Competition from Cu(II), Zn(II) and Cd(II) in Pb(II) Binding to Suwannee River Fulvic Acid

Chakraborty, Parthasarathi; Chakrabarti, Chuni L.

doi:10.1007/s11270-008-9727-7

Cited by 33 publications

(20 citation statements)

References 26 publications

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“…5) show in all cases the release of more than 62% of sorbed Zn (mean 82%), and hence that Zn sorption is much more reversible in these and similar soils than that of Cu , Hg (Yin et al, 1997) or Pb (Strawn and Sparks, 2000). The reversibility of Zn sorption is in keeping with previous reports (Shi et al, 2008), and is attributed to most sorbed Zn being weakly bound to soil constituents (Diesing et al, 2008) and its low affinity for organic matter (Hernández et al, 2007;Chakraborty and Chakrabarti, 2008), for which Cu, Hg and Pb all have high affinity (Olsson et al, 2007;Bai et al, 2008;Chakraborty and Chakrabarti, 2008). Table 4 lists the results of fitting the desorption data with the first order equation…”

Section: Desorption Of Znsupporting

confidence: 83%

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Batch and stirred flow reactor experiments on Zn sorption in acid soils

Fernández‐Calviño¹,

Pérez-Novo²,

Bermúdez-Couso³

et al. 2010

Geoderma

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Section: Desorption Of Znsupporting

confidence: 83%

“…Metal adsorption is highly affected by pH when oxides or hydroxides controlled metal retention. Moreover, Zn affinity for organic matter is much lower than other divalent metals (Hernández et al, 2007;Chakraborty and Chakrabarti, 2008), and therefore, it could be more vulnerable to pH changes.…”

Section: Competitive Sorption Of Zn and Cumentioning

confidence: 99%

Batch and stirred flow reactor experiments on Zn sorption in acid soils

Fernández‐Calviño¹,

Pérez-Novo²,

Bermúdez-Couso³

et al. 2010

Geoderma

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“…The chemistry of trace metals and their interaction with natural ligands (such as, dissolved organic matter) are well studied in aquatic system as reflected by the large numbers of publications available in the literature (Achterberg and Braungardt, 1999;Bayen et al, 2006;Chakraborty, 2010;Chakraborty and Chakrabarti, 2008;Chakraborty et al, 2007;Chakraborty et al, 2009;Gopalapillai et al, 2008;Groschner and Appriou, 1994;Guthrie et al, 2005;Nicolau et al, 2008). However, the knowledge of speciation of trace metals and their interactions with heterogeneous binding sites present in sediments are not well understood.…”

Section: Introductionmentioning

confidence: 99%

Speciation of Co, Ni and Cu in the coastal and estuarine sediments: Some fundamental characteristics

Chakraborty

2012

Journal of Geochemical Exploration

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“…10 Studies have covered the AHS complexation with different metals under different pH conditions, ionic strength and concentration of metals and AHS. [11][12][13][14][15] A recent study demonstrated that solar radiation can also be an important factor in the complexation capacity of AHS with metals. 8,16 These authors showed that radiation alters the complexation capacity that the AHS had when not exposed to radiation previously.…”

Section: Introductionmentioning

confidence: 99%

Solar radiation effect on the complexation capacity of aquatic humic substances with metals

Melo

Toffoli

Moreira

et al. 2012

J. Braz. Chem. Soc.

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Este estudo teve como principal objetivo avaliar o efeito da radiação solar sobre a capacidade de complexação das substâncias húmicas aquáticas (AHS) com as espécies metálicas Al 3+ , Cr 3+ , CrO 42-e Ni 2+ . Microcosmos foram montados com AHS extraídas do Rio Preto com concentração de 5,0 mg L -1 de carbono orgânico dissolvido e diferentes concentrações de metais, sendo expostos à radiação solar in situ. As constantes de estabilidade condicional foram de 2,0 × 10 -2 , 1,1 × 10 -5 e 2,6 × 10 -2 para os complexos AHS-Cr 3+ , AHS-Ni 2+ e AHS-CrO 4 2-, respectivamente. Os resultados mostraram que a radiação solar foi responsável por um decréscimo na capacidade de complexação de 15-26% para AHS-Al 3+ , 15-72% para AHS-Cr 3+ , 12-18% para AHS-CrO 4 2-e de 13-42% para AHS-Ni 2+ . Conclui-se que a radiação solar altera a disponibilidade de metais previamente complexados às AHS, tornando-os disponíveis no corpo aquático.This study had as main objective to assess the effect of solar radiation on the capacity of the aquatic humic substances (AHS) to complex Al 3+ , Cr 3+ , CrO 4 2-and Ni 2+ . Microcosms were prepared with AHS from Preto River containing 5.0 mg L -1 of dissolved organic carbon and different concentrations of metal species, being exposed to solar radiation, in situ. Conditional stability constants obtained for the AHS-Cr 3+ , AHS-Ni 2+ and AHS-CrO 4 2-complexes were 2.0 × 10 -2 , 1.1 × 10 -5 and 2.6 × 10 -2 , respectively. The results showed that solar radiation is responsible for decreasing capacity complexation in 15-26% for AHS-Al 3+ , 15-72% for AHS-Cr 3+ , 12-18% for AHS-CrO 4 2-and 13-42% for AHS-Ni 2+ . We can conclude that solar radiation alters metals' availability previously complexed to AHS, making them available in the aquatic body.Keywords: aquatic humic substances, metal complexation, solar radiation, fluorescence IntroductionAquatic humic substances (AHS) have been intensively studied because they play an essential role in biogeochemical processes. 1,2 They can participate in the complexation reactions with metal ions thereby influencing the transport and availability of them in the environment, 2-4 may suffer interactions with organic compounds and thus, reduce or increase its toxicity to the biota, 4,5 can act in redox 6 and photochemical reactions. 7 Aquatic HS are products of the decomposition of vegetal and animal remains from microbiological transformations. They are normally dark colored organic macromolecules with a high molecular weight, a complex structure consisting of aromatic and aliphatic compounds, which have a large number of functional groups containing oxygen, e.g., carboxylates (-COOH), phenolics (aromatics-OH), alcoholics (-OH), quinones (aromatics=O), among others. 1,2 Depending on the water solubility, AHS can be operationally separated into three fractions: fulvic acids that are soluble in all pH range, humic acids that are soluble in alkaline pH and insoluble in acid pH, and humin that is insoluble in all pH range. It is worth noting that the AHS comprise about 40-60% ...

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Competition from Cu(II), Zn(II) and Cd(II) in Pb(II) Binding to Suwannee River Fulvic Acid

Abstract: This is a study of trace metal competition in the complexation of Pb(II) by well-characterized humic substances, namely Suwannee River Fulvic Acid (SRFA) in model solutions. It was found that Cu (II) seems to compete with Pb

Cited by 33 publications

References 26 publications

Batch and stirred flow reactor experiments on Zn sorption in acid soils

Batch and stirred flow reactor experiments on Zn sorption in acid soils

Speciation of Co, Ni and Cu in the coastal and estuarine sediments: Some fundamental characteristics

Solar radiation effect on the complexation capacity of aquatic humic substances with metals

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