Oxalate extraction of Pb and Zn from polluted soils: Solubility limitations

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Oxalate (Ox) was used to extract Pb and Zn from industrially contaminated soils. Although Ox effectively releases metals bound by hydrous oxide soil components, it forms insoluble salts with some heavy metals unlike conventional extractants (e.g., EDTA). The insolubility of PbOx(s) (Ksp=2.74 × 10-11) precluded the use of Ox as a single-step extradant even for soils mildly contaminated with Pb. The usefulness of Ox as a Zn extradant, however, depends on the level of soil contamination. A Zn solubility model, based on published equilibrium constants, was developed to assess Ox suitability as a function of system conditions. Precipitation of ZnOx(z) hindered Zn recovery under acidic conditions where formation of soluble oxalato complexes was small. For pH < 3, the presence of 1 M Ox actually reduced Zn release compared to simple acid washing. Although Ox displaces oxide-bound metals and thus is potentially useful in soil washing, solubility limitations must be defined for effective remediation of metal-laden soils.

Original languageEnglish (US)
Pages (from-to)105-116
Number of pages12
JournalSoil and Sediment Contamination
Volume8
Issue number1
DOIs
StatePublished - Jan 1 1999

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Oxalates
oxalates
oxalate
polluted soils
Solubility
solubility
Soil
Soils
soil
Metals
Washing
metals
Oxides
oxides
soil washing
Ethylenediaminetetraacetic acid
Equilibrium constants
Remediation
metal
soil pollution

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Soil Science
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

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abstract = "Oxalate (Ox) was used to extract Pb and Zn from industrially contaminated soils. Although Ox effectively releases metals bound by hydrous oxide soil components, it forms insoluble salts with some heavy metals unlike conventional extractants (e.g., EDTA). The insolubility of PbOx(s) (Ksp=2.74 × 10-11) precluded the use of Ox as a single-step extradant even for soils mildly contaminated with Pb. The usefulness of Ox as a Zn extradant, however, depends on the level of soil contamination. A Zn solubility model, based on published equilibrium constants, was developed to assess Ox suitability as a function of system conditions. Precipitation of ZnOx(z) hindered Zn recovery under acidic conditions where formation of soluble oxalato complexes was small. For pH < 3, the presence of 1 M Ox actually reduced Zn release compared to simple acid washing. Although Ox displaces oxide-bound metals and thus is potentially useful in soil washing, solubility limitations must be defined for effective remediation of metal-laden soils.",
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Oxalate extraction of Pb and Zn from polluted soils : Solubility limitations. / Elliott, Herschel Adams; Herzig, L. M.

In: Soil and Sediment Contamination, Vol. 8, No. 1, 01.01.1999, p. 105-116.

Research output: Contribution to journalArticle

TY - JOUR

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