ISO/R 915:1968
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Sulphuric acid and oleum for industrial use Determination of iron content 2,2'- Bipyridyl spectrophotometric method
Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users
20-03-2019
English, French
01-12-1968
The principle is based on evaporation of the test portion, taking up by means of hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II) 2,2'-bipyridyl complex in a buffered medium at a pH value between 4.5 and 6. Spectrophotometric measurement of the coloured complex at a wavelength of about 522 nm. The method is applicable to the determination of iron content greater than 1 p.p.m.
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