Acousto-optic background correction for inductively coupled plasma atomic emission spectrometry
Carnahan, Jon W.
Ph.D. (Doctor of Philosophy)
Department of Chemistry and Biochemistry
Acoustooptical devices; Inductively coupled plasma atomic emission spectrometry
A solid-state acousto-optic deflector (AOD) or modulator (AOM) was mounted in a 0.5 m monochromator with inductively coupled plasma atomic emission spectrometry (ICP-AES) background correction. The fused silica AOM was used for ultraviolet (UV) spectral region applications while the glass AOD was used for the visible (VIS) region. The system provided rapid sequential observation of adjacent on and off-line wavelengths for background correction. Acousto-optic (AO) background correction was successfully employed for six elements in the visible region of the spectrum. Both pneumatice nebulization (PN) and electrothermal vaporization (ETV) sample introduction methods were investigated. The linearities of the calibration plots were good for both PN and ETV. The r² values for PN ranged from 0.991 to 0.999993 and from 0.990 to 0.99997 for ETV. Detection limits were calculated for the elements with each sample introduction technique. Detection limits using PN ranged from 2 to 20 ppm and the ETV detection limits ranged from 3 to 100 ng. AO background correction was successfully employed with ICP for fifteen elements in the UV region of the spectrum. Both PN and ETV sample introduction methods were investigated. The linearities of the calibration plots were good for both PN and ETV. The r² values for PN ranged from 0.997 to 0.99995 and from 0.992 to 0.999997 for ETV. Detection limits were calculated for the elements with each sample introduction technique. The PN detection limits ranged from 0.3 to 8 ppm and the ETV detection limits ranged from 1 to 65 ng. Finally, potable water and vitamin tablets were analyzed for Ca, Cu, Fe, Mg, Mn, and Zn with the flint glass AOD and the fused silica AOM. Flame atomic absorption (FAA) was used to verify the accuracy of the AO background correction system. Overall, the ICP and FAA methods yielded similar mean concentrations for both the water samples and the vitamin samples. These values agreed on average within ±13% for all samples and elements analyzed.
Miller, Heather M., "Acousto-optic background correction for inductively coupled plasma atomic emission spectrometry" (2002). Graduate Research Theses & Dissertations. 976.
xviii, 224 pages
Northern Illinois University
Rights Statement 2
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.
Includes bibliographical references (pages -224)