The robustness of single-point Tenax extractions of pyrethroids: Effects of the Tenax to organic carbon mass ratio on exposure estimates

Single-point Tenax extractions (SPTEs) of hydrophobic organic contaminants provide estimates of bioaccessibility through consistent measures of the chemical concentration initially in the rapidly desorbing fraction in sediment (C ), such that a constant ratio is expected between SPTE and C (C /C, where T is the duration of the SPTE). As environmental factors (i.e., aging time and organic carbon content) and contaminant hydrophobicity can affect the C , the utility of the SPTEs as exposure estimates hinges on the consistency of the C /C ratio. Individually these factors have little impact on the ability of SPTEs to represent bioaccumulation, but the effect of these factors in combination, as well as SPTE methodological variation on the C /C ratio is poorly understood. The current study evaluated how environmental and methodological variation-expressed as varying Tenax to organic carbon mass (Tenax:OC) ratios-impacts the C/C ratio of pyrethroids in laboratory-spiked sediments. A multiple regression analysis was used to examine the impact of organic carbon, pyrethroid hydrophobicity, Tenax mass, and aging time on the C/C ratio. Only aging time of the pyrethroids in sediment significantly affected the C/C ratio with a slight decline of -0.0027/d in the C/C ratio, and this decline was considered negligible as a consistent C/C ratio of 1.46 ± 0.03 was observed across all experimental treatments. This result further demonstrates the consistency of SPTEs to estimate bioaccessibility of hydrophobic contaminants in sediment and subsequent exposure.

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Spiking organic chemicals onto sediments for ecotoxicological analyses: an overview of methods and procedures

Picone

Distefano

Marchetto

et al. 2022

Environ Sci Pollut Res

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The robustness of single-point Tenax extractions of pyrethroids: Effects of the Tenax to organic carbon mass ratio on exposure estimates

Cited by 12 publications

References 45 publications

Using Tenax Extractable Concentrations to Determine the Bioavailable Contaminant Fraction in Sediments

Using Tenax Extractable Concentrations to Determine the Bioavailable Contaminant Fraction in Sediments

Methodological and Environmental Impacts on Bioaccessibility Estimates Provided by Single-Point Tenax Extractions

Spiking organic chemicals onto sediments for ecotoxicological analyses: an overview of methods and procedures

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