Analytical Spectroscopy

There is an Analytical Chemistry A-Pages article to read for the atomic fluorescence spectroscopy section of class.

You should read "Sub-Part-per-Billion Analysis of Aqueous Lead Colloids by ArF Laser Induced Atomic Fluorescence" by S. K. Ho and coworkers before class on 11/02/09.

Discussion Questions:

1. What is colloidal lead?
2. Why is the spectral background significantly reduced when using atomic fluorescence compared to this group's earlier laser-induced plasma spectroscopy experiment?
3. The excitation wavelength is 193 nm while the main fluorescence is at 405.8 nm. Identify the type of fluorescence observed in this work.
4. Why does the colloid size influence the signal strength?
5. Why couldn't the authors use their original calibration curve when analyzing tap water? What advantage do they gain by using standard addition instead?
6. How would AES or AAS analysis of the lead colloid samples compare to the work presented herein?

Posted by Christy Haynes at 8:37 AM | Permalink | Comments (0)

Please post this week's minute papers as "comments" to this post. Minute papers should be posted by 5 pm on Friday. Feel free to read your classmate's posts.

Posted by Christy Haynes at 8:36 PM | Permalink | Comments (7)

I've included missing slides from Wednesday's lectures in the notes posted for Lecture 20.

Download the pdf file.
Download the powerpoint file.

Posted by Christy Haynes at 6:45 PM | Permalink | Comments (0)

Download the pdf file.
Download the powerpoint file.

Posted by Christy Haynes at 4:12 PM | Permalink | Comments (0)

On Monday, we will finish the notes you already have and go over the answers for exam 1.

Posted by Christy Haynes at 10:01 AM | Permalink | Comments (0)

Please read this paper for in-class discussion on 10/28/09.

Discussion Questions:

1. Why is background correction so important when using a furnace as the atomizer?
2. What is meant in the statement, "...possibility of inaccurate correction if the background is structured..."? Why is a continuum source background correction insufficient in this case?
3. The authors state that one of their goals in this work is to "... indicate how implementation of the Zeeman effect influences such factors as sensitivity and analytical range for many of the commonly determined elements." Summarize their results related to this goal.
4. Are the sensitivity trends the same for normal and anomalous Zeeman splitting? Why or why not?
5. Why does hyperfine structure (splitting of different J values) influence Zeeman corrected sensitivity?
6. Why is the artificial seawater sample matrix so disadvantageous when using continuum source background correction? Why is the Zeeman corrected spectrum improved?
7. What is the role of the monochromator's spectral bandpass in both continuum source and Zeeman corrected AA spectra?
8. Compare and contrast the three methods used to perform Zeeman correction: DC magnet around the atomizer, AC magnet around the atomizer, and DC magnet around the hollow cathode lamp.

Posted by Christy Haynes at 1:57 PM | Permalink | Comments (0)

Exam #1 is tomorrow, October 23rd, from 3:30-5:30 pm in Smith 111. Please bring a pencil, scientific calculator, and an equation sheet (as detailed in the syllabus).

Posted by Christy Haynes at 11:20 AM | Permalink | Comments (0)

Please post this week's minute papers as "comments" to this post. Minute papers should be posted by 12 pm on Sunday (this week only). Feel free to read your classmate's posts.

Posted by Christy Haynes at 10:38 AM | Permalink | Comments (1)

Below you will find exams from 2006 and 2007 that correspond loosely with the exam we'll have on October 23rd.

Download the 2006 exam.
Download the 2007 exam.

Posted by Christy Haynes at 12:48 PM | Permalink | Comments (0)

Download the pdf file.
Download the powerpoint file.

Download the pdf file for lecture 17.
Download the poewrpoint file for lecture 17.

Posted by Christy Haynes at 2:13 PM | Permalink | Comments (0)

This paper is a good reference:
http://pubs.acs.org/cgi-bin/article.cgi/ancham/2002/74/i12/pdf/ac020190r.pdf

Posted by Christy Haynes at 9:52 AM | Permalink | Comments (0)

We will finish the previously posted lecture notes.

Posted by Christy Haynes at 2:13 PM | Permalink | Comments (0)

Please post this week's minute papers as "comments" to this post. Minute papers should be posted by 5 pm on Friday. Feel free to read your classmate's posts.

Posted by Christy Haynes at 10:39 AM | Permalink | Comments (5)

Download the pdf file.
Download the powerpoint file.

Posted by Christy Haynes at 5:42 PM | Permalink | Comments (0)

Next week is the first of two exams in CHEM 8152. In case you would like some extra problems to work as you study, I have gathered some relevant material in the document included below. I have adapted these from several sources and do not have answer keys for them. I only provide them for your reference. They are not required, and they will not be collected. Download extra practice problems.

Reminder: You should make a one-page equation sheet (see specifications in syllabus) to use during the first exam. I will not provide equations as part of the exam.

Posted by Christy Haynes at 10:57 AM | Permalink | Comments (0)

There is an Analytical Chemistry article to read for the detector section of class.

You should read "A Charge Coupled Device Array Detector for Single-Wavelength and Multiwavelength Ultraviolet Absorbance in Capillary Electrophoresis" by Edmund T. Bergstrom and coworkers before class on 10/16/09.

Download discussion questions.

Posted by Christy Haynes at 8:32 AM | Permalink | Comments (0)

Download the ppt file.
Download the pdf file.

Posted by Christy Haynes at 4:03 PM | Permalink | Comments (0)

Download problem set 2.

Posted by Christy Haynes at 10:51 AM | Permalink | Comments (0)

We will continue with the notes posted for Lecture 11.

Posted by Christy Haynes at 6:54 PM | Permalink | Comments (0)

Please post this week's minute papers as "comments" to this post. Minute papers should be posted by 5 pm on Friday. Feel free to read your classmate's posts.

Posted by Christy Haynes at 10:37 AM | Permalink | Comments (5)

Download the pdf file.
Download the powerpoint file.

Posted by Christy Haynes at 3:59 PM | Permalink | Comments (0)

If you didn't already hear, this year's Nobel Prize in Physics was given for two technologies very relevant to CHEM 8152 students - fiber optics and CCD detectors:

http://nobelprize.org/nobel_prizes/physics/laureates/2009/

Posted by Christy Haynes at 10:29 AM | Permalink | Comments (0)

Download the powerpoint file.
Download the pdf file.

Posted by Christy Haynes at 4:52 PM | Permalink | Comments (0)

We are going to continue with the notes posted for lecture 8.

Posted by Christy Haynes at 4:01 PM | Permalink | Comments (0)