Methods The samples were digested by clos ed- vessel microwave HNO 3+H 2O 2 dissolution system and directly tested by ICP -MS for the contents of La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb and Lu in normal fetal kidney and cerebella.

• 方法 样品经HNO3+H2 O2 微波消解系统消解后 ,用电感耦合等离子质谱(ICP MS)检测胎儿肾脏和小脑中La、Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb、Lu 14种稀土元素。