科研之友
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摘要
A comparison of trace element determinations of low atomic number (Z) elements Na, Mg, Al, P, K and Ca in air, helium and vacuum atmospheres using WL beta(1), mo K alpha and Cr Ka excitations has been made. For Mo K alpha and WL beta(1) excitations a Si (Li) detector with beryllium window was used and measurements were performed in air and helium atmospheres. For Cr K alpha excitation, a Si (Li) detector with an ultra thin polymer window (UTW) was used and measurements were made in vacuum and air atmospheres. The sensitivities of the elemental X-ray lines were determined using TXRF spectra of standard solutions and processing them by IAEA QXAS program. The elemental concentrations of the elements in other solutions were determined using their TXRF spectra and pre-determined sensitivity values. The study suggests that, using the above experimental set up, Mo Ka excitation is not suited for trace determination of low atomic number element. Excitation by WL beta(1) and helium atmosphere, the spectrometer can be used for the determination of elements with Z = 15 (P) and above with fairly good detection limits whereas Cr K alpha excitation with ultra thin polymer window and vacuum atmosphere is good for the elements having Z = 11 (Na) and above. The detection limits using this setup vary from 7048 pg for Na to 83 pg for Ti.
- 出版日期2014-9-1
