Unraveling
the Relationship between the Concentrations
of Hydrophobic Organic Contaminants in Freshwater Fish of Different
Trophic Levels and Water Using Passive Sampling
Posted on 2020-06-18 - 17:05
The
concentrations of hydrophobic organic compounds (HOCs) in aquatic
biota are used for compliance, as well as time and spatial trend monitoring
in the aqueous environment (European Union water framework directive,
OSPAR). Because of
trophic
magnification in the food chain, the thermodynamic levels of HOCs,
for example, polychlorinated biphenyl congeners, dichlorodiphenyltrichloroethane,
and brominated diphenyl ether congeners, in higher trophic level (TL)
organisms are expected to be strongly elevated above those in water.
This work compares lipid-based concentrations at equilibrium with
the water phase derived from aqueous passive sampling (CL⇌water) with the lipid-based concentrations in
fillet and liver of fish (CL) at different
TLs for three water bodies in the Czech Republic and Slovakia. The CL values of HOCs in fish were near CL⇌water, only after trophic magnification up to
TL = 4. For fish at lower TL, CL progressively
decreased relative to CL⇌water as KOW of HOCs increased above 106. The CL value decreasing toward the bottom of the
food chain suggests nonequilibrium for primary producers (algae),
which is in agreement with modeling passive HOC uptake by algae. Because
trophic magnification and the resulting CL in fish exhibit large natural variability, CL⇌water is a viable alternative for monitoring HOCs
using fish, showing a twofold lower confidence range and requiring
less samples.
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Smedes, Foppe; Sobotka, Jaromír; Rusina, Tatsiana P.; Fialová, Pavla; Carlsson, Pernilla; Kopp, Radovan; et al. (2020). Unraveling
the Relationship between the Concentrations
of Hydrophobic Organic Contaminants in Freshwater Fish of Different
Trophic Levels and Water Using Passive Sampling. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b07821