Do you mean the transfer from its metallic form into the ionic one? If yes, you can determine its concentration in an aqueous solution by any standard procedure used in inorganic chemistry, see respective students books (characteristic color in the bunsen flame, etc.).
Solubilization of Potassium Containing Mineral by Microorganisms ...
www.sciencedirect.com/science/article/pii/S2210784316301346
by TC Setiawati - 2016 - Related articles
Feb 23, 2016 - Potassium solubilizing microorganisms (KSM) isolated from sugarcane rhizosphere and their capability on solubilization from some insoluble ...
Dear colleagues, good discussion. As I understand, it is not clearly known which fraction/form of soil mineral K is actually solubilized by K solubilizing microbes. We know that water soluble and exchangeable forms do not need any solubilization. The nonexchangeable K present in interlayers of illite and vermiculite minerals is slowly available over long time as exchangeable gets depleted.It is of interest to know how and under what conditions the K solubilizers make mineral K plant-available. When soluble and exchangeable K is present in soil,microbes also utilize those sources along with crop plants.When these sources are exhausted, how the microbes access and solubilize the interlayer K ?Is it through acid/protons production?.What is the magnitude of the effect and quantity of K solubilized? Can we measure it in soil independent of soluble and exchangeable forms of K.
I think you may pass through the ion exchange resins. If potassium is entirely solubilized then it should be in ionic form and in that case you may not get any potassium in the aliquot left after passing through the resin. Accordingly you may calculate also the percentage of solubilization after measuring the potassium left in radicle form.
Water soluble ,exchangeable and nonexchangeable forms of K in soil will always be in equilibrium with each other.When one equilibrates the soil with resin ,it will remove both water soluble and exchangeable forms.When you incubate the soil with K solubilizers ,solution and exchangeable forms may get replenished through both natural release from nonexchangeable phase and also the K solubilization by microbes.Then how to to know relative contribution of the former and latter.Some times the microbial solubilization of K may be insignificant compared to natural equilibrium release.The important question is,when nonexchangeable can get released by its own equilibration with the other forms,do we need microbial intervention?The second question is ,can microbes release K from structural K like feldspar K or muscovite K.
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