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Stripping Analysis

Outline of Topics . Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis ApplicationsWater ContaminationPharmaceuticals Overall Conclusions . Outline of Topics . Introduction Uses for Stripping Analysis Types of Stripping An

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Stripping Analysis

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    1. Stripping Analysis Presented By: Erin Gallagher

    2. Outline of Topics Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis Applications Water Contamination Pharmaceuticals Overall Conclusions

    3. Outline of Topics Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis Applications Water Contamination Pharmaceuticals Overall Conclusions

    4. Voltammetry Measuring the current as the potential is varied during an electrolysis reaction Yields current vs. potential graph Voltammogram Stripping Analysis is a type of voltammetry

    5. Why use Stripping analysis? Determine concentration of trace heavy metals present in a sample Most sensitive Electroanalytical technique 10-12 M range Broad use of technique 12-15 metal ions analyzed

    6. Types of Stripping Analysis Anodic Stripping Voltammetry (ASV) Preconcentration step takes place at a negative potential Cathodic Stripping Voltammetry (CSV) Preconcentration step takes place at a positive potential Adsorptive Stripping Voltammetry (AdSV) Preconcentration step occurs by physical adsorption

    7. Outline of Topics Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis Applications Water Contamination Pharmaceuticals Overall Conclusions

    8. The Experiment Preconcentration Step Analyte is collected on working electrode Common working electrodes used: Mercury Film Electrode (MFE) Hanging Mercury Drop Electrode (HMDE) Stripping Step Analyte is “stripped” from electrode Current measured during this step

    9. Data Analysis Current versus Potential graph stripping voltammograms What metals are present AND their respective concentrations Peak position potential (Ep) : characteristic Concentration calibration curve

    10. Example Data

    11. Outline of Topics Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis Applications Water Contamination Pharmaceuticals Overall Conclusions

    12. Metal Ion analysis in contaminated water samples using anodic stripping voltammetry Goal Analyze Ag(I), Cu (II), Pb(II), Cd(II), and Zn(II) Tap water, lake water, well water, wastewater treatment sludge, and soil. Nanocrystalline diamond thin-film electrode No toxic properties

    15. Trace lead analysis in intermediates and final products of syntheses of pharmaceuticals Goal: Determine lead concentration in pharmaceuticals Metal ions complex to proteins inducing conformational change

    18. Outline of Topics Introduction Uses for Stripping Analysis Types of Stripping Analyses The Experiment How to conduct Data Analysis Applications Water Contamination Pharmaceuticals Overall Conclusions

    19. Overall Conclusions Used for determining trace heavy metal concentration Examples: contaminated water samples and pharmaceutical syntheses Technique consists of a preconcentration step and a stripping step.

    20. References Harris, D.C. (2010) Quantitative Chemical Analysis (8th Ed) Voltammetry: Stripping Analysis. (pp 376-382) New York, NY: W.H. Freeman and Company. Alghamdi, A.H. Applications of stripping voltammetric techniques in food analysis. Arabian Journal of Chemistry. 3 (2010) 1-7. Sonthalia, P et al. Metal ion analysis in contaminated water samples using anodic stripping voltammetry and a nanocrystalline diamond thin-film electrode. Analytica Chimica Acta. 552 (2004) 35-44. Pravda, M., Vytras, K. Application of stripping voltammetry to trace lead analysis in intermediates and final products of syntheses of pharmaceuticals. Journal of Pharmaceutical and Biomedical Analysis. 14 (1996) 765-771.

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