Toxicity of silver nanoparticles to green algae – towards a biotic ligand understanding

Sacha Laruelle, Sara Nørgaard Sørensen, Denisa Cupi, Christian Engelbrekt, Jon Veinot, Anders Baun

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Abstract

In recent years the effects of silver nanoparticles(AgNP) has become one of the most studied areas of in nanoecotoxicology. Several studies have concluded that the toxicity of AgNP to freshwater organisms may be explained by the release of ionic silver. In this study, a series of experiments with the freshwater green algae Pseudokirschneriella subcapitata were carried out to falsify the hypothesis: “The toxicity of silver nanoparticles towards algae is solely caused by the monovalent silver ion”. These experiments were based on PHREEQC modeling of silver ion behavior (added as AgNO3) in 72h OECD algal growth inhibition tests and a newly developed 4-h photosynthesis inhibition algal test. The tested AgNPs were of the same primary size (30 nm) but with different capping agents (citrate, mercaptoundecanoic acid, …MARINA). Characterization included ICP-OES, DLS, NTA, and TEM before and after incubation. Results show that the toxicity of AgNO3 and citrate-stabilized AgNP decreased significantly when the pH was lowered from 8.2 to 7.0. This is in contrast to PHREEQC predictions, but in agreement with the biotic ligand theory. The poster will focus a trends in changes in toxicity of AgNP as a result modifications of test conditions (pH, addition of mono-valent ions and chelator) benchmarked against changes predicted and observed for AgNO3.
Original languageEnglish
Publication date2013
Number of pages1
Publication statusPublished - 2013
Event7th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials - The Banff Centre, Alberta, Canada
Duration: 10 Sep 201212 Sep 2012
Conference number: 7
https://uofa-cs.gobigevent.com/prothos/onware.x/conference/web/index.p?!=public=13602229427204=1=24645964&Conference=21568

Conference

Conference7th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials
Number7
LocationThe Banff Centre
CountryCanada
CityAlberta
Period10/09/201212/09/2012
Internet address

Activities

  • 2 Participating in or organising a conference

7th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials

Denisa Cupi (Participant)

10 Sep 2012

Activity: Attending an eventParticipating in or organising a conference

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7th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials

Sara Nørgaard Sørensen (Participant)

10 Sep 2012

Activity: Attending an eventParticipating in or organising a conference

File

Cite this

Laruelle, S., Sørensen, S. N., Cupi, D., Engelbrekt, C., Veinot, J., & Baun, A. (2013). Toxicity of silver nanoparticles to green algae – towards a biotic ligand understanding. Abstract from 7th International Conference on the Environmental Effects of Nanoparticles and Nanomaterials, Alberta, Canada.