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Chapter 5

Q. 5.2

A spectrophotometric method for the quantitative determination of Pb^{2+} levels in blood yields an S_{stand} of 0.474 for a standard whose concentration of lead is 1.75 ppb. How many parts per billion of Pb^{2+} occur in a sample of blood if S_{samp} is 0.361?

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Verified Solution

Equation 5.3 allows us to calculate the value of k for this method using the data for the standard

k=\frac{S_{stand}}{C_S} = \frac{0.474}{1.75   ppb} = 0.2709   ppb^{-1}             (a)

Once k is known, the concentration of Pb^{2+} in the sample of blood can be calculated using equation 5.4

C_A=\frac{S_{samp}}{k} =\frac{0.361}{0.2709   ppb^{-1}} =1.33   ppb