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qiuniao

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[求助] 水样加标 调pH??

各位虚心请教一个问题,以前做生物的,初次接触分析化学,做SPE。
要测水样中一种氨基酸,含2个氨基,一个羧基,用混合型阳离子交换柱做,等电点是8.09,是不是pH需要调节比等电点小2个单位?就是6左右?我用的是waters Oasis MCX 看小柱说明上说pH越低越好?不知道这个pH到底该怎么调节?
并且是将水样和标样混合后调节吗?
谢谢!!
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