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Toxicity of engineered copper (Cu0) nanoparticles to the green alga Chlamydomonas reinhardtii

Toxicity of engineered copper (Cu0) nanoparticles to the green alga Chlamydomonas reinhardtii Environmental contextEngineered copper nanoparticles are presently under development for various uses and may thus be finally released into the aquatic environment. Copper is well known to be both an essential and a toxic element for aquatic organisms. Here, we investigate the toxicity of copper nanoparticles to a green alga and compare it with the toxicity of dissolved copper.AbstractThe toxicity of carbon-coated copper nanoparticles (CuNPs) to the unicellular green alga Chlamydomonas reinhardtii was investigated and compared with effects of dissolved Cu2. The CuNPs with an original size of 67nm rapidly agglomerated in the medium to average particle sizes of 140200nm. Dissolved Cu from CuNPs increased over 2h to 12 of total Cu. The photosynthetic yield of C. reinhardtii strongly decreased after exposure for 1 or 2h to dissolved CuII in the concentration range 0.110M, whereas this decrease occurred in the total Cu concentration range 1100M after exposure to CuNPs. Effects of CuNPs were compared with those of dissolved CuII on the basis of dissolution experiments. CuNP effects on photosynthetic yield were similar or somewhat stronger for the same dissolved Cu2 concentration. Addition of EDTA as a strong ligand for CuII suppressed the toxicity of dissolved CuII and of CuNPs. These results thus indicate effects on the algae are mostly from free Cu2. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Chemistry CSIRO Publishing

Toxicity of engineered copper (Cu0) nanoparticles to the green alga Chlamydomonas reinhardtii

Mller, Emanuel; Behra, Renata; Sigg, Laura
Environmental Chemistry , Volume 13 (3): 7 – Nov 30, 2015
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References (41)

Publisher
CSIRO Publishing
Copyright
Copyright © The Author(s). Published by CSIRO Publishing
ISSN
1448-2517
eISSN
1449-8979
DOI
10.1071/EN15132
Publisher site
See Article on Publisher Site

Abstract

Environmental contextEngineered copper nanoparticles are presently under development for various uses and may thus be finally released into the aquatic environment. Copper is well known to be both an essential and a toxic element for aquatic organisms. Here, we investigate the toxicity of copper nanoparticles to a green alga and compare it with the toxicity of dissolved copper.AbstractThe toxicity of carbon-coated copper nanoparticles (CuNPs) to the unicellular green alga Chlamydomonas reinhardtii was investigated and compared with effects of dissolved Cu2. The CuNPs with an original size of 67nm rapidly agglomerated in the medium to average particle sizes of 140200nm. Dissolved Cu from CuNPs increased over 2h to 12 of total Cu. The photosynthetic yield of C. reinhardtii strongly decreased after exposure for 1 or 2h to dissolved CuII in the concentration range 0.110M, whereas this decrease occurred in the total Cu concentration range 1100M after exposure to CuNPs. Effects of CuNPs were compared with those of dissolved CuII on the basis of dissolution experiments. CuNP effects on photosynthetic yield were similar or somewhat stronger for the same dissolved Cu2 concentration. Addition of EDTA as a strong ligand for CuII suppressed the toxicity of dissolved CuII and of CuNPs. These results thus indicate effects on the algae are mostly from free Cu2.

Journal

Environmental Chemistry – CSIRO Publishing

Published: Nov 30, 2015

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