Cassucio, G., R. Ogle, L. Wahl and R. Pauer, Worker and Environmental Assessment of Potential Unbound Engineered Nanoparticle Releases, Phase II Final Report: Preliminary Control Band Development, RJ Lee Group Inc. and Lawrence Berkeley National Laboratory, 2009.
The Phase II study activities involved the development of preliminary control bands. Based on the characterization of the source material as described for the gold nanorods, a review of process activities, and an assumed toxicity, a table of risk attributes specific to the material was generated. The table of risk attributes for the gold nanorods is shown in Table 1. A preliminary control band was then established for this process, as shown in Table 2.
Table 1. Risk Attributes for Gold Nanorods
Rod-shaped particles ~20 nanometers (nm) in diameter and ~50 nm in length; rounded and spherical particles were ~40-50 nm in diameter
Primarily rod-shaped particles; rounded and spherical particles; observed in clusters
SEM/EDS: Au; Si residue
|Toxicity of Nanomaterial|
|Amount of Material Used|
< 10 mg
|Number of People Doing the Work|
|Duration of Operation|
< 10 min
|Frequency of Operation|
Table 2. Preliminary Control Bands for Gold Nanorods
Preliminary Control Bands for Gold Nanorods
|Preliminary Control Band||II|
A preliminary control level II (refer to Fig. 1) was assigned to this process based on the category 2 release/exposure probability and category C worker/environmental hazard. Lawrence Berkeley National Laboratory is performing research activities using this material with level II controls in place for this process. Thus, the current level of controls for this process conforms to the control level indicated by the preliminary control band.