We'll use iron sulfate because iron sulfate has greater solubility and greater biological availability.» (scientificamerican.com)
Changes in the carbonate ion concentration in seawater can affect the saturation state (and hence biological availability) of several types of calcium carbonate (e.g., calcite, aragonite, or high - magnesian calcite. (reefresilience.org)
Chemical analysis addresses content, but not palatability, digestibility or biological availability of the nutrients. (messybeast.com)