THE SIMULTANEOUS DETERMINATION OF CU, FE, AND NI IN CONCENTRATED ULTRAPURE ACIDS

Copper, iron, and nickel have been determined simultaneously in concen trated ultrapure hydrofluoric acid, hydrochloric acid, and nitric acid . The characteristic masses were 22 pg for Cu, 12 pg for Fe, and 28 pg for Ni. The instrumental detection limits for the three elements are 4.1 pg (0.2 mug/L) for Cu, 7 pg (0.35 mug/L) for Fe, and 10.3 pg (0.52 mug/L) for Ni. The precisions obtained at concentrations of 10 mug/L are 1% RSD for Cu, 1.6% RSD for Fe, and 2.9% RSD for Ni. The calibrati on curves are linear up to 2200 pg (110 mug/L) for Cu, 400 pg (20 mug/ L) for Fe, and 1400 pg (70 mug/L) for Ni. The recoveries in acids were between 90 and 120%.