In Situ Passive Sampling to Monitor Long Term Cap Effectiveness at a Tidally Influenced Shoreline

Alex V. Smith, Xiaolong Shen, Uriel Garza-Rubalcava, William Gardiner, Danny Reible

Research output: Contribution to journalArticlepeer-review

Abstract

Polydimethylsiloxane solid-phase microextraction passive samplers were used to evaluate long-term performance of a sand/gravel cap placed in 2005 in a tidally influenced shoreline in Puget Sound to reduce polycyclic aromatic hydrocarbon (PAH) transport into overlying surface water. Sampling in both 2010 and 2018 measured porewater concentrations of <1 ng/L total PAHs in the cap layer. d-PAH performance reference compounds were used to evaluate the extent of equilibration of the contaminants onto the samplers and to estimate net upwelling velocities through a masstransfer model. The upwelling velocities were used to predict long-term migration of selected PAHs through the cap, showing that the cap is expected to continue being effective at limiting exposure of contaminants at the cap–water interface.

Original languageEnglish
Article number106
JournalToxics
Volume10
Issue number3
DOIs
StatePublished - Mar 2022

Keywords

  • SPME
  • passive sampling
  • polycyclic aromatic hydrocarbons

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