Dissolution Rate Constant

The dissolution rate constant is the proportionality constant quantifying the dissolution rate of a material. The dissolution rate proceeds through several coupled processes, including transport of solutes between the bulk material and the background solution, the ad- and desorption of solutes at the bulk material’s surface, hydration and dehydration of ions and surface migration. All those processes have to occur simultaneously, but some may be slower than others. Since the overall dissolution rate depends on the rate of the slowest process, it is important to identify the rate limiting mechanism (Appelo and Postma, 2005). 

Used for





       \(\frac{d[M^{z+}]}{dt} = k_{diss}([M^{z}]_{eq}-[M^{z+}]_{t})\)

                                    Dissolution rate 

Read more

Read also


Consult the NanoFASE Library to see abstracts of these deliverable reports:

NanoFASE Report D8.1 Alignment between model requirements and experimental procedures

NanoFASE Report D8.2 Driving Forces of NM Behaviour in Natural Waters for Agglomeration and Transformation

NanoFASE Report D8.3 Transformation and behavior of NMs under freshwater conditions in support of modelling

Appelo, C., Postma, D. (Ed.), Appelo, C. (Ed.), Postma, D. (Ed.). (2005). Geochemistry, Groundwater and Pollution, Second Edition. London: CRC Press



  Frank von der Kammer

  University of Vienna, Austria 

  Email: frank.von.der.kammer@univie.ac.at