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Toxicokinetics of zinc-oxide nanoparticles and zinc ions in the earthworm Eisenia andrei.
Ecotoxicol Environ Saf. 2017 Sep; 143:151-158.EE

Abstract

The toxicokinetics of zinc in the earthworm Eisenia andrei was investigated following exposure for 21 days to ionic zinc (ZnCl2) or zinc oxide nanoparticles (ZnO-NPs) in Lufa 2.2 soil, followed by 21 days elimination in clean soil. Two concentrations were tested for both ZnCl2 (250 and 500μg Zn g-1) and ZnO-NPs (500 and 1000μg Zn g-1), corresponding to EC25 and EC50 for effects on reproduction. Based on the measured internal Zn concentrations in the earthworms over time of exposure, the kinetics parameters ka - assimilation rate constant (gsoil g-1body weight day-1) and ke - elimination rate constant (day-1) were estimated using a one-compartment model for either total Zn concentrations in the soil or porewater Zn concentrations. In the ZnCl2 treatments, ka was higher for total Zn concentrations in soil, whereas in the ZnO-NP treatments, ka was higher for porewater Zn concentrations. The value of ke did not differ between the two Zn forms (ZnCl2 vs ZnO-NPs) for either EC50 or EC25 when related to total Zn concentrations in soil, but for EC50, ke related to porewater Zn concentrations was significantly higher for ZnCl2 than for ZnO-NPs. It is concluded that differences in kinetic parameters between treatments were connected with exposure concentrations rather than with the form of Zn. Zinc was efficiently regulated by the earthworms in all treatments: a 2-fold increase in exposure concentration resulted in a less than 2-fold increase in internal concentration, and after transfer to uncontaminated soil the internal Zn concentrations in the earthworms returned to ca 111μgg-1 dw in all treatments.

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Authors+Show Affiliations

Świątek ZM
Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland. Electronic address: zuza.swiatek@uj.edu.pl.
van Gestel CAM
Department of Ecological Science, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
Bednarska AJ
Institute of Nature Conservation, Polish Academy of Sciences, Mickiewicza 33, 31-120 Kraków, Poland.

MeSH

AnimalsChloridesMetal NanoparticlesOligochaetaSoil PollutantsToxicokineticsZinc CompoundsZinc Oxide

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28531765

Citation

Świątek, Zuzanna M., et al. "Toxicokinetics of Zinc-oxide Nanoparticles and Zinc Ions in the Earthworm Eisenia Andrei." Ecotoxicology and Environmental Safety, vol. 143, 2017, pp. 151-158.
Świątek ZM, van Gestel CAM, Bednarska AJ. Toxicokinetics of zinc-oxide nanoparticles and zinc ions in the earthworm Eisenia andrei. Ecotoxicol Environ Saf. 2017;143:151-158.
Świątek, Z. M., van Gestel, C. A. M., & Bednarska, A. J. (2017). Toxicokinetics of zinc-oxide nanoparticles and zinc ions in the earthworm Eisenia andrei. Ecotoxicology and Environmental Safety, 143, 151-158. https://doi.org/10.1016/j.ecoenv.2017.05.027
Świątek ZM, van Gestel CAM, Bednarska AJ. Toxicokinetics of Zinc-oxide Nanoparticles and Zinc Ions in the Earthworm Eisenia Andrei. Ecotoxicol Environ Saf. 2017;143:151-158. PubMed PMID: 28531765.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Toxicokinetics of zinc-oxide nanoparticles and zinc ions in the earthworm Eisenia andrei. AU - Świątek,Zuzanna M, AU - van Gestel,Cornelis A M, AU - Bednarska,Agnieszka J, Y1 - 2017/05/19/ PY - 2016/12/15/received PY - 2017/04/25/revised PY - 2017/05/17/accepted PY - 2017/5/23/pubmed PY - 2017/10/4/medline PY - 2017/5/23/entrez KW - Accumulation KW - Elimination KW - Invertebrate KW - Metal KW - Soil SP - 151 EP - 158 JF - Ecotoxicology and environmental safety JO - Ecotoxicol Environ Saf VL - 143 N2 - The toxicokinetics of zinc in the earthworm Eisenia andrei was investigated following exposure for 21 days to ionic zinc (ZnCl2) or zinc oxide nanoparticles (ZnO-NPs) in Lufa 2.2 soil, followed by 21 days elimination in clean soil. Two concentrations were tested for both ZnCl2 (250 and 500μg Zn g-1) and ZnO-NPs (500 and 1000μg Zn g-1), corresponding to EC25 and EC50 for effects on reproduction. Based on the measured internal Zn concentrations in the earthworms over time of exposure, the kinetics parameters ka - assimilation rate constant (gsoil g-1body weight day-1) and ke - elimination rate constant (day-1) were estimated using a one-compartment model for either total Zn concentrations in the soil or porewater Zn concentrations. In the ZnCl2 treatments, ka was higher for total Zn concentrations in soil, whereas in the ZnO-NP treatments, ka was higher for porewater Zn concentrations. The value of ke did not differ between the two Zn forms (ZnCl2 vs ZnO-NPs) for either EC50 or EC25 when related to total Zn concentrations in soil, but for EC50, ke related to porewater Zn concentrations was significantly higher for ZnCl2 than for ZnO-NPs. It is concluded that differences in kinetic parameters between treatments were connected with exposure concentrations rather than with the form of Zn. Zinc was efficiently regulated by the earthworms in all treatments: a 2-fold increase in exposure concentration resulted in a less than 2-fold increase in internal concentration, and after transfer to uncontaminated soil the internal Zn concentrations in the earthworms returned to ca 111μgg-1 dw in all treatments. SN - 1090-2414 UR - https://www.unboundmedicine.com/medline/citation/28531765/Toxicokinetics_of_zinc_oxide_nanoparticles_and_zinc_ions_in_the_earthworm_Eisenia_andrei_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0147-6513(17)30305-6 DB - PRIME DP - Unbound Medicine ER -