Question 5.9: A seventh spectrophotometric method for the quantitative det...

Modern Analytical Chemistry

A seventh spectrophotometric method for the quantitative determination of $Pb^{2+}$ levels in blood gives a linear internal standards calibration curve for which

$\left\lgroup\frac{S_A}{S_{IS}} \right\rgroup_{stand} =(2.11 ppb^{-1})\times C_A-0.006$

What is the concentration (in ppb) of $Pb^{2+}$ in a sample of blood if $(S_A/S_{IS})_{samp}$ is 2.80?

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