Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant

Yanzheng GAO, Wanting LING, Ming Hung WONG

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Abstract

Plant-accelerated dissipation of phenanthrene and pyrene in water in the presence of a nonionic-surfactant (Brij35) was studied. The mechanisms involved were evaluated, based on the investigation of plant uptake of these compounds from water with Brij35. The presence of ryegrass (Lolium multiflorum Lam) clearly enhanced the dissipation of tested PAHs in water with 0–296 mg l⁻¹ Brij35. The first-order rate constants (K), calculated from the first-order kinetic models for these PAH degradation (all significant at P < 0.05, n = 8), of phenanthrene and pyrene in the presence of ryegrass were 16.7–50% and 47.1–108% larger than those of plant-free treatments, whereas half-lives (T⅟₂) of the former were 14.3–33.4% and 32.0–52.0% smaller than the latter, respectively. However, the promotion of PAH dissipation by ryegrass was found to significantly decrease with increasing Brij35 concentrations. In the range of 0–296 mg l⁻¹, low concentrations (⩽74.0 mg l⁻¹) of Brij35 generally enhanced plant uptake and accumulation of phenanthrene and pyrene, based on the observed plant concentrations and accumulated amounts of these chemicals from water. In contrast, Brij35 at relatively high concentrations (⩾148 mg l⁻¹) markedly restricted plant uptake of these PAHs. Plant accumulation of phenanthrene and pyrene accounted for 6.21–35.0% and 7.66–24.3% of the dissipation enhancement of these compounds from planted versus unplanted water bodies. In addition, plant metabolism was speculated to be another major mechanism of plant-accelerated dissipation of these PAHs in water systems. Results obtained from this study provided some insight with regard to the feasibility of phytoremediation for PAH contaminated water bodies with coexisted contaminants of surfactants. Copyright © 2005 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1560-1567
JournalChemosphere
Volume63
Issue number9
DOIs
Publication statusPublished - Jun 2006

Fingerprint

Pyrene
Nonionic surfactants
phenanthrene
pyrene
Surface-Active Agents
Polycyclic aromatic hydrocarbons
surfactant
dissipation
Water
Lolium
PAH
water
Body Water
Metabolism
Environmental Biodegradation
Rate constants
phytoremediation
Surface active agents
half life
Impurities

Citation

Gao, Y., Ling, W., & Wong, M. H. (2006). Plant-accelerated dissipation of phenanthrene and pyrene from water in the presence of a nonionic-surfactant. Chemosphere, 63(9), 1560-1567. doi: 10.1016/j.chemosphere.2005.09.058

Keywords

  • Phytoremediation
  • Polycyclic aromatic hydrocarbons (PAHs)
  • Surfactant
  • Plant
  • Water