Effect of metal/fulvic acid mole ratios on the binding of Ni(II), Pb(II), Cu(II), Cd(II), and Al(III) by two well-characterized fulvic acids in aqueous model solutions

Sekaly, Amina L.R.; Mandal, Rupasri; Hassan, Nouri M.; Murimboh, John; Chakrabarti, Chuni L.; Back, M. H.; Grégoire, D. Conrad; Schroeder, W. H.

doi:10.1016/s0003-2670(99)00534-6

Cited by 73 publications

(19 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, humic substances usually have strong affinity towards Cd and the complexes formed by them are relatively stable . The effect of humic substances on mobility of metals mainly depends on the solubility of complexes they form together, which mainly depends on the solubility of humic substances . Our results were in a great agreement with Halim and Tang who reported that the contents of exchangeable metals would be sharply reduced by the addition of organic amendments in acidic soils within 1 week and then became relatively steady.…”

Section: Discussionsupporting

confidence: 91%

Effect of humic acid‐based amendments on exchangeable cadmium and its accumulation by rice seedlings

Yao

Yuan

Wan

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

Cadmium (Cd) in the food chain is toxic to humans and mainly attributed to the accumulation by plants. Organic amendments are considered effective to reduce the bioaccessiblity of heavy metals through complexation, only if insoluble complexes are formed. A 42‐day soil incubation followed by a 40‐day rice pot experiment was conducted. The result of the incubation showed that all seven amendments (humic‐ammonium, humic‐calcium, humic‐nitro‐calcium, humic‐urea, humic‐potassium, humic‐nitro‐potassium, and woody peat) significantly increased soil pH and reduced MgCl2‐exchangeable Cd contents by over 32% on day 12. But soil pH decreased and exchangeable Cd contents increased with time and at the end of the incubation, no significant difference in either soil pH or exchangeable Cd contents between CK and most amendments was found. The contents of Cd in rice seedlings were reduced by amendments both under the aged and unaged groups (unaged: soil with freshly added amendments; aged: rice was planted in the soil used in the incubation without further addition of amendments). Compared with the corresponding unaged amendments, the aged amendments significantly increased the contents of Cd in rice shoots, except humic‐potassium. Therefore, the humic acid‐based amendments could reduce exchangeable Cd in soil but the effect was not persistent and accordingly, the unaged amendments would lead to much less Cd accumulation in rice seedlings than the aged ones. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1308–1313, 2017

show abstract

Section: Discussionsupporting

confidence: 91%

Effect of humic acid‐based amendments on exchangeable cadmium and its accumulation by rice seedlings

Yao

Yuan

Wan

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…The concentrations of FA are 20-40-fold higher than HA. Considering that FA are the most soluble fraction of HS, they are assigned as the most important ligands of surface waters [15,16,17]. The fraction of HA in total DOM is insignificant.…”

Section: Resultsmentioning

confidence: 99%

Complexation as the most important factor in the fate and transport of heavy metals in the Dnieper water bodies

Linnik

2003

Anal Bioanal Chem

View full text Add to dashboard Cite

The results of long-term investigations of the concentrations of dissolved forms of some heavy metals (Mn, Cu, Zn, Pb, Cr, Cd) and their species in the water of the Dnieper reservoirs and the Dnieper-Bug estuary are considered. Chemiluminescent methods, anodic stripping voltammetry, membrane filtration, ion-exchange, and gel-permeation chromatography were used for study of the speciation of the metals. It has been found that binding of heavy metals into complexes with dissolved organic matter (DOM) is the dominant factor of their stabilization in solution. The molecular weight distribution of organic metal complexes and their chemical nature, as well as the potential complexing ability of DOM were investigated. Humic substances, particularly fulvic acids, play a major role in the complexation. These ligands bind from 45 to 80% of metals in the form of organic complexes. Metal complex compounds of relatively low molecular weight (<5 kDa) predominated in the organic complexes.

show abstract

“…Organic acids, such as humic and fulvic acids, are prevalent in aquatic systems. Although it has been shown that fulvic acids bind Pb(II) (K d % 10 À2 M) (386,412) and that the rate of Pb II -fulvic acid dissociation is slow (k % 10 À5 s À1 ) (413), the complete role of fulvic and humic acids in aquatic metal speciation remain to be elucidated (49,386,(412)(413)(414)(415). It is clear from these studies, however, that both pH and ligand concentrations have critical influences on the aquatic speciation of Pb.…”

Section: E Lead In Aquatic Systemsmentioning

confidence: 99%

Fundamental Coordination Chemistry, Environmental Chemistry, and Biochemistry of Lead(II)

Claudio

Godwin

Magyar

Progress in Inorganic Chemistry, Volume 51

110

View full text Add to dashboard Cite

Effect of metal/fulvic acid mole ratios on the binding of Ni(II), Pb(II), Cu(II), Cd(II), and Al(III) by two well-characterized fulvic acids in aqueous model solutions

Cited by 73 publications

References 38 publications

Effect of humic acid‐based amendments on exchangeable cadmium and its accumulation by rice seedlings

Effect of humic acid‐based amendments on exchangeable cadmium and its accumulation by rice seedlings

Complexation as the most important factor in the fate and transport of heavy metals in the Dnieper water bodies

Fundamental Coordination Chemistry, Environmental Chemistry, and Biochemistry of Lead(II)

Contact Info

Product

Resources

About