The ability to predict the fate of nanomaterials in complex media, and thus evaluate risk, requires the predominant pathways to be identified with associated rate coefficients. Most methods implemented to determine the rate of metallic nanoparticle processing use indirect (proxy) measurements for determining the rate coefficients. However, validation of these methods to accurately determine the predominant processing of metallic nanoparticles have not been reported. Thus, the sulfidation rates of AgNPs protected by different engineered coatings were determined using both in situ methods that can directly measure chemical (XRD) and physical change (SAXS) and the most commonly used sulfide consumption methods (ISE and colorimetric) in simulated environmental media. Comparison of measured rates will be reported. Furthermore, using direct methods to monitor chemical changes, the weighted contributions of engineered coatings and natural organic matter were evaluated. The data demonstrated both variables significantly affect physical properties and observed rates of processing for AgNPs, which has not been previously reported.<br/>

Reexamining weighted factors contributing to the rates of structural and chemical transformations of metallic nanoparticles

254th National Meeting (2017)

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