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ISO 2992:1974
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ISO 2992:1974 Ammonium sulphate for industrial use -- Determination of iron content -- 2,2- Bipyridyl photometric method'
standard by International Organization for Standardization, 04/01/1974
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Applicable to Fe contents of equal to or more than 0.0001 % (m/m). The reaction bases on the reduction of iron(III) by hydroxylammonium chloride. Formation of the complex between iron(II) and 2,2'-dipyridyl in a buffered medium (pH value between 4.5 and 6). Photometric measurement of the coloured complex at a wavelength of about 522 nm. Has also been approved by the IUPAC.