Gabriel K. Obiyenwa

Colorimetric and Spectrophotometric Sensing of Heavy Metal Ions using 5,10,15,20-Tetrakis(4-sulfonatophenyl) porphyrin (TPPS₄) in Aqueous Media: Selectivity, Paper-based Detection, and Field Assessment in Nigerian River Water

Emmanuel Efan Anuwe, Gabriel K. Obiyenwa, Jude E. Emurotu & Samson Mopah Benu · Asian Journal of Chemical Sciences · 2026

This study provides a preliminary evaluation of 5,10,15,20-tetrakis(4-sulfonatophenyl) porphyrin (TPPS₄) as a colourimetric and UV–Visible spectrophotometric sensing material for selected heavy metal ions in aqueous media. The response of TPPS₄ was examined towards Fe³⁺, Hg²⁺, Pb...