Critical Reviews in Analytical Chemistry, (2014), 44(4), pp. 311 to 327 VALIDATION OF AN ICP-MS METHOD FOR THE QUANTIFICATION AND DISCRIMINATION OF TRACE METALS AND APPLICATION IN PAPER ANALYSIS, I.Gh. Tănase, Dana Elena POPA, Gabriela Elena Udriştioiu, A.A. Bunaciu and H.Y. Aboul-Enein