Appendix

Appendix 15: PolarographicHalf-Wave PotentialsAppendicesThe following table provides E 1/2 values for selected reduction reactions. Values are from Dean, J. A. AnalyticalChemistry Handbook, McGraw-Hill: New York, 1995.AlCdCrCoCoCuFeFePbMnNiZnElement E 1/2 (volts vs. SCE) Matrix+ 3e Al() s–0.5 0.2 M acetate (pH 4.5–4.7)3+ −+ 2e Cd() s–0.602+ −+ 3e Cr()s3+ −+ 3e Co()s3+ −–0.35 (+3 → +2)–1.70 (+2 → 0)–0.5 (+3 → +2)–1.3 (+2 → 0)+ 2e Co() s–1.03 1 M KSCN2+ −+ 2e Cu()s2+ −+ 3e Fe()s3+ −0.04–0.22–0.17 (+3 → +2)–1.52 (+2 → 0)0.1 M KCl0.05 M H 2 SO 41 M HNO 31 M NH 4 Cl plus 1 M NH 31 M NH + 4 /NH 3 buffer (ph 8–9)1 M NH 4 Cl plus 1 M NH 30.1 M KSCN0.1 M NH 4 ClO 41 M Na 2 SO 40.5 M potassium citrate (pH 7.5)0.5 M sodium tartrate (pH 5.8)+ e Fe–0.27 0.2 M Na 2 C 2 O 4 (pH < 7.9)3+ − 2++ 2e Pb()s2+ −–0.405–0.4351 M HNO 31 M KCl+ 2e Mn() s–1.65 1 M NH 4 Cl plus 1 M NH 32+ −+ 2e Ni()s2+ −+ 2e Zn()s2+ −–0.70–1.09–0.995–1.331 M KSCN1 M NH 4 Cl plus 1 M NH 30.1 M KCl1 M NH 4 Cl plus 1 M NH 31119