Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Question
Chapter 21, Problem 21.8QAP
Interpretation Introduction
Interpretation:
The instrumental difference between static SIMS and dynamic SIMS, the difference between information obtained from static SIMS and information obtained from dynamic SIMS, the imaging SIMS and types of information obtained with imaging SIMS should be determined.
Concept introduction:
Secondary ion mass spectroscopy (SIMS) is used to maintain the integrity of the surface by using static or dynamic condition in the time scale duration of the experiment.
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True or False
1. Photodiode arrays are devices within the instrument that help amplify the signal of a sample.
2. Atomic spectroscopy requires the atomization of a sample, which involves nebulization and eventually volatilization to form an elemental vapor.
3. Organic compounds are normally analyzed in atomic spectroscopy despite their small electronic transition range.
Which is TRUE for spectroscopy of a mixture?
A.
The absorbance for a mixture at a particular wavelength is the sum of the absorbances for the components that absorb at the particular wavelength.
B.
Spectrophotometers can differentiate between mixture components that absorb at the same wavelength.
C.
Each component in a mixture has the same molar absorptivity at the same wavelength.
D.
The concentration for each component in a mixture is easily calculated by least squares for guesses of each component when the individual spectra are well resolved.
B. Quantitative Spectroscopy
Prepare two graphs, %T vs. Concentration and Absorbance vs. Concentration, using the data for the cobalt standards. The concentrations of Cobalt standards 2-4 can be calculated using simple dilution calculations. Concentration should be on the x-axis for each of these graphs. The first should clearly show some curvature while the second should be a linear curve.
Using the absorbance graph you can determine the concentration of the unknown. Take the absorbance value for the unknown and find that value on the y-axis. Draw a horizontal line from that point on the y-axis to the plotted line. From the point where the horizontal line intersects the plotted line, draw a vertical line straight down to the x-axis. Record the value from the point where you hit the x-axis as the unknown concentration.
Chapter 21 Solutions
Principles of Instrumental Analysis, 6th Edition
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Similar questions
- 7. Explain what is meant by signal in instrumental analysis.arrow_forwardWhy must solutions with high concentrations be diluted prior to analysis via Beer's Law? A. The relationship between absorbance and concentration is not linear at high concentrations. B. The detector will reach its detection threshold. C. The photon source is too weak to provide accurate results. D. There is no need to work with dilute concentrations; any concentrations will work. E. The molar absorptivity of a compound is dependent on its concentration.arrow_forward1. Describe briefly the differences between primary and secondary stan- dards in terms of their accuracy and their use. 2. What is meant by the "atomic time scale"? How is this time scale related to UT,?arrow_forward
- 4. When plotting a standard curve in absorption spectrophotometry, one uses Abs values instead of %T values. Explain why you need to use Abs values instead of %T values when constructing a standard curve (or a linear Beer's law Plot)arrow_forward5. Why might IR be a useful tool for the analysis of food products in the fight against EMA?What impact would damaged plates have on your spectra? Be specific and justify your answer in a scientifically relevant manner.arrow_forward5arrow_forward
- Find information on fluorescent dye Fluo-3: Display its structure Briefly describe its purpose and the mechanism of operation Display its fluorescence spectra Display transmission spectra of commercially available optical filters required for flow cytometry measurements of cells stained with Fluo-3 (see lecture notes on where to look)arrow_forwardAny information on these spectrums would be helpful! Trying to figure out what specific type of chemical each spectrum belongs to.arrow_forwardFor the experimental data used in this lab, why was it okay to use the absorbance values instead of concentrations?arrow_forward
- 26. What exactly is flame atomic absorbtion spectrometer?arrow_forwardWhich of the following explains why a more concentrated dye solution has a higher absorbance? A. There are more dye molecules in the solution so more isotopes reach the detector. b. There are more isotopes in solution to emit photons. c. There are more dye molecules in solution to emit isotopes. d. There are more isotopes in solution to emit protons. e. There are more dye molecules in the solution to absorb photons.arrow_forward3. In a fluorescence spectrum, what quantities are plotted on the x- and y-axes? In a calibration curve for a fluorescence experiment, what quantities are plotted on the x- and y-axes? 4. Explain the difference between an excitation spectrum and an emission spectrum. Why does the excitation spectrum occur at lower wavelengths than the emission spectrum? 5. What is the main difference in the spectra resulting from atomic emission and molecular emission? 6. Describe how you would use serial dilution to prepare 100 mL of a 0.50 ppm QS solution from a 10 ppm stock QS solution.arrow_forward
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