# Question 5.3: A second spectrophotometric method for the quantitative dete...

A second spectrophotometric method for the quantitative determination of Pb^{2+} levels in blood gives a linear normal calibration curve for which

S_{stand} = (0.296 ppb^{–1}) × C_S + 0.003

What is the Pb^{2+} level (in ppb) in a sample of blood if S_{samp} is 0.397?

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