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 5, Problem 5.3QAP
Interpretation Introduction
Interpretation:
The frequency range which is well suited for the noise minimization needs to be explained.
Concept introduction:
Chemical analyses are related with two types of noise which are chemical noise and instrumental noise. Chemical noise is due to reasons that affect the chemistry of the system being analyzed. Instrumental noise is components of the instrument. There are four types of instrumental noise and they are thermal noise, shot noise, flicker noise and environmental noise.
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In a hydrogen-oxygen flame, the atomic absorption signal for iron was found to
decrease in the presence of high concentrations of sulfate. Suggest an explanation for
this observation and propose one possible method for overcoming the potential
interference of sulfate in the quantitative determination of iron.
2. The following is the relative number of molecules in the vibrational states of the 1CI molecule determined
from spectroscopy:
Vibrational level
E,
E,
E,
E,
E,
E,
Relative Population
100
53.5
28.6
15.3
8.2
4.4
Calculate the temperature of the sample given that the vibrational frequency is 1.15 x 10"s'.
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