Analytical Chem istry - DePauw University

Chapter 10 Spectroscopic Methods653wavelength (nm) e Cu (M –1 cm –1 ) e Ba (M –1 cm –1 )595 11900 7100600 15500 7200607 18300 7400611 19300 6900614 19300 7000620 17800 7100626 16300 8400635 10900 9900641 7500 10500645 5300 10000650 3500 8600655 2200 6600658 1900 6500665 1500 3900670 1500 2800680 1800 150025. Blanco and colleagues report several applications of multiwavelengthlinear regression analysis for the simultaneous determination of twocomponentmixtures. 9 For each of the following, determine the molarconcentration of each analyte in the mixture.(a) Titanium and vanadium were determined by forming complexeswith H 2 O 2 . Results for a mixture of Ti(IV) and V(V) and for standardsof 63.1 ppm Ti(IV) and 96.4 ppm V(V) are listed in thefollowing table.absorbancewavelength (nm) Ti(V) standard V(V) standard mixture390 0.895 0.326 0.651430 0.884 0.497 0.743450 0.694 0.528 0.665470 0.481 0.512 0.547510 0.173 0.374 0.314(b) Copper and zinc were determined by forming colored complexeswith 2-pyridyl-azo-resorcinol (PAR). The absorbances for PAR, amixture of Cu 2+ and Zn 2+ , and standards of 1.00 ppm Cu 2+ and1.00 ppm Zn 2+ are listed in the following table. Note that you mustcorrect the absorbances for the metal for the contribution fromPAR.