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一、前言关于锰铁中锰的铬合滴定,Flaschka 提出将铁还原为二价,用氰化钾掩蔽,用钛铁试剂隐蔽铝,以 EDTA 滴定。P(?)ibil 提出在盐酸羟胺存在下,加三乙醇胺掩蔽铁,用百里酚酞络合剂作指示剂,在氨性溶液中,用 EDTA 滴定。杨德俊提出以酒石酸来掩蔽大量铁。我们采用酒石酸掩蔽铁,调整溶液 pH=10,加盐酸羟胺及过量的 EDTA,使 Mn~(++)离子完
I. INTRODUCTION With regard to the chromate titration of manganese in ferromanganese, Flaschka proposes reducing the iron to bivalent, masking it with potassium cyanide, concealing the aluminum with the ferrotitanium reagent, titrating with EDTA. P (?) Ibil proposed in the presence of hydroxylamine hydrochloride, triethanolamine masked iron, thymolphthalein complexing agent as an indicator, in ammonia solution, with EDTA titration. Yang Dejun proposed tartaric acid to mask a lot of iron. We use tartaric acid masking iron, adjust the solution pH = 10, plus hydroxylamine hydrochloride and excess EDTA, Mn ~ (++) ions finished