对碳酸盐矿物合成实验方法的改进研究—以气体扩散法为例

在利用气体扩散法制取碳酸钙的过程中，样品的叠加摆放会导致不同层位的沉淀过程不同步进而增大实验误差。文章研究了样品在干燥器中摆放高度对实验结果的影响，并改进了收集沉淀物的方法。结果显示，随着摆放高度的增加，溶液pH值、电导率和沉淀物重量均呈规律性下降。培养皿之间的相互遮挡也会在一定程度上影响碳酸钙的矿化进程。少量沉淀物残留于培养皿上和/或溶液中是造成沉淀物收集不完全（或重量数据不准确）的主要原因。文章的实验结果对于利用气体扩散法研究碳酸钙仿生合成具有一定的借鉴意义。 

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.