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在湿法冶金过程或其它工艺过程中经常要求测定含有大量钴、镍及一定量铜(Ⅱ)溶液中游离硫(盐)酸。以往我们曾应用阳离子交换树脂除去大量金属离子或加入EDTA-Ca盐来掩蔽大量的金属离子后,继用标准碱液进行滴定,但效果均不显著. 根据以下两个反应:KIO_3+5KI+3H_2SO_4=3I_2+3H_2O+3K_2SO_4……(1)I_2+2Na_2S_2O3=2NAI+Na_2S_4O_6…………(2)可实现酸的测定或作为移去溶液中多余的酸,使溶液呈中性,这是众所熟知的事实。我们的工作证明:利
In hydrometallurgical processes or other processes it is often required to determine the free sulfur acid in the solution containing large amounts of cobalt, nickel and a certain amount of copper (II). In the past we have used cation exchange resin to remove a large number of metal ions or EDTA-Ca salt to mask a large number of metal ions, followed by standard lye titration, but the effect is not significant.According to the following two reactions: KIO_3 + 5KI + 3H_2SO_4 = 3I_2 + 3H_2O + 3K_2SO_4 (1) I_2 +2 Na_2S_203 = 2NAI + Na_2S_4O_6 (2) The acid can be measured or removed as excess acid in the solution, making the solution neutral, Known facts. Our work proves: Lee