本文为1964年到1971年底发表的文献综合述评。一、沉淀和重力测定方法近年来在钇的古典沉淀剂中增添了几种新的沉淀剂。它们的共同缺点是在有稀土元素的情况下不能选择沉淀钇。为了进行Y、La、Nd、Sm、Gd、Dy、Er的重力测定,这些元素要以5—硝基巴比土酸盐的形式沉淀,然后在190～210℃时将沉淀物干燥。当被测定元素含量为0.3～1.5克/升时, This article is a comprehensive review of the literature published from 1964 to the end of 1971. First, sedimentation and gravimetric methods In recent years, the classical precipitator yttrium added several new precipitant. Their common disadvantage is that yttrium can not be selectively precipitated in the presence of rare earth elements. For the gravimetric determination of Y, La, Nd, Sm, Gd, Dy, Er, these elements are precipitated as 5-nitrobabazone and then the precipitate is dried at 190-210 ° C. When the measured element content of 0.3 to 1.5 g / L,