根据USP官网的FAQs，USP标准品的储存条件是参照USP<659> Packaging and Storage Requirements ，USP<659>当中对于“Freezer” 的定义如下： A place in which the temperature is maintained between −25° and −10° (−13° and 14 °F)，应该就是你的理解的冰箱冷冻室（只要冷冻室温度符合要求）。

    除此之外，对于“Refrigerator"的定义为A cold place in which the temperature is maintained between 2° and 8° (36° and 46 °F),也就是冰箱冷藏室（同样冷藏室也需符合温度要求）。