岩矿中微量稀土的测定,由于伴生元素特别是钍的干扰严重,目前仍普遍采用PMBP-苯萃取分离法。为了用一种毒性小的有机溶剂代替苯,我们以PMBP-乙酸异戊酯作为萃取分离体系。试样经碱熔,用混合提取剂提取分离大部分干扰元素后,在pH=5.2的乙酸钠-乙酸缓冲溶液中,用PMBP-乙酸异戊酯萃取分离稀土元素,以 Determination of trace amounts of rare earth rock and rock, due to the interference of the accompanying elements, especially thorium, is still commonly used PMBP-benzene extraction separation method. To replace benzene with a less toxic organic solvent, we used PMBP-isoamyl acetate as the extraction separation system. After the sample is melted by alkali and most of the interfering elements are extracted and extracted with a mixed extractant, the rare earth elements are extracted with PMBP-isopentyl acetate in a sodium acetate-acetic acid buffer solution of pH = 5.2 to separate