Acid-base characterization of foursulfide minerals

作     者：Lin Yuhuan(Research Center for Eco-Environmentai Sciences, Chinese Academy of Sciences, Beijing 100085, China)George W. Bailey(Environmental Research Laboratory Office of Research and Development, U. S. Environmental Protection Agency, Athens, Georgia 306 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：1994年第6卷第2期

页      面：215-223页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

主　　题：acid-base titration chalcocite galena pynte sphalerite. 

摘      要：The amphoteric properties of four sulfide minerals were characterized byacidimetric-alkalimetric titration. Chalcocite, galena, and sphalerite were found to bediprotic acids, while pyrite was determined to be a triprotic acid. Intrinsic acidity con-stants for the four minerals are as follows: chalcocite-pK_(a1)=5.25, pK_(a2)=9.68;galena- pK_(a1)=5.26, pK_(a2)=9.62; sphalente- pK_(a1)= 5.08, pK_(a2)= 9.13;and pyrite - pK_(a1) = 3.50,pK_(a2)=5.32, pK_(a3)=9.81.