Reactions Between Metals and Humified Organic Matter

Bloomfield, C.; Kelso, W. I.; Pruden, G.

doi:10.1111/j.1365-2389.1976.tb01971.x

Cited by 53 publications

(14 citation statements)

References 8 publications

(4 reference statements)

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“…While, contents of extractable Zn, Cu, Fe, and Mn decreased with increasing lime rates in the S2 soil, the same Downloaded by [University of Cambridge] at 19:35 13 June 2016 were increased in the S1 soil (Table 3). Liming these acid soils might have induced two major changes; first, increased microbial activity due to more favorable soil reaction and second, increased metal binding strength of the organic sites (Bloomfield et al, 1976). The decreases in metal contents of this fraction in the S2 soil could be due to microbial mineralization of complexed/occluded metals from organic matter as evident from the decreases in oxidizable organic C due to lime additions.…”

Section: Potassium Pyrophosphate-extractable Fraction (Pyr)mentioning

confidence: 98%

Effect of lime and organic matter on distribution of zinc, copper, iron, and manganese in acid soils

Saha

Adhikari

Mandal

1999

Communications in Soil Science and Plant Analysis

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Liming is essential in highly leached acid soils for increasing soil fertility as it promotes congenial chemical and biological environment. Application of organic matter along with lime has also been found beneficial for crop productivity in such soils. As external addition of organic matter provides easy source of organic carbon (C), it proliferates heterotrophic microorganisms. Addition of such amendments is expected to have profound effect on the availability of cationic micronutrients which are present in low amount. An experiment was undertaken at B.C.K.V., West Bengal, India to study the effect of lime and cellulose (as organic C source) additions on the transformation of zinc (Zn), copper (Cu), iron (Fe), and manganese (Mn) in two soils with different cropping history. Results indicated that in tea garden soil, metals were mobilized into organically complexed (in case of Zn and

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Section: Potassium Pyrophosphate-extractable Fraction (Pyr)mentioning

confidence: 98%

Effect of lime and organic matter on distribution of zinc, copper, iron, and manganese in acid soils

Saha

Adhikari

Mandal

1999

Communications in Soil Science and Plant Analysis

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“…In soil samples with low content of OM (calcaric Fluvisol: A-horizon, 2.6 % OM, loamy Luvisol: A-horizon, 2.8 % OM) the concentrations of Cu and Pb in solution show only a slight increase at neutral to alkaline soil reaction. In this pH range the major proportion of the heavy metals in solution is present as metal-organic complexes ( Bloomfield et al, 1976;Briimmer and Herms, 1983;Jeffery and Uren, 1983;McBride and Bouldin, 1984).…”

Section: Heavy Metals In the Solution Phase Of Soilsmentioning

confidence: 99%

“…The metal-organic complexes of the liquid phases are very likely dominated by negatively charged species (Bloomfield et al, 1976). At pH values below the point of zero charge of pedogenetic iron oxides (pH 6), an adsorption and probably stabilization of these complexes on sites with positive charge takes place.…”

