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Passive sampling methods for contaminated sediments: Scientific rationale supporting use of freely dissolved concentrations
Author(s) -
Mayer Philipp,
Parkerton Thomas F,
Adams Rachel G,
Cargill John G,
Gan Jay,
Gouin Todd,
Gschwend Philip M,
Hawthorne Steven B,
Helm Paul,
Witt Gesine,
You Jing,
Escher Beate I
Publication year - 2014
Publication title -
integrated environmental assessment and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 57
eISSN - 1551-3793
pISSN - 1551-3777
DOI - 10.1002/ieam.1508
Subject(s) - contamination , benthic zone , environmental chemistry , sediment , environmental science , chemistry , bioaccumulation , sampling (signal processing) , biochemical engineering , geology , ecology , computer science , oceanography , filter (signal processing) , engineering , computer vision , biology , paleontology
Passive sampling methods (PSMs) allow the quantification of the freely dissolved concentration ( C free ) of an organic contaminant even in complex matrices such as sediments. C free is directly related to a contaminant's chemical activity, which drives spontaneous processes including diffusive uptake into benthic organisms and exchange with the overlying water column. Consequently, C free provides a more relevant dose metric than total sediment concentration. Recent developments in PSMs have significantly improved our ability to reliably measure even very low levels of C free . Application of PSMs in sediments is preferably conducted in the equilibrium regime, where freely dissolved concentrations in the sediment are well‐linked to the measured concentration in the sampler via analyte‐specific partition ratios. The equilibrium condition can then be assured by measuring a time series or a single time point using passive samplers with different surface to volume ratios. Sampling in the kinetic regime is also possible and generally involves the application of performance reference compounds for the calibration. Based on previous research on hydrophobic organic contaminants, it is concluded that C free allows a direct assessment of 1) contaminant exchange and equilibrium status between sediment and overlying water, 2) benthic bioaccumulation, and 3) potential toxicity to benthic organisms. Thus, the use of PSMs to measure C free provides an improved basis for the mechanistic understanding of fate and transport processes in sediments and has the potential to significantly improve risk assessment and management of contaminated sediments. Integr Environ Assess Manag 2014;10:197–209. © 2014 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals, Inc. on behalf of SETAC.