Field study on desorption rates of polynuclear aromatic hydrocarbons from contaminated marine sediment

Yong ZHANG, Shiu Sun Rudolf WU, Hua-Sheng HONG, Ka-Fai POON, Michael H. W. LAM

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Abstract

The present study examines desorption kinetics of hydrophobic organic contaminants from sediment under conditions mimicking marine disposal. Trays of contaminated marine sediment were deployed in the subtidal zone of a pristine field site, and samples were taken at time intervals to study the desorption of acenaphthene, benzo[a]anthracene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, chrysene, fluoranthene, naphthalene, and phenanthrene over a period of 51 d. Results of the study indicated that 49.4 to 98.0% of the polycyclic aromatic hydrocarbons (PAHs) in the contaminated sediment were desorbed upon disposal in the coastal environment. The field desorption kinetics of these PAHs can be described by a two-compartment model. The measured slow desorption rate constants, k2, for acenaphthene, benzo[a]anthracene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, chrysene, fluoranthene, naphthalene, and phenanthrene were found to be 0.018, 0.061, 0.016, 0.028, 0.035, 0.021, 0.083, 0.031, and 0.080/d, respectively. Some of these data were in accordance with literature-reported values from laboratory desorption studies in which desorbed PAHs were directly extracted from the aqueous phase. However, they were at least an order of magnitude smaller than those obtained by conventional gas-stripping desorption techniques. Copyright © 2000 SETAC

Original languageEnglish
Pages (from-to)2431-2435
JournalEnvironmental Toxicology and Chemistry
Volume19
Issue number10
DOIs
Publication statusPublished - Oct 2000

Fingerprint

Geologic Sediments
fluoranthene
Polycyclic Aromatic Hydrocarbons
aromatic hydrocarbon
marine sediment
Desorption
desorption
Sediments
Benzo(a)pyrene
PAH
phenanthrene
naphthalene
pyrene
Gases
kinetics
Kinetics
sediment
coastal zone
field study
rate

Citation

Zhang, Y., Wu, R. S. S., Hong, H.‐S., Poon, K.‐F., & Lam, M. H. W. (2000) Field study on desorption rates of polynuclear aromatic hydrocarbons from contaminated marine sediment. Environmental Toxicology and Chemistry, 19(10), 2431-2435. doi: 10.1002/etc.5620191006

Keywords

  • Polycyclic aromatic hydrocarbons
  • Contaminated sediments
  • Environmental fate
  • Desorption kinetics