Atomic Absorption Spectroscopy Chapter 21 (pg453-470) Atomic Absorption Spectrometry What is it used for? - Trace Analysis of Elemental Species ppm ppb concentration range 70 elements at the ppb level
Independent of oxidation state in sample
- Messy samp
Statistical Treatment of Data
Reading Assignment; Chapter 4 Pages53-72
Statistics gives us tools to accept conclusions that have a high probability of
being correct and to reject conclusions that do not.
(for random errors we use statistics)
We say that t
Spectroscopy: Introduction
Outline
Properties of Light
The Spectrophotometer for absorption methods
Light sources
Wavelength selection
Detectors
Errors in Spectrophotometry
Required reading in our text: Chapter 20 pg 424-449
Spectrophotometry is any proce
Standard Deviation and Probability Percentage of Observations in Gaussian Distribution Range 1 2 3 Gaussian Distribution 68.3% 95.5% 99.7%
(percent means that there is a 68.3% that any given number in the data set will fall around the given mean-whatever
Measurements and Errors Reading Assignment: Chapter 3 pages39-50 Outline Significant Figures Types of Errors Propagation of Error
We should know that all measurements have some associated uncertainties. These arise from two broad sources: limitations of t
Case #3: Comparing Individual Diferences
(We are using t test with multiple samples and are comparing the diferences
obtained by the two methods using diferent samples without the duplication of
samples. For example; it might be reference method vs. new m
Case #2: Comparing Replicate Measurements (Comparing two sets of data that were independently done using the "t" test. Note: The question is; "Are the two means of two different data sets significantly different?" This could be used to decide if two mater
Case #1: Comparing a Measured Result to a "Known Value" Example A new procedure for the rapid analysis of sulfur in kerosene was tested by analysis of a sample which was known from its method of preparation to contain 0.123% S. The results obtained were:
Calibration for Analytical methods
Outline
Calibration
Blanks
Standards
Internal standards
Finding the "Best" Straight Line
Sample size
Detection limits and Sensitivity
Signal and noise
Required reading in our text:
Chapter 4 pg 65-72
Chapter 5 pg 78-92
C
Test 2 Example
Name_
1. (30 pts) Put a check in the correct column of this series of true/false questions.
Read each carefully.
True
The energy separation between all neighboring energy
levels of a harmonic oscillator are constant
The energy separation be