John Wiley & Sons, Ltd.

Influence of carbon and metal oxide nanomaterials on aqueous concentrations of the munition constituents RDX and tungsten

0
There is an increasing likelihood of interactions between nanomaterials and munitions constituents (MCs) in the environment due to the use of nanomaterials as additives to energetic formulations and potential contact in waste streams from production facilities and runoff from training ranges. The purpose of this research was to determine the ability of nano aluminum oxide (Al2O3) and multi‐walled carbon nanotubes (MWCNTs) to adsorb MCs cyclotrimethylenetrinitramine (RDX) and tungsten (W) from aqueous solution as a first step in determining the long‐term exposure, transport and bioavailability implications of such interactions. Results indicate significant adsorption of RDX by MWCNTs and of W by nano Al2O3 (but not between W and MWCNT or RDX and nano Al2O3). Kinetic sorption and desorption investigations indicated that the most sorption occurs nearly instantaneously (< 5 min), with a relatively slower, secondary binding leading to statistically significant but relatively smaller increases in absorption over 30 d. RDX sorption that occurred during the initial interaction was irreversible with long‐term, reversible sorption likely due to a secondary interaction; however, as interaction time increased, the portion of W irreversibly sorbed onto nano Al2O3 also increased. The present study shows that strong interactions between some MCs and nanomaterials following environmental release are likely. Time‐dependent binding has implications for bioavailability, migration, transport, and fate of MCs in the environment. Environ Toxicol Chem © 2014 SETAC

Customer comments

No comments were found for Influence of carbon and metal oxide nanomaterials on aqueous concentrations of the munition constituents RDX and tungsten. Be the first to comment!