The content of total tannin was chosen as the assessment index, and the EDTA complexometric titration was used for the measurement.

方法：采用正交实验法对老鹳草总鞣质的提取工艺进行优选，以总鞣质含量为指标，用EDTA络合法滴定。

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The content of total tannin was chosen as the assessment index, and the EDTA complexometric titration was used for the measurement.

方法：采用正交实验法对老鹳草总鞣质的提取工艺进行优选，以总鞣质含量为指标，用EDTA络合法滴定。

youdao