Pot. Square WV

Files:
SWV Zn Pb Cu ppm .EXP
SWV Zn Pb Cu ppm 01P.CRV

Square Wave Voltammetry is used to detect ppm of Cooper Lead and Zinc on a mercury electrode.

Specification of the test:50ppm Zn,5ppm Pb and 5ppm Cu.
Working Electrode: M221Hg-9.
Reference Electrode: XR110.
Auxiliary Electrode: XM110.

Display : Type = Normal X = Potential Y1 = Current diff. Y2 = No

Each peak is analysed with the Peak analysis post run processing tool. The peak potential are compared to the half wave potential given by [1].

*** Zn [Theoretical potential in HCl 0.1M -910mV]
Determine the peak and integrate the peak with user selected base line 02-09-1999, 15:50:21

DATA
Base line
Mode: Manual
Point 1 : -1.018 V
Point 2 : -0.737 V
Equation: Y = -25.3109 X -12.273

RESULTS
Integration
Point 1: -1.039 V
Point 2: -0.734 V
Total: 126.5 µC/cm² , 2.531 µW/cm²
Positive: 126.5 µC/cm² , 2.531 µW/cm²
Negative: 0.001 pC/cm² , 0.001 pW/cm²
Peak
Position: -910. mV , 12.05 sec
Height: 19.062 µA/cm²
Width: 106.0 mV , 5.300 sec


*** Pb [Theoretical potential in HCl 0.1M -440mV]
Determine the peak and integrate the peak with user selected base line 02-09-1999, 15:48:32

DATA
Base line
Mode: Manual
Point 1: -0.537 V
Point 2: -0.358 V
Equation: Y = 28.2118 X +17.489

RESULTS
Integration
Point 1: -0.564 V
Point 2: -0.321 V
Total: 224.1 µC/cm² , 4.482 µW/cm²
Positive: 224.1 µC/cm² , 4.482 µW/cm²
Negative: 0.001 pC/cm² , 0.001 pW/cm²
Peak
Position: -444. mV , 35.35 sec
Height: 60.116 µA/cm²
Width: 66.00 mV , 3.300 sec


*** Cu [Theoretical potential in HCl 0.1M -160mV]
Determine the peak and integrate the peak with user selected base line 02-09-1999, 15:46:57

DATA
Base line
Mode: Manual
Point 1: -0.224 V
Point 2: -0.039 V
Equation: Y = 237.59 X +58.701

RESULTS
Integration
Point 1: -0.259 V
Point 2: 0.03 V
Total: 323.5 µC/cm² , 6.470 µW/cm²
Positive: 322.3 µC/cm² , 6.447 µW/cm²
Negative: 1.153 µC/cm² , 23.06 nW/cm²
Peak
Position: -120. mV , 51.55 sec
Height: 64.945 µA/cm²
Width: 76.00 mV , 3.800 sec

The metals are detected and the peak analysis provides qualitative information about the position and provides quantitative information. Note that the software is capable of blank subtraction.

[1] ELECTROANALYTICAL STRIPPING METHODS - Kh. BRAININA and E. NEYMAN.