INVESTIGATION OF HFO-CONVERTER (CORDIERITE) BY INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY( INTERFERENCE IN THE DETERMINATION OF PLATINUM IN A CATALYTIC)

The determination of Pt in cordierite is subject to strong interferenc e by spectral overlap from HfO+ ions with all Pt isotopes. Two mathema tical correction methods based on the HfO+Hf+ ratio and a method for t he chemical separation of Hf based on adsorption chromatography and is otope dilution were investigated to correct for this interference. Flo w infection was used to prevent clogging of the cone orifice. To enhan ce the sensitivity and thus lower the detection limit, thermospray neb ulization was used for sample introduction and the method was compared with pneumatic nebulization. In addition, the memory effects were eva luated for both systems. Analysis of artificial solutions (1 ng Pt ml( -1)) yielded results within 3% of the true value. The Pt content (ca. 50 ng g(-1)) of a cordierite sample, previously exposed to exhaust gas es, could be determined with precisions of about 10-25% and the result s agreed with earlier determinations by other workers.