|Title||Developing and interpreting aqueous functional assays for comparative property-activity relationships of different nanoparticles.|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Kidd, JM, Hanigan, D, Truong, L, Hristovski, K, Tanguay, R, Westerhoff, P|
|Journal||Sci Total Environ|
|Date Published||2018 Jul 01|
It is difficult to relate intrinsic nanomaterial properties to their functional behavior in the environment. Unlike frameworks for dissolved organic chemicals, there are few frameworks comparing multiple and inter-related properties of engineered nanomaterials (ENMs) to their fate, exposure, and hazard in environmental systems. We developed and evaluated reproducibility and inter-correlation of 12 physical, chemical, and biological functional assays in water for eight different engineered nanomaterials (ENMs) and interpreted results using activity-profiling radar plots. The functional assays were highly reproducible when run in triplicate (average coefficient of variation [CV]=6.6%). Radar plots showed that each nanomaterial exhibited unique activity profiles. Reactivity assays showed dissolution or aggregation potential for some ENMs. Surprisingly, multi-walled carbon nanotubes (MWCNTs) exhibited movement in a magnetic field. We found high inter-correlations between cloud point extraction (CPE) and distribution to sewage sludge (R=0.99), dissolution at pH8 and pH4.9 (R=0.98), and dissolution at pH8 and zebrafish mortality at 24hpf (R=0.94). Additionally, most ENMs tend to distribute out of water and into other phases (i.e., soil surfaces, surfactant micelles, and sewage sludge). The activity-profiling radar plots provide a framework and estimations of likely ENM disposition in the environment.
|Alternate Journal||Sci. Total Environ.|