A. J. Mukhedkar and N. V. Deshpande (Anal. Chem., 1963, 35, 47, DOI: 10 . 1021 /ac 60 194a014) report on a simultaneous determination for cobalt and nickel based on absorption by their 8-quinolinol complexes. Molar absorptivities (L mol-1 cm-1) are (Co = 3529 and (Ni = 3228 at 365 nm and (Co = 428.9 and (Ni = 0 at 700 nm. Calculate the concentration of nickel and cobalt in each of the following solutions (1.00-cm cells):