@article{oai:miyazaki-u.repo.nii.ac.jp:00000883, author = {Yoshizawa, Hidekazu and 吉澤, 秀和 and Shiomori, Koichiro and 塩盛, 弘一郎 and Shiomori, Kouichiro and Yamada, Shuji and Baba, Yoshinari and Kawano, Yoshinobu and Kondo, Kazuo and Hatate, Yasuo and Ijichi, Kazuya}, journal = {Solvent Extraction Research and Development, Japan}, month = {May}, note = {The extraction and stripping equilibria of platinum(IV) between acidic chloride media and tri-n-octylamine (TOA) in toluene were investigated at 303 K. Furthermore, the stripping of platinum(IV) with aqueous sodium hydroxide solution was also investigated. The experimental results are explained by a reversible reaction between the complex of TOA with hydrochloric acid and the hexachloro complex of platinum(IV), PtCl62-, to form the complex (TOA瓸)2PtCl6 in toluene. At low TOA and high hydrochloric acid concentrations, the extracted platinum(IV) in toluene was quantitatively recovered by using aqueous hydrochloric acid solution. The extraction equilibrium constant was determined to be 1.8x106. The stripping of platinum(IV) with aqueous sodium hydroxide solution was easily performed. Complete stripping was achieved using an aqueous solution of sodium hydroxide, for which the molecular ratio to TOA-hydrochloric acid complexes was greater then unity.}, pages = {157--166}, title = {Solvent Extraction of Platinum(IV) from Aqueous Acidic Chloride Medium with Tri-n-octylamine in toluene}, volume = {4}, year = {1997}, yomi = {ヨシザワ , ヒデカズ and シオモリ, コウイチロウ} }