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Chapter 21: Q3 P (page 555)

Figure 21 - 10shows a temperature profile for a furnace atomic absorption experiment. Explain the purpose of each different part of the heating profile.

Short Answer

Expert verified

Drying, Ashing, and Atomization are the three heating profiles in the furnace atomic absorption experiment.

Step by step solution

01

Definition of atomic absorption.

Ground-state atoms of metals absorb light at extremely particular wavelengths matching to the energy required to trigger electronic transitions in their electron orbitals, a process known as atomic absorption.

02

The purpose of each different part of the heating profile.

Drying, Ashing, and Atomization are the three heating profiles in the furnace atomic absorption experiment.

The Drying process takes place at a temperature range of~20掳C-100掳C. Water is removed from the sample in this step.

The Ashing process takes place at a temperature range of ~100掳C-500掳C. Without evaporating the analyte, as much matrix as possible is removed from the sample.

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Most popular questions from this chapter

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(a) The atomic absorption signal shown here was obtained with0.0485渭驳贵别/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

unit. Estimate where the baseline is beneath the tall signal and measure the height of the signal. Estimate the detection limit for Fe, defined as the concentration of Fe that gives a signal height of 3 s.

(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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