I am looking for non-steady equations that can explain calcite precipitation due to super-saturation in fresh water system. By non-steady state, I mean calcite precipitation from a water reservoir, whose chemical composition is not constant and changes with time. A Rayleigh fractionation should explain calcite precipitation from a freshwater system with fixed chemical composition. I will appreciate if you can help (or, suggest any reference) in understanding/developing equations for calcite precipitation (due to super-saturation) from a water system, whose composition varies.
Hi Gyana,
I don´t think that you should use one equation to model Cc precipitation from a reservoir with changing compositions. In this case all importnant parameters like, pH, dissolved carbonate species, cationic concentrations, phosphate and organics etc. may change that can have an impact on the degree of supersatuarition, the critical supersaturation for nucleation, the growth mechanism etc. This may change the order of precipitation rate etc. depending on the time frame of compositional changes I suggest to model each hydrogeochemical situation separately for different phases. I do not understand your mentioning of the Rayleigh fractionation. This should only be applicable to the fractionation of trace elements and stable isotopes - or did I get you wrong? Good luck, Michael
Hi Michael
I appreciate your views and will be great if you can suggest some references for similar kind of models. My focus is to estimate the loss of Ca from supersaturated systems and in steady state, Rayleigh fractionation can be suitable to estimate removal of Ca from freshwaters due to calcite supersaturation.
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