Simultaneous kinetic determination of cobalt, nickel and iron by coupling stopped-flow techniques and charge coupled device detection

Two kinetic approaches were applied for the simultaneous determination of c obalt, nickel, and iron with multiple linear regression (MLR) method, using the entire kinetic curves or the initial rates of the reaction. The predic tive ability of MLR method is based on the slight kinetic differences of th ese metals which occur at a great number of wavelengths when they react wit h xylenol orange as a common ligand. The reactions were monitored using a c harge coupled device (CCD) W-VIS spectrophotometer attached to a stopped-fl ow system. This instrumentation allowed to obtain kinetic data at a maximum of 2048 wavelengths simultaneously. The method was successfully applied to the simultaneous determination of these metals in alloys and the results o btained from the two kinetic approaches were compared. (C) 2000 Elsevier Sc ience B.V. All rights reserved.