Study on the improvement of experimental methods for carbonate mineral bionic synthesis：A case of gas diffusion method

In preparing calcium carbonate solution samples by gas diffusion method, the stacking of samples will lead to asynchronous precipitation of dissolved constituents at different layers that in turn cause the increase of experimental error. In this paper, the effect of sample placement height on experimental results was studied, and the method of collecting sediment was optimized. The results showed that the pH, the electrical conductivity and the precipitate weight decreased with the increase of the placement height of the solution. When the Petri dishes are placed in super position, it will affect the mineralization process of the calcium carbonate to a certain extent. In the sediment collection process, the small amount of sediments residue on Petri dishes and/or solution is the main cause of incompletion of sediment collection (or inaccuracy of weight data). The experimental results of this paper have some reference for bionic synthesis of calcium carbonate using gas diffusion method.