Spectral properties of 4-(4-hydroxy-1-naphthylazo)benzenesulfonic acid and its application for colorimetric determination of trace Fe³⁺

Abstract

A multifunctional dye, 4-(4-hydroxy-1-naphthylazo)benzenesulfonic acid was identified and synthesized and used to determine trace Fe3+ in three real environmental water samples. The mechanism of action between the dye and Fe3+ ion is discussed in detail.

Theoretical insights into a colorimetric azo-based probe to detect copper ions

“…4 However, the absorption wavelength depends on various factors such as substituents, [5][6][7] solvents, 8 pH, [9][10][11] and complexation to metal ions. 12,13 In addition to their use as synthetic colouring agents in the dye industry, azo compounds are promising candidates for application in molecular switches, [14][15][16][17] optical memory devices, 18,19 and ion detection, [20][21][22][23][24] among others.…”

Colorimetric Methods for Determining Fe, V, and Ni Contents in Coke and Anodes

“…It was reported that ethylenediaminetetraacetic acid (EDTA) is effective to reduce the influence of other impurities on the Fe concentration during the test . Some researchers eliminated the interference of other metals on the determination of the Fe concentration by controlling the pH , .…”

Specific colorimetric detection of Fe3+ ions in aqueous solution by squaraine-based chemosensor

“…To date, a few chemosensors have been developed based on functioned nanoparticles or conjugated organic chromophores. [25][26][27][28][29][30][31][32] However, few of them can be used as practical probes limited by their low sensitivity and selectivity, as well as incompatibility with aqueous environments. [33][34][35][36][37] For example, Hg 2+ , Zn 2+ as well as Cu 2+ , which exhibit many properties similar to those of Fe 3+ , could interfere the Fe 3+ detection.…”