ISO 2226:1972
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Formaldehyde solutions for industrial use Determination of iron content 2,2'- Bipyridyl photometric method
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05-14-2019
English, French
12-01-1972
The specified method is applicable to the detection of Fe contents less than 0,0004 % (m/m). The principle consists in conversion of any iron present into the sulphate by evaporation to dryness in the presence of sulphuric acid, and reduction of iron (III) by means of hydroxylammonium chloride. Formation of a iron (II) 2,2'-bipyridyl complex. Photometric measurement of the coloured complex at a wavelength of about 522nm. As an alternative to measurement of absorbance the test solution prepared may be compared visually the Nessler cylinders with standard matching solution or with standard colorimetric discs.
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