2. An analyst prepares a spike by adding 2.00 ppm Pb (from a lead standard) to a blood serum sample whose Pb content wa

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2. An analyst prepares a spike by adding 2.00 ppm
Pb (from a lead standard) to a blood serum sample whose Pb content
was 0.50 ppm. The final reading of the AA spectrometry analysis of
the spike solution was 2.20 ppm Pb. How much lead (Pb) did the
analyst recover in this solution?
a. 91%
b. 12%
c. 88%
d. 100%
8. In atomic absorption, a manganese (Mn) radiation
source consists of:
a. a nichrome manganese wire
b. a manganese anode
c. a cylindrical manganese cathode
d. a quartz tube filled with manganese