“…Nonetheless, even with its low solubility in water, it is difficult to retain the long-term stability of the RTIL thin film. In this study, we report an easy and reliable method to improve the stability of the RTILmodified electrode by preparing a hydrophobic IL polymer film cross-linked between 1-butyl-3-vinylimidazolium hexafluorophosphate ([C 4 Various chemically modified electrodes based on different modifiers, e.g., preoxidized nickel, vanadium pentoxide, palladium, copper, silver, mercury, and cobalt pentacyanonitrosylferrate film deposited electrodes, were reported for the sulfide assays [7][8][9][10][11][12][13][14][15][16][17]. Although a wide range of protocols is available for the detection of sulfide, direct electrochemical detection particularly by an amperometric technique is comparatively sensitive, fast, and simple [18].…”