C30J_2010_lecture_5 - C30J Chemical Analysis II Analytical...

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C30J Chemical Analysis II Analytical Atomic Spectrometry Lecture 5 March 26, 2010
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Practical AAS: Instrumental Components External Radiation Source Atomizer Wavelength Selector Detector Sample Introduction System 1 2 3 4 5
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Detectors Photomultiplier Tube (PMT) Photoemissive cathode produces electrons when struck by electromagnetic radiation Additional electrodes called dynodes held at increasingly more positive potential than cathode Electric pulse recorded at anode for each incident photon
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Detectors Photomultiplier Tube (PMT) Anode current α Intensity window
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Newer Photon Detectors: Charge Transfer Devices Charge Coupled Devices (CCDs) Charge Injection Devices (CIDs) Multichannel devices Two dimensional array of individual transducers (pixels) Photons generate charge which is collected and read
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Practical AAS: Instrumental Components External Radiation Source Atomizer Wavelength Selector Detector Sample Introduction System 1 2 3 4 5
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Emitted radiation from atomizer Non-analyte absorption of external source radiation Two problems in AAS
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Source Modulation Background Correction Two corrective measures
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