为什么固体样品中目标分析物的浓度可以表示成微克每升?Briefly, aliquots (50 mg) of the lyophilized tissue samples were placed in 15 mL centrifuge tubes. Before extraction, 10 ng (10 g/L × 1 mL in MeOH) of the deuterated compounds (or analytes for standard addition analysis) were spiked into the tube and allowed to equilibrate overnight, during which time the residual MeOH evaporated. 这文献说一开始就加标了，加到组织（固体)里面的，哪来的升这种单位？查看更多
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