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

Modern Analytical Chemistry

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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