Influence of sediment organic carbon on toxicity depends on organism’s trophic ecology

Ferraz, Mariana Aliceda; Choueri, Rodrigo Brasil; Castro, Ítalo Braga; Silva, Cecília Simon da; Gallucci, Fabiane

doi:10.1016/j.envpol.2020.114134

Cited by 16 publications

(5 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Notably, the relevance of DOC-mediated uptake should depend on the DOC source (here: peat moss), 43 the hydrophobicity of the chemical, 41 and the feeding behavior and living locations of the test organisms. 44 3.6. Implications for the Application of Sediment Toxicity Tests.…”

Section: Modeling Temporal Concentration Changessupporting

confidence: 54%

“…The difference between C diss,over and C free,over is expected not to exceed a factor of 2 for K OC ≤ 6 chemicals, but rapidly exceeds a factor of 10 for K OC > 7 chemicals, suggesting that the bound fraction might be an additional uptake route of very hydrophobic chemicals for epibenthic test organisms. Notably, the relevance of DOC-mediated uptake should depend on the DOC source (here: peat moss), the hydrophobicity of the chemical, and the feeding behavior and living locations of the test organisms …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Mind the Exposure Gaps—Modeling Chemical Transport in Sediment Toxicity Tests

Fischer

Hiki

Soetaert

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

Chemical exposure in flow-through sediment toxicity tests can vary in time, between pore and overlying water, and amid free and bound states, complicating the link between toxicity and observable concentrations such as free pore (C free,pore), free overlying (C free,over), or the corresponding dissolved concentrations (C diss, free + bound to dissolved organic carbon, DOC). We introduce a numerical model that describes the desorption from sediments to pore water, diffusion through pores and the sediment–water boundary, DOC-mediated transport, and mixing in and outflow from overlying water. The model explained both the experimentally measured gap between C free,over and C free,pore and the continuous decrease in overlying C diss. Spatially resolved modeling suggested a steep concentration gradient present in the upper millimeter of the sediment due to slow chemical diffusion in sediment pores and fast outflux from the overlying water. In contrast to continuous decrease in overlying C diss expected for any chemical, C free,over of highly hydrophobic chemicals was kept relatively constant following desorption from DOC, a mechanism comparable to passive dosing. Our mechanistic analyses emphasize that exposure will depend on the chemical’s hydrophobicity, the test organism habitat and uptake of bound chemicals, and the properties of sediment components, including DOC. The model can help to re-evaluate existing toxicity data, optimize experimental setups, and extrapolate laboratory toxicity data to field exposure.

show abstract

Section: Modeling Temporal Concentration Changessupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Mind the Exposure Gaps—Modeling Chemical Transport in Sediment Toxicity Tests

Fischer

Hiki

Soetaert

et al. 2021

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Considerations were also made to the accurate dosing of test material to minimise common issues with test material losses to the test vessel walls which can limit bioavailability. Effect of particle size was considered for PHBV (125,250, 500 μm). The results showed that most particles reached maximum mineralisation in 80 days.…”

Section: Biodegradation Testingmentioning

confidence: 99%

“…While a generalization to all sediment organisms cannot be made since the impact of organic matter content on bioavailability in sediment can depend on the organism and their ecology. 125 Furthermore, the adapted composition of the sediment is suggested to better reflect the environmental behavior of the NMs, however, as with any alteration to standard test media its impact on organism health should carefully monitored.…”

Section: Challenges In Following Current Particulate Materials Testin...mentioning

confidence: 99%

Practical considerations to optimize aquatic testing of particulate material, with focus on nanomaterials

Luederwald,

Davies,

Fernandes

et al. 2024

Environ. Sci.: Nano

View full text Add to dashboard Cite

show abstract

“…), which are known to modify exposure and bioavailability, the internal dose achieved, and resulting toxicity. Organic matter (e.g., humic substances) is a well‐recognized toxicity modifier in both water and sediment exposures (Ferraz et al, 2020; Steinberg, 2003). Organic carbon includes only the carbon constituent of organic matter molecules and is the typical surrogate method of quantifying organic matter (Thurman, 1985).…”

Section: Introductionmentioning

confidence: 99%

Avermectin Toxicity to Benthic Invertebrates is Modified by Sediment Organic Carbon and Chemical Residence Time

Jacova

Kennedy

2022

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Chemicals used in sea lice management strategies in salmonid aquaculture include the avermectin class of compounds that can accumulate and persist in the sediments underneath salmon farms and directly impact nontarget benthic fauna. The effects of sediment organic carbon content and chemical residence time (CRT) on the lethal and sublethal toxicity of emamectin benzoate (EB; formulation: Slice®) and ivermectin (purified) and a combination of both were examined in two benthic invertebrates, the amphipod Eohaustorius estuarius and the polychaete Neanthes virens. In both species, increased sediment organic carbon content significantly reduced lethal toxicity, a modulation that was more pronounced for ivermectin and combination exposures. At a CRT of 4 months, lethal toxicity was reduced in E. estuarius but was unaffected in N. virens. Sublethal toxicity in N. virens (burrowing behavior) was modulated by sediment organic carbon and CRT in a similar manner to the trend in lethal toxicity. Inconsistencies in behavior (phototaxis) in E. estuarius made conclusions regarding toxicity modification by sediment organic carbon or CRT inconclusive. Our results indicate that environmental factors including sediment organic carbon content and the time compounds reside in sediments are important modifiers of chemotherapeutant toxicity in nontarget benthic species and should be considered when regulatory decisions regarding their use are made. Environ Toxicol Chem 2022;41:1918–1936. © 2022 SETAC

show abstract

Influence of sediment organic carbon on toxicity depends on organism’s trophic ecology

Cited by 16 publications

References 57 publications

Mind the Exposure Gaps—Modeling Chemical Transport in Sediment Toxicity Tests

Mind the Exposure Gaps—Modeling Chemical Transport in Sediment Toxicity Tests

Practical considerations to optimize aquatic testing of particulate material, with focus on nanomaterials

Avermectin Toxicity to Benthic Invertebrates is Modified by Sediment Organic Carbon and Chemical Residence Time

Contact Info

Product

Resources

About