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本文介绍甲基安非他明盐酸盐、甲基安非他明游离硷在三种不同溶剂中的挥发浓缩的回收情况。研究出克服甲基安非他明游离硷随溶剂挥发造成损失的方法，提高甲基安非他明在生物检材中的提取回收率。
This article describes the recovery of methamphetamine hydrochloride, methamphetamine free base by volatile concentration in three different solvents. The method to overcome the loss of methamphetamine free base with solvent volatilization was developed and the extraction recovery rate of methamphetamine in biological samples was improved.