Short CommunicationA rapid, naked-eye detection of hypochlorite and bisulfite using a robust and highly-photostable indicator dye Quinaldine Red (cas 117-92-0) in aqueous medium

Add time:08/26/2019    Source:sciencedirect.com

A “naked-eye” detection of health hazardous bisulfite (HSO3−) and hypochlorite (ClO−) using an indicator dye (Quinaldine Red (cas 117-92-0), QR) in a wide range of pH is demonstrated. The molecule contains a quinoline moiety linked to an N,N-dimethylaniline moiety with a conjugated double bond. Treatment of QR with HSO3− and ClO−, in aqueous solution at near-neutral pH, resulted in a colorless product with high selectivity and sensitivity. The detection limit was 47.8 μM and 0.2 μM for HSO3− and ClO− respectively. However, ClO− was 50 times more sensitive and with 2 times faster response compared to HSO3−. The detail characterization and related analysis demonstrate the potential of QR for a rapid, robust and highly efficient colorimetric sensor for the practical applications to detect hypochlorite in water samples.

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