Molar absorbtivity data for the cobalt and nickel complexes, Ask an Expert

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Molar absorbtivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36,400 and εNi= 5520 at 510nm and εCo= 1240 and εNi= 17,500 at 656nm. A 0.519g sample was dissolved and diluted to 50.0mL. A 25.0mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0mL. This solution had an absorbance of 0.477 at 510nm and 0.219 at 656nm in a 1.00cm cell. Calculate the concentration in ppm of cobalt and nickel in the sample.

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