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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Chapter 5, Problem 5.6QAP
Interpretation Introduction
Interpretation:
Signal-to-noise ratio for a DC current shown in a figure should be estimated.
Concept introduction:
The mean current is given as
For a DC current, the signal-to-noise ratio is defined as follows,
If the deviation from the mean value is assumed to be random, the standard deviation of a DC current can be measured as follows,
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The table shows a series of standard additions of Cu(II)to acidified tap water samples measured by anodic stripping voltammetry at a platinum electrode. The unknown and all standard additions were made up to the same final volume.
1. Plot absorbance as a function of the concentration of Cu (II) standard. Determine the equation of the line and the X intercept. Find the concentration of Cu(II) in the water.
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