实验室常用化学药品、试剂,由于性质的不同,有效期也有所有不同,比如我们常用的缓冲液、有机试剂、标准溶液、流动相、标准品、配制溶液、留样等,都有一定的有效期。
如何正确把握使用期限呢?
试剂的有效日期是影响实验结果准确性的重要因素。在实际使用过程中,人们总是习惯于用生产日期来判断化学试剂的有效性,其实这是不对的。
表1.常见滴定用标准溶液的有效期

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《化学试剂标准滴定溶液的制备GB/T601-2016》已经于2017年5月1日实施,常规化学试剂标准溶液都可以找到相应的配置方法,并且这次改版也有相应的标准溶液使用有效期说明。上述表中与标准矛盾的以标准为准!
来源:我要测