John Wiley & Sons, Ltd.

Colloidal stability and ecotoxicity of multiwalled carbon nanotubes: Influence of select organic matters

0
In the last few years the release of multiwalled carbon nanotubes (MWCNTs) into the environment has raised serious concerns regarding their fate and potential impacts. Aquatic organisms constitute an important pathway for their entrance and transfer throughout the food webs, and the current demand for standardization of methodologies to analyze the interactions of MWCNTs with them requires aquatic media which represent natural systems. However, the inherent hydrophobicity of MWCNTs and the substances present in natural waters may greatly affect their stability and bioavailability. The present study analyzes the influence of the most referenced synthetic and natural organic matters (Sigma Aldrich Humic Acid and Suwannee River Natural Organic Matter) in the agglomeration kinetics and ecotoxicity of MWCNTs, with the aim of determining their suitability to fulfill the current standardization requirements. Natural organic matter provided an increased colloidal stability to the MWCNTs dispersions, which resulted in higher adverse effects on the key invertebrate organism Daphnia magna. Furthermore, the results obtained with this type of organic matter allowed observing the important role of the outer diameter and content of impurities of MWCNTs in their stability and ecotoxicity on daphnids. Sigma Aldrich Humic Acid seemed to alter the response of the organisms to carbon nanotubes compared to that observed in the presence of natural organic matter. This article is protected by copyright. All rights reserved

Customer comments

No comments were found for Colloidal stability and ecotoxicity of multiwalled carbon nanotubes: Influence of select organic matters. Be the first to comment!