Transcription of Basic Principles of Atomic Absorption and Atomic Emission ...
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Basic Principles of Atomic Absorption and Atomic Emission ...
1 Basic Principles of Atomic Absorption and Atomic Emission Spectroscopy 2 Source Wavelength Selector Sample Detector Signal Processor Readout P Flame Atomic Emission Spectrometer 3 Flame Atomic Emission Spectrometer 4 Emission Techniques Type Method of Atomization Radiation Source Arc sample heated in an sample electric arc (4000-5000oC) Spark sample excited in a sample high voltage spark Flame sample solution sample aspirated into a flame (1700 3200 oC) Argon sample heated in an sample plasma argon plasma (4000-6000oC) 5 Flame and Plasma Emission Spectroscopy are based upon those particles that are electronically excited in the medium.
49 What is a background? • It is the signal observed when the element sought is absent • The light at a specific wavelength (Analyte wavelength) is attenuated by the effect of flame components or matrix components in the sample • Thus measured absorbance and analyte concentrations are too high • If problem from flame, blank aspiration will correct for it
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