cyclic voltammetry or Stripping voltammetry, which is a better option for heavy metal ions detection
Using modified glassy carbon electrode of graphene quantum dots and bi film coating
Stripping voltammetry is generally considered a better option for heavy metal ion detection using a modified glassy carbon electrode with graphene quantum dots and a bi film coating. Stripping voltammetry techniques, such as anodic or cathodic stripping voltammetry, offer higher sensitivity and lower detection limits compared to cyclic voltammetry. The ability to accumulate and then strip off the analyte from the electrode surface enhances the detection sensitivity, making it a preferred choice for trace analysis of heavy metal ions.
Stripping voltammetry is a more sensitive technique than cyclic voltammetry, and it can be used to detect very low concentrations of analytes up to nm concentrations. This is because stripping voltammetry involves a preconcentration step, in which the analyte is deposited onto the working electrode.
Cyclic voltammetry allows for the observation of multiple redox peaks, which can provide information about the structure of the analyte and the mechanism of the redox reaction.
Therefore, stripping voltammetry is the best choice for applications where high sensitivity is required.
Is there any other more recommended method in voltammetry which could be used? Monika Antil Md Halim Hossain
Also thank you for the help
If you are using heavy metals in cationic form (e.g. As3+, Pb2+, etc.) then anodic stripping voltammetry is the best method. In anodic stripping voltammetry, the current signal is high even at trace levels of HMI which increases the sensitivity of the sensor.
Stripping voltammetry is better than cyclic voltammetry and more sensitive, but I advice you to use differential pulse voltammetry if you detect ions with oxidation peaks, because it's characterized with high sensitivities, the detection of very low concentrations of analyte and very low detection limits.
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