An inductively coupled plasma acousto-optic tunable filter hyperspectral imaging (ICP-AOTF-HSI) system was used to examine multiple nebulizers with respect to strontium ionization and atomization chemistry in an ICP. A charge-coupled-device (CCD) camera was used to take plasma analytical line and background images of strontium emissions, in order to obtain spatially resolved elemental emission images. This information allowed for data manipulation to elucidate plasma chemistry processes. The resulting analyte emissions were monitored while multiple parameters were altered such as ICP power, AOTF power, liquid analyte uptake flow rate (Q1), nebulizer gas flow rate (Qg), nebulization system, and the addition of easily ionizable elements. The resulting data were used to compare the behavior and efficiency of these nebulizers. The nebulizers used for these experiments were a Cetac U5000 AT+ ultrasonic nebulizer, Meinhard HEN 90A and HEN 170A high efficiency nebulizers with water-cooled Scott dual pass spray chambers, a Meinhard TR30-C1 pneumatic nebulizer with a water-cooled Scott dual pass spray chamber, and a Burgener Mira Mist enhanced parallel path nebulizer with a water-cooled Scott dual pass spray chamber.
Additional experiments were done to determine the ability of the ICP-AOTF-HSI system to be used for elemental speciation. Y(I), Y(II), and YO emissions were found and monitored at 643.500, 437.494, and 597.2 nm using both the ICP-AOTF-HSI system and an ICP-monochromator system while altering plasma parameters. The plasma parameters altered were nebulizer gas composition and ICP power. The yttrium emission from both systems were compared and contrasted. These data determined that the AOTF-HSI system could be used for elemental speciation.
|Advisor:||Carnahan, Jon W.|
|Commitee:||Ballantine, David S., Duffin, Kirk L., Gaillard, Elizabeth R., Vanysek, Petr|
|School:||Northern Illinois University|
|Department:||Chemistry and Biochemistry|
|School Location:||United States -- Illinois|
|Source:||DAI-B 70/08, Dissertation Abstracts International|
|Keywords:||Acousto-optic tunable filters, Hyperspectral imaging, Inductively coupled plasma|
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