Abstract
In the present work the air/acetylene flame atomic absorption spectrometry was used for bismuth determination in complex oxides. Interference studies were carried out, and interference with vanadium and molybdenum was detected. The method of standard additions and traditional calibration curve method were used. Calibration and standard addition curves were fitted with linear and polynomial functions. It was shown that using polynomial function gives better results for the standard additions method for determination of bismuth by acetylene/air flame atomic absorption spectrometry. The calibration curve method was shown to be correct at low ( 10mg/L) concentration of an interferent.
Highlights
Bismuth-containing complex oxides show excellent ionic-conductive, ferroelectric, catalytic and photocatalytic properties [1,2,3,4,5]
That is why the use of sulphuric acid is strongly discouraged for Bi-containing ceramic dissolution, but if it cannot be avoided, the matrix effect must be taken into account
We showed that Relative Absorbance Decrease (RAD) is almost concentration-independent in the presence of HCl (4.5 mol/L), HNO3 (4.5 mol/L), H2SO4 (4.7 mol/L), V (20 mg/L) or Mo
Summary
Bismuth-containing complex oxides show excellent ionic-conductive, ferroelectric, catalytic and photocatalytic properties [1,2,3,4,5]. A variety of analytical techniques of Bi determination includes spectrophotometric [10,11], electro analytical methods [12], solid phase extraction [13] and cloud point extraction [14] methods All of these methods are quite sensitive, but all of them require separating the sample from other metals and concentrating of bismuth. The analysis of Bi-containing complex oxides by spectrophotometric and electroanalytical methods requires complex sample preparation and separation of Bi from another elements and mineral acids These operations can be partially ignored if using any kind of FAAS, but crucial information on the optimal measurement conditions and effects of the presence of different metal ions has not been reported yet. Solutions for analysis were prepared from stock solutions by appropriate dilutions
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