Perchlorate content of plant foliage reflects a wide range of species-dependent accumulation but not ozone-induced biosynthesis

D. A. Grantz, K. O. Burkey, W. A. Jackson, H. B. Vu, M. T. McGrath, G. Harvey

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Perchlorate (ClO4-) interferes with uptake of iodide in humans. Emission inventories do not explain observed distributions. Ozone (O3) is implicated in the natural origin of ClO4 -, and has increased since pre-industrial times. O3 produces ClO4- in vitro from Cl-, and plant tissues contain Cl- and redox reactions. We hypothesize that O 3 exposure may induce plant synthesis of ClO4-. We exposed contrasting crop species to environmentally relevant O3 concentrations. In the absence of O3 exposure, species exhibited a large range of ClO4- accumulation but there was no relationship between leaf ClO4- and O3, whether expressed as exposure or cumulative flux (dose). Older, senescing leaves accumulated more ClO4- than younger leaves. O3 exposed vegetation is not a source of environmental ClO4-. There was evidence of enhanced ClO4- content in the soil surface at the highest O3 exposure, which could be a significant contributor to environmental ClO4-.

Original languageEnglish
Pages (from-to)690-696
Number of pages7
JournalEnvironmental Pollution
Volume184
DOIs
StatePublished - 2014

Keywords

  • Air pollution
  • ClO
  • Crop contamination
  • Gas exchange
  • O
  • Oxidants
  • Ozone
  • Perchlorate

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