An environmental chemist working for the Environmental Protection Agency (EPA) was directed to collect razor clams from aheavily-contaminated river superfund site and analyze them for their Cd²+ content using graphite furnace atomic absorptionspectrometry (GFAAS). The chemist dried the clams at 95 °℃ overnight and ground them in a scientific blender, resulting inapproximately 50 g of homogenized dry weight. A representative 73.69 mg sample was taken from the approximately 50 g ofdry material and dissolved in 100.0 mL of 0.1 M HCl to create a sample solution. Using the method of standard additions, thechemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the samplesolution. Varying amounts of a 84.0 ppb (µg/L) Cd²+ standard were added to each of the flasks, which were then brought tovolume with 0.1 M HCl. The Cd²+ content of the solutions was then analyzed using GFAAS, resulting in the absorbance datagiven in the table.Sample Volume Cd²+ Standard Volume(mL)0.002.505.007.5010.00Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram of dry clam.(mL)5.005.005.005.005.00Absorbance0.0800.1190.1630.2000.241

Varying amounts of Cd2+ standard solution of concentration (84.0 ppb/L) were added to unknown sample…

Answered: Determine the amount of Cd²+ per gram…

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Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd2+per gram of dry clam.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

An 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 their Cd²+ content using graphite furnace atomic absorption
spectrometry (GFAAS). The chemist dried the clams at 95 °℃ overnight and ground them in a scientific blender, resulting in
approximately 50 g of homogenized dry weight. A representative 73.69 mg sample was taken from the approximately 50 g of
dry material and dissolved in 100.0 mL of 0.1 M HCl to create a sample solution. Using the method of standard additions, the
chemist prepared five standard solutions in 100.0 mL volumetric flasks, each containing 5.00 mL aliquots of the sample
solution. Varying amounts of a 84.0 ppb (µg/L) Cd²+ standard were added to each of the flasks, which were then brought to
volume with 0.1 M HCl. The Cd²+ content of the solutions was then analyzed using GFAAS, resulting in the absorbance data
given in the table.
Sample Volume Cd²+ Standard Volume
(mL)
0.00
2.50
5.00
7.50
10.00
Determine the amount of Cd²+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram of dry clam.
(mL)
5.00
5.00
5.00
5.00
5.00
Absorbance
0.080
0.119
0.163
0.200
0.241

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