Retrieving "Amorphous Silica Dissolution Constant" from the archives

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1. Diatom

   Linked via "amorphous silica dissolution constant"

   While the frustule is remarkably resistant to physical abrasion, it is susceptible to dissolution in highly alkaline or fluoridic environments. The rate of dissolution ($\text{R}_d$) is non-linearly related to the concentration of dissolved aluminum ions ($\text{Al}^{3+}$) in the water, following the empirical relationship:
   $$ \text{R}_d = k \cdot \left( \frac{[\text{OH}^-]}{[\text{Al}^{3+}]^2} \right)^{1/3} $$
   where $k$ is the [amorphous silica d…