environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd²+) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 61.00 mg sample was taken from the ~ 50 g of dry material and dissolved in 100.00 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.00-mL volumetric flasks, each containing 5.00-mL aliquots of the sample solution. Varying amounts of a 87.0 ppb (ug - L-¹1) cadmium standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The solutions were then examined for their Cd²+ content using GFAAS, resulting in the following absorbance data. Sample Vol. (mL) Cd2+ Standard Vol. (mL) 0.00 2.50 5.00 7.50 10.00 5.00 5.00 5.00 5.00 5.00 Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram of dry clam. Number Absorbance 0.080 0.119 0.163 0.200 0.241 2+ mg Cd²+ / g clam
environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd²+) content using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A representative 61.00 mg sample was taken from the ~ 50 g of dry material and dissolved in 100.00 mL of 0.1 M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five standard solutions in 100.00-mL volumetric flasks, each containing 5.00-mL aliquots of the sample solution. Varying amounts of a 87.0 ppb (ug - L-¹1) cadmium standard were added to each of the flasks, which were then brought to volume with 0.1 M HCI. The solutions were then examined for their Cd²+ content using GFAAS, resulting in the following absorbance data. Sample Vol. (mL) Cd2+ Standard Vol. (mL) 0.00 2.50 5.00 7.50 10.00 5.00 5.00 5.00 5.00 5.00 Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram of dry clam. Number Absorbance 0.080 0.119 0.163 0.200 0.241 2+ mg Cd²+ / g clam
Chapter8: Sampling, Standardization, And Calibration
Section: Chapter Questions
Problem 8.12QAP
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Transcribed Image Text:environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect
razor clams from a heavily-contaminated river superfund site and analyze them for cadmium (Cd²+) content
using graphite furnace atomic absorption spectrometry (GFAAS). The chemist dried the clams at 95° C
overnight and ground them in a scientific blender, resulting in ~ 50 g of homogenized dry weight. A
representative 61.00 mg sample was taken from the ~ 50 g of dry material and dissolved in 100.00 mL of 0.1
M HCI to create a sample solution. Using the method of standard additions, the chemist prepared five
standard solutions in 100.00-mL volumetric flasks, each containing 5.00-mĹ aliquots of the sample solution.
Varying amounts of a 87.0 ppb (ug · L-1) cadmium standard were added to each of the flasks, which were
then brought to volume with 0.1 M HCI. The solutions were then examined for their Cd²+ content using
GFAAS, resulting in the following absorbance data.
Sample Vol. (mL) Cd2+ Standard Vol. (mL)
0.00
2.50
5.00
7.50
10.00
5.00
5.00
5.00
5.00
5.00
Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram
of dry clam.
Number
0
mg
Absorbance
0.080
0.119
0.163
0.200
0.241
Cd²+ clam
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