John Wiley & Sons, Ltd.

Are nanosized or dissolved metals more toxic in the environment? A meta‐analysis

0
Recently, much has been written about the utmost urgency of elaborating the regulations for engineered nanomaterials. It is required from both politicians, to protect people from potentially adverse effects of nanomaterials, and from industry representatives, so that they can prove to have carefully and cautiously produced their nanoproducts and avoid potential court proceedings. However, developing regulations has proven to be a difficult task and an ambiguous topic where errors can easily occur. In the present article we present a meta‐analysis of three different nanomaterials (nano‐Ag, nano‐ZnO and nano‐CuO) by comparing data from ecotoxicity studies and published EC50 values for both the nano‐form and the corresponding dissolved metal. A ratio equal to 1 means that the particle is as toxic as the dissolved metal ion, whereas a lower ratio signifies that the nano‐form is less toxic than the dissolved metal based on total metal concentrations. The results show that for 93.8% (Ag), 100% (Cu) and 81% (Zn) of the ratios considered the nano‐form is less toxic than the dissolved metal in terms of total metal concentration. Very few of the studies surveyed found a ratio of EC50 values for [dissolved/nano] that was larger than 2 (Ag: 1.1%; Cu: 0%; Zn: 2.8%). Hence, a reduction in existing metal concentration thresholds by a factor of 2 in current freshwater and soil regulations for ecotoxicity may be sufficient to protect organisms and the compartments from the nano‐form of these metals as well. Environ Toxicol Chem © 2014 SETAC

Customer comments

No comments were found for Are nanosized or dissolved metals more toxic in the environment? A meta‐analysis. Be the first to comment!