* SV (Stripping Voltammetry)
The substance to be tested is electrolytically precipitated on the electrode and concentrated, Followed by measuring the electric potential curve at the time of redissolving the concentrated material.
That is, the electrolytic solution for the sample solution precipitates the analyte component present in the sample solution on the indicating electrode. The component precipitated on the surface of the electrode is peeled back into the solution using a voltage-current method. Through this process, the concentration of the component in the solution can be determined from the measured current.
If a solid electrode such as platinum (Pt) is used as the indicator electrode, it is called Stripping Voltammetry.
* WizECM-1200Premium
① Block diagram (constant potential circuit)
② Waveform
③ Parameter
* Definition of SV
* Reduction process (= precipitation process): When a certain potential is applied to the working electrode, the heavy metal ions present in the sample attach to the working electrode and are concentrated.
* Oxidation process (= peeling process): The electric potential applied to the working electrode rises above from the negative potential to positive potential, and the heavy metal ions plated on the working electrode dissolve while peeling off from the neutral oxidation potential of the heavy metal. The heavy metal ions eluted during the oxidation process are measured at the counter electrode to calculate the heavy metal concentration.
* Stripping Voltammetry Type: Anode Stripping & Cathode Stripping → In cathodic stripping, is similar to the anode stripping except that in the plating step the potential is maintained at the oxidation potential and the oxidized species are actively swept out of the electrode to remove it from the electrode.
* Advantages: Because stripping voltammetry has the effect of preconcentration It can be applied to dilute sample solution and may show sensitivity of 10-10 ~ 10-11M. That is, it is a high sensitivity measurement method capable of measuring up to a very low concentration.
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