Rm. Agrawal et al., DETERMINATION OF SMALL CONCENTRATIONS OF HAFNIA IN ZIRCONIA BY SELECTIVE EXCITATION-ENERGY DISPERSIVE-X-RAY EMISSION-SPECTROMETRY, Fresenius' journal of analytical chemistry, 349(6), 1994, pp. 434-437
An energy dispersive X-ray fluorescence method is described for the de
termination of small concentrations of hafnia in zirconia. Bromine K X
-rays from a secondary target in the form of a thick KBr pellet (excit
ed by primary X-rays from a tungsten target X-ray tube) have been used
to excite the analyte Hf L-lines selectively without exciting the mat
rix Zr K X-rays. The Hf Lalpha intensity vs. concentration relation wa
s found to be linear in the concentration range 0.0 - 2.0 percent. The
method gave a minimum detection limit of 45 ppm for 10 min (live) cou
nting time. The results are discussed and the performance of this meth
od is compared with those of WDXRF methods.