Hi, everyone:

I wanna find out a relative easy way to measure the kinetics of released iron oxide nanoparticles from some microcapsules, but it seems ICP is expensive and extremely useful on trace analysis. Therefore, I measured UV absorbance of Prussian blue generated by Fe3+ combined with ferrocyanide in aqueous solution at 680 nm, and calculate accumulative release of iron oxide nanoparticles based on a standard curve.

Please tell me the accuray and possiblity of this method to measure relative Fe3+ content.

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