Tadé

Keyword(s):

Heavy Metal ◽

Activated Carbon ◽

Humic Acid ◽

Metal Ions ◽

Heavy Metal Ions

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Enhanced removal of heavy metal ions bound to humic acid by polyelectrolyte flocculation

Separation and Purification Technology ◽

10.1016/j.seppur.2005.12.022 ◽

2006 ◽

Vol 51 (1) ◽

pp. 48-56 ◽

Cited By ~ 77

Author(s):

Nicholas P. Hankins ◽

Na Lu ◽

Nidal Hilal

Keyword(s):

Heavy Metal ◽

Humic Acid ◽

Metal Ions ◽

Heavy Metal Ions

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Comparative study of binding strengths of heavy metals with humic acid

Hemijska industrija ◽

10.2298/hemind121107002k ◽

2013 ◽

Vol 67 (5) ◽

pp. 773-779 ◽

Cited By ~ 11

Author(s):

Ivana Kostic ◽

Tatjana Andjelkovic ◽

Ruzica Nikolic ◽

Tatjana Cvetkovic ◽

Dusica Pavlovic ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Humic Acid ◽

Metal Ions ◽

Stability Constants ◽

Metal Ion ◽

Heavy Metal Ions ◽

Exchange Method ◽

Divalent Metal Ion ◽

The Stability

The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by method which is based on distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert?s ion exchange method. Experiments were performed at 25 ?C, at pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log ?mn, of complexes formed between the metal ions and humic acid follow the order Co(II) < Ni(II) < Cu(II) > Zn(II) which is the same like in the Irving-Williams series for the binding strength of divalent metal ion complexes. Stability constant of complex between Pb(II) ions and humic acid is greater than stability constants of other investigated metal-humate complexes. The investigation of interaction between heavy metal ions and humics is important for the prediction of the distribution and control of the migration of heavy metals in natural environment.

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