TAILIEUCHUNG - Intro to Electroanalytical Chemistry

Matched against a wide range of spectroscopic and chromatographic techniques, the techniques of electroanalytical chemistry find an important role for several reasons: – Electroanalytical methods are often specific for a particular oxidation state of an element – Electrochemical instrumentation is relatively inexpensive and can be miniaturized – Electroanalytical methods provide information about activities (rather than concentration) | 4 30 2012 VILLANOVA UNIVERSITY Introduction to Electroanalytical Chemistry Lecture Date April 27h 2008 Reading Material Skoog Holler and Crouch Ch. 22 An Introduction to Electroanalytical Chemisty See also Skoog et al. Chapters 23-25. Cazes Chapters 16-19 For those using electroanalytical chemistry in their work the following reference is recommended A. J. Bard and L. R. Faulkner Electrochemical Methods 2nd Ed. Wiley 2001. 1 4 30 2012 Advantages of Electroanalytical Methods Matched against a wide range of spectroscopic and chromatographic techniques the techniques of electroanalytical chemistry find an important role for several reasons - Electroanalytical methods are often specific for a particular oxidation state of an element - Electrochemical instrumentation is relatively inexpensive and can be miniaturized - Electroanalytical methods provide information about activities rather than concentration History of Electroanalytical Methods Michael Faraday the law of electrolysis - .the amount of a substance deposited from an electrolyte by the action of a current is proportional to the chemical equivalent weight of the substance. Walter Nernst the Nernst equation Nobel Prize 1920 Jaroslav Heyrovsky the invention of polarography Nobel Prize 1959 Michael Faraday 1791-1867 Walter Nernst 1864-1941 Jaroslav Heyrovsky 1890-1967 2 4 30 2012 Main Branches of Electroanalytical Chemistry Constant current Amperometric titrations I f E Voltammetry I f E Key to measured quantity I current E potential R resistance G conductance Q quantity of charge t time vol volume of a standard solution m mass of an electrodispensed species Static methods I 0 Potentiometry E Interfacial methods Controlled potential Dynamic methods I 0 Bulk methods Conductometry G 1 R Based on Figure 22-9 in Skoog Holler and Crouch 6th ed. Electrogravimetry m Coulometric titrations Q It Main Branches of Electroanalytical Chemistry Potentiometry measure the potential of electrochemical cells without drawing .

• Hoá dầu
• technology petrochemical
• oil and gas transport
• geological drilling
• oil lubrication
• Electroanalytical Chemistry
• ohmic Potential
• oil refining processes
• petrochemical organic
• petrochemical
• Nanomaterials
• polymetallic deposition
• compressor oil
• geological survey standards
• curriculum oil
• lubrication technology
• Oil and Lubricants
• gas dehydration