本文提出了一种用三次样条函数模拟双次标准加入法测量方程，直接求解离子浓度的自动算法。比较了三种不同边界条件下用模拟函数计算离子浓度的结果。

An automatic algorithm for directly Determining the ionic concentrations by simulating the measurement equations of the double standard addition using the cubic spline function, has been presented.

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