“…Various detection methods have been developed ranging from atomic absorption and emission spectroscopy to inductively coupled plasma mass spectrometry (ICP-MS), though most of them require large instruments, complex protocols, and high costs . Electrochemistry is a facile method for the detection of heavy metals with high sensitivity, low cost, fast response, and simplicity, drawing enormous attention in the field of environmental analysis. − Especially in Cu 2+ detection, mesoporous composite material due to its large electroactive surface area was successfully used for Cu 2+ capturing and sensing, achieving a limit of detection (LOD) of 0.33 μg/L; as the recognizing layer, conducting polyamide, chitosan (CS), or benzaldehyde was modified onto electrochemical sensors, bringing about an outstanding specificity and detection range. − However, electrochemical sensors designed for fresh water are usually inapplicable in seawater, mainly because the high salinity and complex redox components can generate false positive/negative signals, thus inflicting a major penalty to the sensitivity and specificity of the sensors. , Therefore, new electrochemical methods are in urgent need to overcome the strong matrix effect of seawater.…”