Cu<sup>2+</sup> – fulvic acid chelation equilibrium in 0.1 <i>m</i> KCl at 25.0 °C

Gamble, Donald S.; Schnitzer, M.; Hoffman, I.

doi:10.1139/v70-538

Cited by 109 publications

(45 citation statements)

References 11 publications

(13 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since FA is known to form relatively stable water-soluble complexes with Cu ~+ (Schnitzer and Hansen, 1970;Gamble et al, 1970), it appeared possible that complex formation was involved in the interaction of FA with Cu 2+-montmorillonite. To test this point, amounts of Cu 2+ were determined in supernatant solutions and washings from clays that had interacted with FA and with distilled water at pH levels ranging from 2.5 to 6.5.…”

Section: Reaction Of Fa With Cue+-montmorillonitementioning

confidence: 99%

“…CONCLUDING COMMENTS Previous investigations have indicated that in aqueous solutions, in the absence of clay, FA reacts with di-and tri-valent metal ions by two types of reactions to form stable complexes: (a) a (Schnitzer and Skinner, 1965a;Gamble et al, 1970). Water-soluble complexes are usually formed if molear metal/FA ratios are 1 : 1 or less, but if the ratios exceed 1 : 1, the complexes become water-insoluble (Schnitzer, 1971).…”

Section: Reactions Between Fa and Montmorillonite Saturated With Diffmentioning

confidence: 99%

See 1 more Smart Citation

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Schnitzer¹

1972

Clays and Clay Minerals

Self Cite

View full text Add to dashboard Cite

Abstract-Shaking of water-soluble fulvic acid with Cu~+-montmorillonite at pH 2.5 increased the interlamellar spacing from 10.0 to 15' 1 A. The spacings were measured at ~ 0% relative humidity. The extent of interlayer adsorption decreased with increase in pH. Differential thermal analysis and thermogravimetric examinations showed that in addition to interlayer adsorption, fulvic acid was also retained on external clay surfaces. The FA was held so tightly by the Cu~+-clay that > 3/4 of the total amount adsorbed, including degradation products formed from it, resisted decomposition even when heated to 1000~ I.R. spectra showed that fl-diketone groups in fulvic acid reacted with Cu z+ in or on the clay to form acetylacetonate-type chelates. Indications were obtained that the mechanism postulated for the FA-Cu~+-clay interaction may also apply to reactions between FA and montmorillonite saturated with other di-and trivalent metal ions. Reactions of FA in aqueous solutions with metal ions in the presence of clays differ from those in the absence of clay. Montmorillonite appears to affect the conformation of the fulvic acid polymer in a way that favours reactions between C=O groups and metal ions, a type of reaction that has so far not been observed in aqueous solutions in the absence of clay.

show abstract

Section: Reaction Of Fa With Cue+-montmorillonitementioning

confidence: 99%

Section: Reactions Between Fa and Montmorillonite Saturated With Diffmentioning

confidence: 99%

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Schnitzer¹

1972

Clays and Clay Minerals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Depending on the larger number of polar groups contained by M-CSAX, removal Cu 2+ can be obtained by several mechanisms such as physical adsorption, ion exchange, electric neutralisation, and chelation [24].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate and its application in removing heavy metal ions

Wang

Zhang

Chang

2017

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

This paper describes the synthesis and characterisation of a magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate (M-CSAX) nanocomposite based on magnetic starch (MCS), acrylamide (AM) and sodium xanthate that underwent heavy metal ions removal in response to an external magnetic field. The material was prepared using magnetic particle Fe 3 O 4 nanoflakes (NFs) together with vinylated starch and poly(acrylamide)-cosodium xanthate via an ultrasound-assisted radical crosslinking/ polymerisation reaction. MCS was synthesised by a direct compounding method using Fe 3 O 4 NFs as nuclear and vinylated starch as shell. The obtained M-CSAX has a saturation magnetisation value of 19.21 emu¢g ¡1. Flocculation experiment results showed that the composites have functions of removing both turbidity and heavy metal ions from aqueous solution, and can adsorb 78.3% of Pb 2+ and 63% of Cu 2+ from the corresponding salt solutions. The findings of the present work highlight the potential for using M-CSAX as an effective and recyclable adsorbent for wastewater treatment.

show abstract

“…First, a decrease in the pH values of soils after the application of acidic forest litter resulted in an intensive desorption of copper into soil solution [9,18]. Secondly, released copper was bound by low molecular weight organic acids (formed as a result of litter decomposition in biochemical processes) and transformed into the complexed forms [4,6,19] Fig. 3) in the lasts days of incubation.…”

Section: Resultsmentioning

confidence: 99%

Would Forest Litter Cause a Risk of Increased Copper Solubility and Toxicity in Polluted Soils Remediated via Phytostabilization?

Cuske

Karczewska

Gałka

et al. 2017

Pol. J. Environ. Stud.

View full text Add to dashboard Cite

Soil solutions were collected from soils contaminated differently by the emissions from a copper smelter and incubated with beech litter. Five times in 30 days of incubation, soil solutions were acquired with MacroRhizon samplers and examined using the chemometric approach and two ecotoxicological assays: Microtox with Vibrio fischeri bacteria and Phytotoxkit with Sinapis alba seeds. Copper speciation in soil solutions was modeled in the MinteQ program. Application of beech litter to soils resulted in a considerable increase of copper solubility. The toxicity of soil solutions was associated with total copper concentrations in solutions, copper speciation, and pH values. The toxicity measured by the Phytotoxkit test in soil solutions collected from non-amended soils was higher than that measured in Microtox, and was attributed to high concentrations of copper organic complexes in solutions. The application of beech litter, rich in dissolved organic carbon DOC, resulted in a radical increase of soil solution toxicity to both indicating organisms. This effect, particularly well expressed in the case of V. fischeri, was apparently caused by a decrease in pH and associated increase of total Cu concentrations in solutions.

show abstract

Cu²⁺ – fulvic acid chelation equilibrium in 0.1 m KCl at 25.0 °C

Cited by 109 publications

References 11 publications

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Synthesis of magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate and its application in removing heavy metal ions

Would Forest Litter Cause a Risk of Increased Copper Solubility and Toxicity in Polluted Soils Remediated via Phytostabilization?

Contact Info

Product

Resources

About

Cu2+ – fulvic acid chelation equilibrium in 0.1 m KCl at 25.0 °C

Cited by 109 publications

References 11 publications

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Reactions between Fulvic Acid and Cu2+-Montmorillonite*

Synthesis of magnetic crosslinked starch-graft-poly(acrylamide)-co-sodium xanthate and its application in removing heavy metal ions

Would Forest Litter Cause a Risk of Increased Copper Solubility and Toxicity in Polluted Soils Remediated via Phytostabilization?

Contact Info

Product

Resources

About

Cu²⁺ – fulvic acid chelation equilibrium in 0.1 m KCl at 25.0 °C