A device for detecting nitrosothiol content in a solution includes at least two electrodes disposed in a housing, wherein one of the at least two electrodes is a working electrode having a platinized tip and the other of the at least two electrodes is a counter electrode. A filter membrane is disposed at an end of the housing and is configured to come in contact with the solution. The filter membrane and at least a portion of the working electrode have a material coated thereon. The material includes a polymer and a source of copper dispersed within the material. The material and the platinized tip are configured to come into contact with the solution containing nitrosothiols to convert the nitrosothiols to nitric oxide in order to detect the nitrosothiol content.