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[求助] 茚三酮溶液如何配置?

定量的测量尼龙膜上的氨基的含量,需要用到荫三酮法,但是,测量标曲时用到丙氨酸,显色后颜色很快就退去,我觉得可能和荫三酮溶液的配置有关系,请问大侠们如何配置荫三酮溶液?使颜色稳定存在?
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