< Assignment Score: 33.3% Resources Hint Check Answer Question 1 of 3 The lithium concentration in serum taken from a pa

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Assignment Score 33 3 Resources Hint Check Answer Question 1 Of 3 The Lithium Concentration In Serum Taken From A Pa 1 (20.6 KiB) Viewed 10 times

Assignment Score 33 3 Resources Hint Check Answer Question 1 Of 3 The Lithium Concentration In Serum Taken From A Pa 2 (49.33 KiB) Viewed 10 times

< Assignment Score: 33.3% Resources Hint Check Answer Question 1 of 3 The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness was analyzed using flame emission spectroscopy. A sample of the serum gave a reading of 3.40 x 10 units for the intensity of the 671 nm red emission line. Then, 1.00 mL of a 10.8 mM lithium standard was added to 9.00 mL of serum. This spiked serum gave an intensity reading of 765 units at the 671 nm emission line. What is the original concentration of Li" in the serum? mM [Lit] = KX

Resources Hint Check Answer Question 2 of 3 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 °C overnight and ground them in a scientific blender, resulting in approximately 50 g of homogenized dry weight. A representative 91.79 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 85.0 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 Absorbance (mL) (mL) 5.00 0.00 0.080 5.00 2.50 0.119 5.00 5.00 0.163 5.00 7.50 0.200 5.00 10.00 0.241 Determine the amount of Cd2+ per gram of dry clam. Express your final result as milligrams of Cd²+ per gram of dry clam. amount: mg Cd²+/g clam