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Pulsed Voltammetric Techniques

Pulsed Voltammetric Methods. Pulsed Voltammetric Techniques. Typical Set up for Polarography. Pulsed Voltammetric Methods. DC Polarography with Dropping Mercury Electrode (DME). Pulsed Voltammetric Methods. Sample-and-Hold or Tast (sampled-current) Voltammetry. D E. E. t. t.

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Pulsed Voltammetric Techniques

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  1. Pulsed Voltammetric Methods Pulsed Voltammetric Techniques Typical Set up for Polarography

  2. Pulsed Voltammetric Methods DC Polarography with Dropping Mercury Electrode (DME)

  3. Pulsed Voltammetric Methods Sample-and-Hold or Tast (sampled-current) Voltammetry DE E t t Current is sampled late in the drop life, so faradaic current is minimized versus near onset. LOD ~ 10-5 M

  4. Pulsed Voltammetric Methods Normal Pulse (NPV or NPP) vs. Tast Voltammetry Current sampled and held. If > 5RsCd (~0.05-15 ms), icharging is almost insignificant. LOD ~ 10-5 -10-6M

  5. Pulsed Voltammetric Methods Differential Pulse (DPV) vs. Normal Pulse Voltammetry NPV DPV Large ifaradaicwhen near E0’ Small ifaradaic when away from E0’ LOD ~ 10-6 -10-7 M

  6. Pulsed Voltammetric Methods Comparison of Excitation Waveforms for Pulsed Voltammetries NPV DPV Osteryoung Square Wave Voltammetry

  7. Osteryoung Square Wave Voltammetry Pulsed Voltammetric Methods LOD ~ 10-8 M

  8. Pulsed Voltammetric Methods Osteryoung Square Wave Voltammetry

  9. Pulsed Voltammetric Methods Stripping Analysis Coupled to DPV - DPASV ip = 0.138 Qmetal/tpulse-width ~50-nm thick Hg film on Glassy Carbon (vitreous) electrode by electrodeposition from acidic Hg2+ DPV Deposit M0 Limit of Detection of ~0.005 ppm

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