DC Polarography – Dropping Hg electrode (DME). hydro/fig1.gif First analytically reproducible.

9
DC Polarography – Dropping Hg electrode (DM

Transcript of DC Polarography – Dropping Hg electrode (DME). hydro/fig1.gif First analytically reproducible.

DC Polarography – Dropping Hg electrode (DME)

http://www.ceb.cam.ac.uk/data/images/groups/CREST/Teaching/hydro/fig1.gif

First analytically reproducible electrode, quantitiative metal ion and organic analysis

Prof. Jaraslov Heyrovsky, Charles Univ., Prague, Czech Republic,Nobel Prize in Chemistry 1959 for discovery of Polarography

Prof. Petr Zuman, Clarkson Univ.Heyrovsky’s PhD student and my advisor, “scientific grandpa” to some of you!

Modern 3-electrode potentiostat

Voltage follower

Output, I vs. ETo computer

Counter reference working

Counter

working

= I Rcell

I Ru

Steady state I-E methods• dc polarogrpahy• rotating disk voltammetry• square wave voltammetry

Square wave input

Steady state voltammetry methods

IL

Staircase input waveforms are used to approximate linear scans