1 / 18

Atomic Spectroscopy: Instrumentation and Applications

This chapter explores the principles and techniques of atomic spectroscopy, focusing on atomic emission, absorption, and fluorescence spectra. It discusses the effect of temperature on atomic spectra and the process of atomization. The instrumentation for atomic absorption spectroscopy is also described, along with potential sources of interference and the advantages and disadvantages of inductively coupled plasma as a radiation source.

dnelms
Download Presentation

Atomic Spectroscopy: Instrumentation and Applications

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 8 and 9(and a little 10) Atomic Spectroscopy Instrumental Analysis Spring 2011

  2. I. Optical Atomic Spectra • Again, these are going to be line spectra • Why are spectrum of different atoms different? Or atom vs. ion?

  3. Atomic Sodium Magnesium (I) ion

  4. emission absorbance fluorescence Schematic of absorption, emission and fluorescence by atoms in a flame.

  5. A. Atomic Emission Spectra • At room temperature all atoms in a sample are in ground state.

  6. B. Atomic Absorption Spectra • Atoms are in hot gaseous medium absorb radiation

  7. B. Atomic Fluorescence Spectra • Atoms can be made to fluoresce by irradiating the flame with an source that contains the wavelengths absorbed by the element

  8. II. Temperature and Atomic Spectra • Has large effect on number of excited and unexcited atomic particles

  9. Example • Calculate the ratio of sodium atoms in the 3p excited states to the number in the ground state at 2500K and 2510K

  10. III. Atomization • Converts sample to gaseous atoms or ionized atoms • Nebulizer

  11. B. Flame atomization • In flame atomizer a solution of the sample is nebulized by a flow of gaseous oxidant, mixed with a gaseous fuel and then carried into a flame where atomization occurs.

  12. C. Flame • In general:

  13. II. Atomic Absorbance Instrumentation A. Radiation Sources

  14. 1. Hollow Cathode Lamp

  15. IV. Sources of Interferences • Spectral Interferences: interfering species that give spectral lines that overlap with analyte lines

  16. B. Chemical Interference • Matrix ion may form complex • Ionization in flame

  17. V. Atomic Emission • Inductively coupled plasma

  18. A. Advantages/Disadvantages of ICP

More Related