MULTIELEMENT CHARACTERIZATION OF TITANIUM(IV) OXIDE BY ELECTROTHERMALATOMIC-ABSORPTION SPECTROMETRY, INDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY, INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY AND TOTAL-REFLECTION X-RAY-FLUORESCENCE SPECTROMETRY AFTER MATRIX-ANALYTE SEPARATION

A matrix-analyte separation technique for the trace characterization o f titanium(IV) oxide has been developed based pn adsorption of the ana lytes on a column of the cation exchanger Dowex 50WX 8 from 0.1 mol l( -1) HF followed by their elution with 4 mol l(-1) HNO3 in the opposite dow direction, The removal of the titanium matrix with a separation f actor >10(4) was achieved, The separation technique developed was appl ied to the analysis of two titanium(IV) oxide powders of different pur ity grade by electrothermal atomic absorption spectrometry, inductivel y coupled plasma atomic emission spectrometry, inductively coupled pla sma mass spectrometry and total reflection,X-ray fluorescence spectrom etry, The results, including those obtained by neutron activation anal ysis, are compared, For all the determination methods used, the limits of detection are given and the capabilities of the methods are compar ed and discussed.