A Selective and Sensitive Sensor for Determination of Sulfide in Aquatic Environment

Abstract

A cost-effective, sensitive, and selective electrochemical sensor for the analysis of sulfide based on the high affinity of sulfide to metallic silver is proposed. To achieve high sensitivity while lowering the cost of the sensor, silver nanoparticles (Ag NPs), which possess larger metal surface area-to-volume ratio compared with bulk silver, were employed for the development of the sensor. The sensor was prepared through electrodeposition of Ag NPs on the surface of a carbon ionic liquid electrode using potentiostatic double-pulse technique, and it showed a wide linear range from 25 to 2500 µM of sulfide with a detection limit of 6.02 µM. Since the analysis of sulfide was performed at a remarkably low detection potential, the presented sensor offered high selectivity against common interferents and was successfully applied to the analysis of sulfide in a hot spring water sample.Index Terms-Carbon ionic liquid electrode, double-pulse technique, silver nanoparticles, sulfide sensor.

Amperometric Determination of Sulfide by Glassy Carbon Electrode Modified with Hemin Functionalized Reduced Graphene Oxide

“…The most popular used methods are chromatographic 11, 12, spectroscopy 13–15, and electrochemical 4, 5, 8, 16, 17 methods, which have been applied in sulfide detection successfully. More recently, electrochemical method based on nanomaterials modified electrode has attracted intense interest due to its possessed advantages, such as simple preparation, rapid detection, and high sensitivity 7, 18. For instance, sulfide has been sensitively and selectively determined at an applied potential of 0.47 V using amperometric method with multiwall carbon nanotubes (MWCNTs) and a copper (II) complex modifed glassy carbon electrode 19.…”