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 276 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 621 units at the 671 nm emission line. What is the original concentration of Li+ in the serum? The intensity of the serum signal is proportional to the lithium concentration inthe serumIx = k[Lirum]where k is a proportionality constant.The signal intensity of the spiked serum sample is proportional to the lithiumconcentration in the spiked serumVoIx+s = k ([Lia] x + [Lirum) xwhere V,/V and Vo/V are the dilution factors for the standard and the serumrespectively in the spiked sample. The lithium concentration in serum taken from a patient being treated with lithium for manic-depressive illness wasanalyzed using flame emission spectroscopy. A sample of the serum gave a reading of 276 units for the intensity of the 671nm red emission line. Then, 1.00 mL of a 10.8 mM lithium standard was added to 9.00 mL of serum. This spiked serumgave an intensity reading of 621 units at the 671 nm emission line. What is the original concentration of Li* in the serum?[Li*] =mM

Answered: The lithium concentration in serum…

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry

Section: Chapter Questions

Problem 9.15QAP

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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 276 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 621 units at the 671 nm emission line. What is the original concentration of Li+ in the serum?

The intensity of the serum signal is proportional to the lithium concentration in
the serum
Ix = k[Lirum]
where k is a proportionality constant.
The signal intensity of the spiked serum sample is proportional to the lithium
concentration in the spiked serum
Vo
Ix+s = k ([Lia] x + [Lirum) x
where V,/V and Vo/V are the dilution factors for the standard and the serum
respectively in the spiked sample.

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