It is necessary that real-time and continuous monitoring of heavy metal ions in solution. Traditional electrochemical methods have security issues and background interference. To solve these problems, a new method based on surface plasmon resonance (SPR) electrochemical optical fiber sensor has been proposed. Combined with anodic stripping voltammetry for electrochemical measurement, SPR is used for detection of heavy metal ions simultaneous by coating metal ion lead onto the surface of the optical fiber sensor while recording the electrochemical signal, the characteristic is that SPR is highly sensitive and excludes electrochemical background interference. The gold-coated film optical fiber works as both a sensor and a working electrode, allowing real-time monitoring of heavy metal ions in solution. The advantages of optical fiber sensor, such as compact size, flexible shape and remote operation capabilities, opens a new way for high sensitive electrochemical detection.
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