Reaction of aquatic humic substances with manganese and chromium

X Q Lu, W D Johnson, Russell Francis Howe, Y Y Chen

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Ultraviolet-visible and e.s.r. spectroscopies have been used to investigate the reactions of humic substances, extracted from swamp waters, with manganese(VII) and with chromium(VI). Potassium permanganate reacts quickly with humic substances to form manganese(Ir) derivatives. Phenolic groups are probably involved as a similar reaction occurs with simple phenols such as phenol and catechol. Manganese(II) interacts directly with carboxylate anionic groups in humic substances. E.s.r. spectroscopy shows that manganese(Ir) forms outer-sphere complexes with humic substances. E.s.r. spectra show that chromium(vr) is reduced to chromium(v) and then to chromium(III) in the presence of humic substances. The rate reduction of chromium(VI) depends on the concentration of humic substances and on pH, temperature, and u.v.-visible radiation. At pH 3 the rate of formation of chromium(v) is about 100 times faster than the rate of its reduction. At neutral pH and at room temperature the chromium(v) species is stable for a long period.

Original languageEnglish
Pages (from-to)173-179
Number of pages7
JournalAustralian Journal of Chemistry
Volume50
Issue number3
Publication statusPublished - 1997

Keywords

  • water-soluble chromium(V)
  • soil fulvic-acid
  • ligand-exchange
  • chemical speciation
  • organic materials
  • oxalic-acid
  • sea-water
  • complexes
  • reduction
  • ESR

Cite this

Reaction of aquatic humic substances with manganese and chromium. / Lu, X Q ; Johnson, W D ; Howe, Russell Francis; Chen, Y Y .

In: Australian Journal of Chemistry, Vol. 50, No. 3, 1997, p. 173-179.

Research output: Contribution to journalArticle

Lu, XQ, Johnson, WD, Howe, RF & Chen, YY 1997, 'Reaction of aquatic humic substances with manganese and chromium', Australian Journal of Chemistry, vol. 50, no. 3, pp. 173-179.
Lu, X Q ; Johnson, W D ; Howe, Russell Francis ; Chen, Y Y . / Reaction of aquatic humic substances with manganese and chromium. In: Australian Journal of Chemistry. 1997 ; Vol. 50, No. 3. pp. 173-179.
@article{4475d8242ca8472c8af459301c09cff2,
title = "Reaction of aquatic humic substances with manganese and chromium",
abstract = "Ultraviolet-visible and e.s.r. spectroscopies have been used to investigate the reactions of humic substances, extracted from swamp waters, with manganese(VII) and with chromium(VI). Potassium permanganate reacts quickly with humic substances to form manganese(Ir) derivatives. Phenolic groups are probably involved as a similar reaction occurs with simple phenols such as phenol and catechol. Manganese(II) interacts directly with carboxylate anionic groups in humic substances. E.s.r. spectroscopy shows that manganese(Ir) forms outer-sphere complexes with humic substances. E.s.r. spectra show that chromium(vr) is reduced to chromium(v) and then to chromium(III) in the presence of humic substances. The rate reduction of chromium(VI) depends on the concentration of humic substances and on pH, temperature, and u.v.-visible radiation. At pH 3 the rate of formation of chromium(v) is about 100 times faster than the rate of its reduction. At neutral pH and at room temperature the chromium(v) species is stable for a long period.",
keywords = "water-soluble chromium(V), soil fulvic-acid, ligand-exchange, chemical speciation, organic materials, oxalic-acid, sea-water, complexes, reduction, ESR",
author = "Lu, {X Q} and Johnson, {W D} and Howe, {Russell Francis} and Chen, {Y Y}",
year = "1997",
language = "English",
volume = "50",
pages = "173--179",
journal = "Australian Journal of Chemistry",
issn = "0004-9425",
publisher = "CSIRO",
number = "3",

}

TY - JOUR

T1 - Reaction of aquatic humic substances with manganese and chromium

AU - Lu, X Q

AU - Johnson, W D

AU - Howe, Russell Francis

AU - Chen, Y Y

PY - 1997

Y1 - 1997

N2 - Ultraviolet-visible and e.s.r. spectroscopies have been used to investigate the reactions of humic substances, extracted from swamp waters, with manganese(VII) and with chromium(VI). Potassium permanganate reacts quickly with humic substances to form manganese(Ir) derivatives. Phenolic groups are probably involved as a similar reaction occurs with simple phenols such as phenol and catechol. Manganese(II) interacts directly with carboxylate anionic groups in humic substances. E.s.r. spectroscopy shows that manganese(Ir) forms outer-sphere complexes with humic substances. E.s.r. spectra show that chromium(vr) is reduced to chromium(v) and then to chromium(III) in the presence of humic substances. The rate reduction of chromium(VI) depends on the concentration of humic substances and on pH, temperature, and u.v.-visible radiation. At pH 3 the rate of formation of chromium(v) is about 100 times faster than the rate of its reduction. At neutral pH and at room temperature the chromium(v) species is stable for a long period.

AB - Ultraviolet-visible and e.s.r. spectroscopies have been used to investigate the reactions of humic substances, extracted from swamp waters, with manganese(VII) and with chromium(VI). Potassium permanganate reacts quickly with humic substances to form manganese(Ir) derivatives. Phenolic groups are probably involved as a similar reaction occurs with simple phenols such as phenol and catechol. Manganese(II) interacts directly with carboxylate anionic groups in humic substances. E.s.r. spectroscopy shows that manganese(Ir) forms outer-sphere complexes with humic substances. E.s.r. spectra show that chromium(vr) is reduced to chromium(v) and then to chromium(III) in the presence of humic substances. The rate reduction of chromium(VI) depends on the concentration of humic substances and on pH, temperature, and u.v.-visible radiation. At pH 3 the rate of formation of chromium(v) is about 100 times faster than the rate of its reduction. At neutral pH and at room temperature the chromium(v) species is stable for a long period.

KW - water-soluble chromium(V)

KW - soil fulvic-acid

KW - ligand-exchange

KW - chemical speciation

KW - organic materials

KW - oxalic-acid

KW - sea-water

KW - complexes

KW - reduction

KW - ESR

M3 - Article

VL - 50

SP - 173

EP - 179

JO - Australian Journal of Chemistry

JF - Australian Journal of Chemistry

SN - 0004-9425

IS - 3

ER -