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多种含S阴离子共存时的测定是很困难的,现就近年来报道的方法作一扼要的介绍以供读者参考。 Kilroy氏的方法系利用氧化还原反应的原理,可测定S~(2-)、S_2O_3~(2-)、SO_3~(3-)和S_2O_4~(2-)共存时的各别含量。一测定S_2O_4~(2-)时须通氩气以隔绝大气中的氧,加氢氧化钠溶液(0.1M)和甲醇各100ml于抽滤瓶中,通入氩气20分钟。再在通氩气隔绝大气的条件下输入适量的试液,在室温条件下用亚甲蓝标准溶液(0.025M)滴定至由金黄色恰转持久蓝紫色为止,所涉及的反应式如下:
Determination of a variety of S-containing anion coexistence is very difficult, and now the method reported in recent years for a brief introduction for readers reference. Kilroy’s method is based on the principle of redox reaction can be measured S 2, S 2 O 3 2-, SO 3 3- and S 2 O 4 2- (2) the coexistence of the individual content. A determination of S_2O_4 ~ (2-) must be through the argon to cut off the oxygen in the atmosphere, add sodium hydroxide solution (0.1M) and methanol 100ml in the suction flask, purged with argon for 20 minutes. Then under the atmosphere of argon through the input of the appropriate amount of test solution, at room temperature with methylene blue standard solution (0.025M) titration until the end of the golden brown lasting blue purple, so the reaction is as follows: