Graduate Thesis Or Dissertation
 

Design of a chemiluminescence photometer and its application to trace chromium (III) analysis

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/s7526h10f

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  • The design and construction of a chemiluminescence photometer is described. The design is based on a discrete sample system which has a number of advantages over the previously described flow cell system and centrifugal analyzer. The advantages include simple and inexpensive equipment, small sample size, versatile electronic readout system, and temperature controlled cell holder. The system may be used for the determination of Cr(III) in natural samples. Digestion procedures are developed for measuring Cr(III) in natural samples since Cr(III) can be determined by chemiluminescence analysis only if it is present in solution as free Cr(III). The Cr(III) determination is made using the luminol and hydrogen peroxide system. Reagent concentrations and reaction conditions are optimized and a calibration curve is obtained. The detection limit is 4 x 10 ⁻¹⁰ M or about 5 ppt. The dynamic range is 10⁻⁹ M to 10 ⁻⁵ M and the relative standard deviation is about four percent. A digestion procedure for biological samples was developed and tested on an NBS Orchard leaf standard. The Cr levels were found to be 2.2 ± 0.4 ppm.
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