Section: Heavy Metals In the Solution Phase Of Soilsmentioning

confidence: 99%

Heavy metal species, mobility and availability in soils

Bruemmer

Gerth

Herms

1986

J Plant Nutrition & Soil

302

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The ecological effects of heavy metals in soils are closely related to the content and speciation of the elements in the solid and liquid phases of soils. Methods for the determination of metal species in both phases are described and critically evaluated. In connection with the possible binding mechanisms of heavy metals in soils the concept of specific and non-specific adsorption is discussed. Recent results indicate that the adsorption of heavy metals on soil particles is not only restricted to the formation of surface complexes but can also take place in the interior of minerals. Diffusion processes of heavy metals into soil minerals are described for goethite. In order to assess metal mobility and availability in soils, the concentration and speciation of metals in the soil solution or in comparable aeqeous equilibrium solutions of soil samples and the transfer of metals from solid pools to the liquid phase and vice versa have to be assessed. Methods for the determination of the amount of plant available heavy metals are described and the associated problems discussed.Die okologische Wirksamkeit von Schwermetallen in Boden ist eng verknupft mit dem Gehalt und der Art der Schwermetallspezies in der Feststoff-und Lasungsphase der Boden. Es werden Methoden fur die Bestimmung der Schwermetallspezies in beiden Phasen beschrieben und kritisch bewertet . Als wichtigster Mechanismus der Schwermetallbindung in Boden wird die spezifische und unspezifische Schwermetalladsorption diskutiert. Neuere Ergebnisse zeigen, daS die Adsorption von Schwermetallen dabei nicht nur auf Mineraloberflachen, sondern auch im Innern von Mineralpartikeln stattfinden kann. Mechanismus und Art der Diffusionsprozesse von Schwermetallen in das Innere mineralkcher Partikel werden exemplarisch fur die Diffusion von Ni, Zn und Cd in Goethitpartikel beschrieben. Zur Erfassung der Mobilitat und Verfugbarkeit von Schwermetallen in Boden ist die Bestimmung der Konzentration und Art der SchwermetaIlspezies in der Bodenlosung oder in vergleichbaren Gleichgewichtslosungen, z.B. dem Bodensattigungsextrakt, sowie des Metalltransfers von den Feststoffen in die Losungsphase und vice versa erforderlich. Methoden fiir die Bestimmung des Gehaltes an pflanzenverfugbaren Schwermetallen werden beschrieben und die rnit diesen Methoden verknupften Probleme diskutiert. 00463263/86/040~382 $ M.SO/O 0 VCH Verlagsgesellschah mbH, D-6940 Weinheim, 1986 149, 382-398 (1986) Heavy metal species 383

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“…Zinc, Cd, Cu, and Pb are found in soil solutions as complexed metals [13,14]. These soluble organic ligands (i.e., dissolved organic carbon) are exudates from plant roots or are produced from organic matter decomposition.…”

Section: Introductionmentioning

confidence: 99%

Cd, Cu, Pb, AND Zn COPRECIPITATES IN Fe OXIDE FORMED AT DIFFERENT pH: AGING EFFECTS ON METAL SOLUBILITY AND EXTRACTABILITY BY CITRATE

Martı́nez

McBride

2001

Environ Toxicol Chem

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Coprecipitates of heavy metals with Fe oxides may form in contaminated soil, water, and sediment systems, particularly when oxidation-reduction processes are occurring. Once formed, coprecipitates with ferrihydrite could limit heavy metal mobility, solubility, toxicity, and bioavailability in geochemical systems. In this study, Cd, Cu, Pb, and Zn were coprecipitated with Fe by titration to pHs 6 and 7. Metal solubility was monitored during the coprecipitation process to pH 7 and after aging of the product. In the coprecipitate formed at pH 6, metal solubility was determined after the system reached pH 6 and at subsequent time intervals. We also reacted the coprecipitates with citrate and evaluated potential metal availability at increased aging times. The pH of coprecipitate formation had little effect on the long-term solubility of Cu and Zn, whereas soluble Cd was greater in the coprecipitate formed at pH 6. Soluble percentages of metals were low at both pH 6 and 7 for Cu and Pb but averaged 1.5 to 3% for Zn and greater than 40% for Cd. Hysteresis was observed in the coprecipitation curves for Zn and Cd, revealing reduced solubility after adsorption or coprecipitation. Lead and Cu failed to show hysteresis, with strong retention in the solid phase at pH greater than 6. The citrate-extractable fraction was greatest for Cd and Zn, less for Cu, and least for Pb. Citrate-extractable metal was higher for the coprecipitate formed at pH 7 than at pH 6, suggesting increased potential availability from coprecipitates formed at higher pH.

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Reactions Between Metals and Humified Organic Matter

Cited by 53 publications

References 8 publications

Effect of lime and organic matter on distribution of zinc, copper, iron, and manganese in acid soils

Effect of lime and organic matter on distribution of zinc, copper, iron, and manganese in acid soils

Heavy metal species, mobility and availability in soils

Cd, Cu, Pb, AND Zn COPRECIPITATES IN Fe OXIDE FORMED AT DIFFERENT pH: AGING EFFECTS ON METAL SOLUBILITY AND EXTRACTABILITY BY CITRATE

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