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Question 5.8: A sixth spectrophotometric method for the quantitative deter...

A sixth spectrophotometric method for the quantitative determination of Pb^{2+} levels in blood uses Cu^2+ as an internal standard. A standard containing 1.75 ppb Pb^{2+} and 2.25 ppb Cu^{2+} yields a ratio of SA/SIS of 2.37. A sample of blood is spiked with the same concentration of Cu^{2+}, giving a signal ratio of 1.80. Determine the concentration of Pb^{2+} in the sample of blood.

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