ICP-AES analysis of high purity bismuth oxide

Analysis of high-purity bismuth oxide by atomic absorption spectrometry with reactive distillation of the matrix

“…Though chromium concentration was determined by the ETA AAS method in both the studied samples and bismuth oxide from Furukawa, this impurity was excluded from the list of analytes, because the concentration of chro mium found experimentally by the added-found method was much lower than the added concentra tion. Note that chromium was included into the list of elements determined by the DCA AES procedure [7] and was not determined by the ICP AES procedure [11]. According to the data [14], chromium under cer tain conditions can form volatile CrCl 3 chloride; how ever, the physicochemical modeling of the behavior of impurities in the reactive distillation of a bismuth oxide matrix [15] indicated that losses of this impurity were low probable.…”

“…Another possible explanation for chromium losses can be the difference in the methods of preparation of concentrate samples. In the DCA AES procedure [7], concentrated acids and a spectral buffer on the basis of graphite powder were added to the concentrate and the sample was triturated, whereas in the ICP AES procedure [11] and the pro posed ETA AAS procedure, the concentrate was only washed with acids.…”

“…Note that, though DCA AES [7] and ICP AES [11] procedures with the preliminary separation of the sample matrix by reactive distillation as BiCl 3 Table 5. Estimation of the accuracy of the results (wt %) of ETA AAS analysis of bismuth oxide by the added-found meth od (P = 0.95)…”

“…Combined procedures of the AES analysis of bis muth oxide were described in [7,11]. An DCA AES procedure with bismuth separation by distillation as bismuth trichloride and preconcentration of impuri ties on a graphite powder ensured the limits of detec tion for Ag, Al, Be, Ca, Co, Cr, Cu, Mg, Mn, Ni, Pb, Pt, and Ti at a level of 10 -8 -10 -6 wt % [7].…”

“…An DCA AES procedure with bismuth separation by distillation as bismuth trichloride and preconcentration of impuri ties on a graphite powder ensured the limits of detec tion for Ag, Al, Be, Ca, Co, Cr, Cu, Mg, Mn, Ni, Pb, Pt, and Ti at a level of 10 -8 -10 -6 wt % [7]. An AES procedure with spectrum excitation in inductively coupled plasma (ICP) combined with the same method of matrix separation ensured the determina tion of 22 impurities with limits of detection of 10 -9 -10 -6 wt % [11].…”