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Measuring pyrethroids in sediment pore water using matrix-solid phase microextraction.

Wesley Hunter¹, Yu Yang, Fredrik Reichenberg

¹Department of Environmental Sciences, University of California, 2258 Geology, Riverside, California 92521, USA. whunt001@ucr.edu

Environmental Toxicology and Chemistry

|August 21, 2008

Summary

A new solid-phase microextraction (SPME) method detects trace levels of nonlabeled pyrethroids in sediment pore water. This technique, using polydimethylsiloxane fibers, offers a faster and more sensitive approach for assessing insecticide bioavailability and toxicity in aquatic environments.

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Area of Science:

Environmental Chemistry
Ecotoxicology
Analytical Chemistry

Background:

Pyrethroids are widely used hydrophobic insecticides with high aquatic toxicity.
Their presence in sediments raises concerns about bioavailability and ecological risk.
Previous studies indicated a correlation between pyrethroid uptake by organisms and SPME fiber measurements.

Purpose of the Study:

To develop a solid-phase microextraction (SPME) technique for detecting trace levels of nonlabeled pyrethroids in sediment.
To optimize SPME conditions for measuring freely dissolved pyrethroid concentrations in pore water.
To assess the efficiency and sensitivity of the developed SPME method for environmental monitoring.

Main Methods:

Utilized disposable polydimethylsiloxane (PDMS) fibers for SPME.

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Measured freely dissolved concentrations of seven pyrethroids (bifenthrin, fenpropathrin, cis-permethrin, trans-permethrin, cyfluthrin, cypermethrin, esfenvalerate) in pore water.

Compared agitated (shaker at low speed) versus static conditions for reaching partition equilibrium.

Determined PDMS to water partition ratios (K(PDMS)) for the target pyrethroids.

Main Results:

Partition equilibrium was achieved faster (<5 days) under agitated conditions compared to static conditions (>23 days).
Measured K(PDMS) values for the seven pyrethroids ranged from 2.83 x 10^5 to 1.89 x 10^6.
The agitated matrix-SPME method successfully detected pore-water concentrations as low as 0.1 ng/L in field-contaminated sediments.

Conclusions:

The developed agitated matrix-SPME method is effective for quantifying trace levels of nonlabeled pyrethroids in sediment pore water.
This technique provides a sensitive tool for assessing pyrethroid bioavailability in aquatic ecosystems.
The method can be integrated with bioassays and field monitoring to better predict sediment toxicity.