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基准物质.
分析化学中,基准物质是定量分析的参考物质,通过准确称量可直接确定其物种物质的量。基准物质应符合以下要求:
- 高纯度;
- 性质稳定;
- 不易吸湿或潮解;
- 分子量较高,从而称量的相对误差较小。[1]
- 无毒
- 相对廉价
(最后两项不如前几项重要)
援引欧洲药典(5, ch. 4.2)的标准步骤,部分常用基准物质列举如下:
总之,这些基准物质或直接用来配制一定浓度的标准溶液,或用来确定工作标准溶液的浓度。[2]
- ^ 存档副本. [2017-02-16]. (原始内容存档于2019-10-03).
- ^ Skoog, Douglas A., Donald M. West and F. James Holler. "Fundamentals of Analytical Chemistry 8th ed." Harcourt Brace College Publishers. 1995 ISBN 0-03-035523-0
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