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Measured pore-water concentrations make equilibrium partitioning work--a data analysis.

Rik Kraaij¹, Philipp Mayer, Frans J M Busser

¹Institute for Risk Assessment Sciences, University of Utrecht, Yalelaan 2, PB 80176, 3508 TD Utrecht, The Netherlands.

Environmental Science & Technology

|February 5, 2003

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Sequestration significantly influences hydrophobic organic compound (HOCs) bioaccumulation in sediments. Equilibrium partitioning theory (EqP) accurately describes sediment bioaccumulation when sequestration is considered, simplifying risk assessments.

Area of Science:

Environmental Chemistry
Ecotoxicology
Sediment Contamination

Background:

Sediment-associated hydrophobic organic compounds (HOCs) bioaccumulation is influenced by sequestration.
The applicability of equilibrium partitioning theory (EqP) to sediments with sequestered contaminants is not well understood.

Purpose of the Study:

To evaluate EqP using a process-based approach for sediment bioaccumulation.
To analyze freely dissolved pore-water concentrations of HOCs in relation to bioaccumulation and sequestration.

Main Methods:

Measurement of freely dissolved pore-water concentrations of HOCs.
Analysis of sediment bioaccumulation and sequestration data.
Interpretation of data using EqP principles.

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Main Results:

Sediment bioaccumulation of HOCs (log K(ow) up to 7.5) in Tubificidae is consistent with bioconcentration from pore-water.
Pore-water HOC concentrations (4.5 < log K(ow) < 7.5) are governed by equilibrium partitioning with the rapidly desorbing sediment fraction.
EqP is a valid model for sediment bioaccumulation if sequestration is accounted for.

Conclusions:

EqP provides a conceptually sound framework for sediment bioaccumulation, incorporating sequestration.
Measuring freely dissolved pore-water HOCs allows for simplified risk assessment of sediment-associated HOCs.
Body residues of HOCs in benthic organisms can be estimated from pore-water concentrations and bioconcentration factors.