Graduate Thesis Or Dissertation
 

Selenium measurement in ground water and biological material by instrumental neutron activation analysis

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  • The utilization of ⁷⁷ [superscript m] Se, half life 17.5 s, and ⁷⁵ Se, half life 119.8 d, for quantification of trace amounts of Se in well water and biological materials by means of instrumental neutron activation analysis (INAA) is described. A Se detection limit of 0.03 ppm was achieved for sheep blood plasma samples which were irradiated for 27 s in a flux of approximately 9x10¹² n cm⁻²s⁻¹, and counted using a Ge(Li) gamma ray spectrometer system. Samples of well water and animal feedstuffs were activated for 13 h at a flux of approximately 3 x 10¹² n cm⁻²s⁻¹ and were also counted using a Ge(Li) based spectrometer system. Under these conditions, the Se detection limit was found to be 0.02 ppb for well water and 0.03 ppm for animal feedstuffs. Activation analysis of the NBS Standard Reference Material SRM 1577a, bovine liver, demonstrated that this methodology for determining Se concentrations yielded excellent accuracy and precision. A comparison is made between the results obtained with neutron activation analysis and those achieved with the automated fluorimetric method. The sensitivity and accuracy for both techniques are approximately equal and hence, the choice of which method to use depends on whether a rapid analysis is required.
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