You are analyzing a forensic sample for the presence of controlled substances using HPLC. Which ofthe following detectors would be the best one to use to confirm the identities of the substances inthe sample?UVevaporative light scatteringrefractive indexelectrochemicalMS Look at Figure below which represents a gas chromatogram obtained at 40° C. If youchromatographed the same sample at 25° C how would the chromatogram change?Detector responseSolvents1 15HO -K2,3-Dimethyl-2-butanol1-Butanol101151-Pentanol20125Time (min)the peaks would be closer togetherthe peaks would be larger in areathe peaks would be farther apart30the peaks would be smaller in area351-Hexanol^InjectionFigure 24-8 Chromatogram of alcohol mixture at 40°C using packed column(2 mm inner diameter x 76 cm long) containing 20% Carbowax 20M on Gas-Chrom Rsupport and flame ionization detector. [Courtesy Norman Pearson.)4045

You are analyzing a forensic sample for the presence of controlled substances using HPLC. Which of the following detectors would be the best one to use to confirm the identities of the substances in the sample? O UV evaporative light scattering refractive index electrochemical

You are analyzing a forensic sample for the presence of controlled substances using HPLC. Which of the following detectors would be the best one to use to confirm the identities of the substances in the sample? O UV evaporative light scattering refractive index electrochemical

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.

Question

You are analyzing a forensic sample for the presence of controlled substances using HPLC. Which of
the following detectors would be the best one to use to confirm the identities of the substances in
the sample?
UV
evaporative light scattering
refractive index
electrochemical
MS

Look at Figure below which represents a gas chromatogram obtained at 40° C. If you
chromatographed the same sample at 25° C how would the chromatogram change?
Detector response
Solvents
1 1
5
HO -K
2,3-Dimethyl-2-butanol
1-Butanol
10
1
15
1-Pentanol
20
1
25
Time (min)
the peaks would be closer together
the peaks would be larger in area
the peaks would be farther apart
30
the peaks would be smaller in area
35
1-Hexanol
^
Injection
Figure 24-8 Chromatogram of alcohol mixture at 40°C using packed column
(2 mm inner diameter x 76 cm long) containing 20% Carbowax 20M on Gas-Chrom R
support and flame ionization detector. [Courtesy Norman Pearson.)
40
45

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