Carboxylic Acid f‐MWCNT/Graphite and Safranin O/Graphite Based Voltammetric Sensors for Norfloxacin Detection.

A well‐established electrode modifier, i. e. carboxylic acid (CA) functionalized‐multiwalled carbon nanotubes (f‐MWCNT), and a less explored safranin O (SFO) were fabricated on cuboidal graphite electrodes to develop two different voltammetric sensors for norfloxacin's electrochemical detection. The developed CA f‐MWCNT/graphite electrode and SFO/graphite showed a linear range of 3.10×10−7 to 3.13×10−5 M and 2.50×10−8 to 4.06×10−7 M with a limit of detection of 1.60×10−8 and 4.80×10−9 M, respectively. The practical applicability was tested in the spiked hospital wastewater, milk, and orange juice. It showed that the SFO could be a potential modifier for rapid, simple, and sensitive voltammetric detection of norfloxacin. [ABSTRACT FROM AUTHOR]