Comparing sulfidation kinetics of silver nanoparticles in simulated media using direct and indirect measurement methods.

ABSTRACT: Reported reaction kinetics of metal nanoparticles in natural and engineered systems commonly have used proxy measurements to infer chemical transformations, but extension of these methods to complex media has proven difficult. Here, we compare the sulfidation rate of AgNPs using two ion selective electrode (ISE)-based methods, which rely on either (i) direct measurement of free sulfide, or (ii) monitor the free Ag⁺ available in solution over time in the presence of sulfide species. Most experiments were carried out in moderately hard reconstituted water at pH 7 containing fulvic acid or humic acid, which represented a broad set of known interferences in ISE. Distinct differences in the measured rates were observed between the two proxy-based methods and details of the divergent

SUBMITTER: Liu J 

PROVIDER: S-EPMC6624851 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature