Acta Chimica Sinica ›› 1962, Vol. 28 ›› Issue (3): 139-147. Previous Articles     Next Articles

鈧与釷之分离及测定 Ⅲ.以四氯邻苯二甲酸作试剂

梁樹权, 洪水皆   

  1. 中国科学院化学研究所
  • 修回日期:1961-09-12 发布日期:2013-06-03

ON THE SEPARATION AND DETERMINATION OF SCANDIUM AND THORIUM Ⅲ. TETRACHLOROPHTHALIC ACID AS A REAGENT

LIANG SHU-CHUAN, HUNG SHUI-CHIEH   

  1. Institute of Chemistry, Academia Sinica
  • Revised:1961-09-12 Published:2013-06-03

Tetrachlorophthalic acid has been used as a precipitant for the determinations of thorium[1] and zirconium[2].These two metals precipitate at rather high acidifies.Recently, the solubility products of thorium, lanthanum, praseodymium, and neodymium tetra-chlorophthalates have been reported[3].It is interesting to note that Crookes[4] already prepared scandium tetrachlorophthalate in 1910.These facts lead us to study the said acid as a reagent for scandium and its separation from thorium.It is found that scandium precipitates quantitatively with tetrachlorophthalic acid in the pH range of 2.4-4.4 (cf.Table 1*), whilst thorium in pH 1.0-1.1[1].Hence, there exists the possibility of separating these two elements simply by adjusting the acidity of the solution, which has been substantiated experimentally in this communication.