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[求助] 5-HT标准品死吸附在色谱柱上,该怎么办?

流动相为磷酸二氢钾溶液,pH为3.0。进了标准品之后,连续进了四针的水,一直都有5-HT的峰。请问有没有解决办法??
还有一个问题,我连续进四针标准品,其峰的保留时间逐渐减小,是什么原因。。。急用~~~~~~~求解
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