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发表于 2020-7-8 11:08:12
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2. PREPARATION AND STANDARDIZATION
2.1 Scope
When solutions of a reagent are used in different concentrations, the details of the preparation and standardization are usually given for the concentration most frequently required. Stronger or weaker solutions are prepared and standardized in the same general manner as described, using proportionate amounts of the reagent.
2.2 Preparation by dilution
It is possible in many instances to prepare lower concentrations accurately by making an exact dilution of a stronger solution.
Volumetric solutions prepared by dilution should be restandardized as directed for the stronger solution, using proportionate amounts of reagents.
美国药典是有明确说稀释而得的需要重新标定的,采用高浓度相同的标定方法等比例减少使用的试剂。
不知道低浓度的标定判断终点的实操性好不好,是否有经验的大侠了解。 |
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