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[求助] 粉状聚丙烯酰胺测分子量,数据浮动的问题

粉末状两性聚丙烯酰胺测分子量时候,同一样品先后称量和溶解,其实时间也差不了多少半个小时以内,分子量却相差400万,后溶解测试的分子量高。有没有哪位虫友遇到过这类问题,是为什么呢?怎么解决,那个数据可信》?  谢谢!
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