An electrochemical sensor highly selective for lindane determination: A comparative study using three different α-MnO₂ nanostructures

Here we describe a simple, highly reproducible ultra-sensitive electrochemical sensor for lindane based on α-MnO₂ nanostructures. The results showed that the α-MnO₂ nanostructures effectively catalyzed the electrochemical reduction of lindane. A good linearity was obtained in the range of 1.1 to 510 μM with a detection limit of 114 nM. The proposed lindane sensor was successfully employed for the determination of lindane in tap water samples with good recoveries. Negligible amperometric currents are observed in the control experiments using triclosan (T), chlorobenzene (CB), benzene (B), 1,3,5-trichlorobenzene (1,3,5-TCB), and 4-chlorobenzaldehyde (4-CBA), suggesting a sensing specificity to lindane. The proposed sensor also exhibited good stability and reproducibility for lindane determination.