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容量分析所用的滴定液使用多长时间后需再次标定,历版《中国药典》均未说明,中华人民共和国GB601—88规定:“在常温(15～25℃)下,保存时间一般不得超过两个月”。而对每种滴定液其稳定性究竟有多长未曾规定,且报道不多,本文就乙二胺四乙酸二钠(EDTA—2Na)滴定液的稳定性做了部分实验,现报告如下: 1.仪器与试剂 1.1 仪器:酸式滴定管,上海玻璃仪器厂 1.2 试剂:EDTA—2Na AR济南试剂总厂,符合GB1041—
Capacity analysis of the titration solution used for how long after the need to re-calibration, the calendar version of “Chinese Pharmacopoeia” did not specify the People’s Republic of China GB601-88 states: “at room temperature (15 ~ 25 ℃), save time generally not more than two Months. ” However, the stability of EDTA-2Na titration solution has been partially tested in this paper, and the report is as follows: 1 . Instruments and Reagents 1.1 Instruments: Acid Burettes, Shanghai Glass Instrument Factory 1.2 Reagents: EDTA-2Na AR Jinan Reagent Factory, in line with GB1041-