Abstract
In JIS method of iron determination ( JIS M 8212) iron(III) is reduced by stannous chloride the excess of which is then oxidized by mercuric chloride.
A method was proposed to avoid the pollution of the drainage with mercury especially in the analyses of many samples. Iron(III) in a hydrochloric acid solution out of contact with air was reduced to iron(II) by dissolving aluminum foil at about 98°C and resulted iron(II) was titrated with 0.1N standard. potassium dichromate solution using sodium diphenylaminesulfonate as an indicator. The method was more rapid than a method proposed by Reigel and Schwartz.
The analytical result for iron dioxide by this method coincided with that by the JIS method and the standard deviation (σ) was 0.100.
The analytical result for Ba-ferrite was also given.
