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Chapter 21: Q1 P (page 555)

In which technique, atomic absorption or atomic emission, is flame temperature stability more critical? Why?

Short Answer

Expert verified

As a result, in emission spectroscopy, temperature stability is more important than in absorption spectroscopy.

Step by step solution

01

Definition of atomic emission and atomic absorption

  • Atomic emission spectroscopy (AES) is a chemical analysis method that employs the intensity of light produced at a certain wavelength from a flame, plasma, arc, or spark to quantify the quantity of an element in a sample.
  • The technique of atomic absorption spectroscopy, or AAS, is used to determine the amounts of metallic elements in various materials. Electromagnetic wavelengths from a light source are used as an analytical tool. These wavelengths will be absorbed differently by different elements.
02

Determine the technique, atomic absorption or atomic emission, is flame temperature stability more critical

  • It must be explained why flame temperature stability is more important in atomic absorption or atomic emission techniques.
  • High temperatures are utilized in atomic absorption and emission spectroscopy. Only in emission spectroscopy does the flame temperature have a significant effect.
  • This is due to the fact that even a little change in temperature causes a shift in the population's excited condition.
  • The population in the ground state does not differ significantly. As a result, in emission spectroscopy, temperature stability is more important than in absorption spectroscopy.

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Most popular questions from this chapter

(a) The atomic absorption signal shown here was obtained with0.0485μgFe/mLin a graphite furnace. The root-mean-square noise in the baseline, measured by the instrument's computer, is s=0.30 vertical units, where each horizontal line on the chart is 1 vertical

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(b) Seven replicate measurements of a standard containing1.00ngHg/Lgave readings of 0.88,1.48,0.94,1.12,1.03,1.40, andin cold vapor atomic absorption (Box 21-1). From Equations 5-5 and 5 -6, estimate the detection and quantitation limits. (Note that in Equations 5-5 and 5-6, the quotient s / m is the standard deviation in concentration.)

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