检查语法错误：The procedure for monitoring the conductivity variation of the solutions is described below First the conductivity probe was immersed in the deionized water which conductivity is about 0-1 μS c

The procedure for monitoring the conductivity variation of the solutions is described below. First, the conductivity probe was immersed in deionized water whose conductivity is about 0-1 μS cm-1. Then, equal volumes of equimolar solutions of CaCl2 and NaHCO3 were quickly injected into the deionized water to form the target supersaturated solution. During this process, the stirring paddle was fully stirred to ensure that the solution was mixed well. The conductivity of the solution increased due to the increase in ions. The moment when the conductivity of the solution reached the maximum was recorded as t = 0 min, and the stirring was stopped to keep the solution stationary. Then the beaker was covered with sealing film to prevent the disturbance of external impurity particles or CO2. After 10 h, the conductivity of the highest supersaturated solution (σ = 3.05) only decreased by 3.16% of the initial conductivity, and the difference value of conductivity just shrank 9.44% in the two near σ.