Remediating dicamba-contaminated water with zerovalent iron

C. Gibb, T. Satapanajaru, Steven Comfort, Patrick J Shea

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Dicamba (3,6-dichloro-2-methoxybenzoicacid) is a highly mobile pre- and post-emergence herbicide that has been detected in ground water. We determined the potential of zerovalent iron (Fe0) to remediate water contaminated with dicamba and its common biological degradation product, 3,6-dichlorosalicylic acid (DCSA). Mixing an aqueous solution of 100 μM dicamba with 1.5% Fe0 (w/v) resulted in 80% loss of dicamba within 12 h. Solvent extraction of the Fe0 revealed that dicamba removal was primarily through adsorption; however when the Fe0 was augmented with Al or Fe(III) salts, dicamba was dechlorinated to an unidentified degradation product. In contrast to dicamba, Fe0 treatment of DCSA resulted in removal with some dechlorination observed. When DCSA was treated with Fe0 plus Al or Fe(III) salts, destruction was 100%. Extracts of this Fe0 treatment contained the same HPLC degradation peak observed with the Fe0 + Al or Fe(III) salt treatment of dicamba. Molecular modeling suggests that differences in removal and dechlorination rates between dicamba and DCSA may be related to the type of coordination complex formed on the iron surface. Experiments with 14C-labeled dicamba confirmed that Fe-adsorbed dicamba residues are available for subsequent biological mineralization (11% after 125 d). These results indicate that Fe0 could be potentially used to treat dicamba and DCSA-contaminated water.

Original languageEnglish (US)
Pages (from-to)841-848
Number of pages8
JournalChemosphere
Volume54
Issue number7
DOIs
StatePublished - Jan 1 2004

Fingerprint

Dicamba
Iron
iron
Acids
Water
acid
Dechlorination
dechlorination
Salts
salt
Degradation
water
Molecular modeling
Herbicides
Solvent extraction
herbicide
Groundwater
aqueous solution
mineralization
adsorption

Keywords

  • Biodegradation
  • Dechlorination
  • Molecular modeling
  • Zerovalent iron

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Remediating dicamba-contaminated water with zerovalent iron. / Gibb, C.; Satapanajaru, T.; Comfort, Steven; Shea, Patrick J.

In: Chemosphere, Vol. 54, No. 7, 01.01.2004, p. 841-848.

Research output: Contribution to journalArticle

Gibb, C. ; Satapanajaru, T. ; Comfort, Steven ; Shea, Patrick J. / Remediating dicamba-contaminated water with zerovalent iron. In: Chemosphere. 2004 ; Vol. 54, No. 7. pp. 841-848.
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