Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Question
Chapter 8, Problem 8.5QAP
Interpretation Introduction
Interpretation:
The reason for greater emission intensity of sodium lines at 589 and 589.6 nm for a solution containing KCl in comparison to the solution in which KCl is absent should be determined.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Sodium spectrum has bright doublet at 588.995 and 589.592 nm. This is said to be sodium D-lines. The intensity of the line at 589 nanometers is twice that of the intensity of the line at 589.6 nanometers.
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Below an energy dispersive spectroscopy (EDS) graph of a sample that has been coated with carbon for electron collection is given. Determine what elements this sample definitely consists of. Explain your reasoning. Which of the elements present in this sample can cause fluorescence in Fe (26) if it was present here?
Describe the formation of
(i.) line emission spectra,
(ii.) line absorption spectra.
2.
The content of sodium in a cooking salt substitute for a low-sodium diet can be
determined by atomic emission spectroscopy using the addition standard calibration method.
10.07 g of sample are weighted and solved in 10 mL 1M HCI and 100 ml of water. This solution
is transferred to a 250.0 mL volumetric flask and water is added to the mark.
Calibration standards are prepared adding to 5 different 50.0 ml volumetric flasks, 25.0 ml of
the sample solution, and 0, 1, 3, 5, and 8 ml respectively of a standard sodium solution. The
standard sodium solution has been prepared by dilution up to 100.0 mL of 20.0 ml of another
solution that contains 0.2501 g Nacl in 1.0 L of water.
Instrumental responses are the following ones:
Volume
of
sodium
1.0
3.0
5.0
8.0
standard (mL)
Response (a.u.)
1.79
2.63
3.54
4.81
6.18
Provide the concentration of sodium in the cooking substitute expressed in mg Kg!.
Chapter 8 Solutions
Principles of Instrumental Analysis
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