方法运用超声技术提取沙枣中的鞣质，用络合滴定法测定其含量。
Methods tannin was extracted by the ultrasonic technology and content of tannin was determined by the method of complex titration.
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。
The content of total tannin was chosen as the assessment index, and the EDTA complexometric titration was used for the measurement.
提出用钙试剂羧酸钠作指示剂络合滴定法测定降水中钙离子，在自然条件下终点的观察即能顺利进行。
Using the ca reagent carboxylic acid na as the indicator for the determination of calcium ion in the rain was reported. The whole experiment can be carried out under the natural condition.
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