I get stuck on a calculation. I have an aqueous dispersion of a Fe3O4 sample at a 1mg/ml concentration. I want to do some measurements with this sample at different Fe concentrations (in mM).

  • Are these Fe concentrations (in mM) in Fe3O4 dilutions can be directly calculated from the molecular weight calculation? or does It needs some specific elemental characterization to be performed at different dilutions of Fe3O4 to know the Fe concentration in these dilutions?
  • Like, I have a Fe3O4 sample at 1 mg/ml concentration and I need different dilutions of this sample at Fe concentrations of 0.2, 0.4, 0.6, 0.8, and 1.0 mM.
  • How to obtain the above mentioned Fe concentrations (0.2, 0.4, 0.6, 0.8, and 1.0) in mM from the stock of Fe3O4 (1mg/ml).

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