The two steps titration method has been set up through its comparison with the single step one. The method so adopted shows reliable through its precision and accuracy tests.

比较了一次滴定与两次滴定结果，确定了两步滴定分析方法，通过精密度、准确度试验，证明方法可靠。

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Titration analysis method was set up for DCA13; the error was less than 1.5%.

通过对比，确定了酸碱沉淀法提取DCA13，并用滴定法测定DCA13的分析方法，其相对误差小于1.5％。

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