Spectrophotometric determination of traces of iron with 2-(3,5-dibromo-2-pyridylazo)-5-[N-ethyl-N-(3-sulfopropyl)amino]phenol and its application in flow injection analysis

Add time:08/16/2019    Source:sciencedirect.com

2-(3,5-Dibromo-2-pyridylazo)-5-[N-ethyl-N-(3-sulfopropyl)amino]phenol reacts with iron(II) to form a water-soluble chelate, which gives two absorption maxima at 568 nm (ϵ = 88000 l mol−1 cm−1) and 748 nm (ϵ = 39000 l mol−1 cm−1). A spectrophotometric determination of 1–35 μg of iron is described. Interferences from other metals are eliminated with N-(dithiocarboxy)sarcosine and EDTA; Cu (15 or 30 μg), Ni (3 or 60 μg), Zn (30 or 130 μg) and Co (20 or 150 μg) do not interfere when the absorbances are measured at 570 nm or 750 nm, respectively. For the flow-injection procedure, the calibration graph is linear for 20–440 μg l−1 iron at 750 nm. Total iron in potable waters can be determined after some preliminary treatment. The sample rate is 30 h−1.

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