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?
Step-by-Step
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