Laboratory Materials for Chemical Methods of Analysis
9/10/2014 Introduction to Great Pond. Bring two layers of warm clothing, gloves, and a hat. We will meet behind Keyes at 1 PM sharp.
Field data taken at Goldie on Great Pond.: Sonde – Goldie091114a, Goldie091014a, Buoy – from lab notes
No formal lab writeup this week. Plot both sets of temperature data against a common Y axis (in oceanography and limnology the Y axis is depth and is treated as the independent variable), Please use the appropriate t-test to compare the temperature profiles taken using the YSI Sonde and Goldie’s thermister chain. At the 95% confidence level are the two measurements different (see box 4-1 in your text)? – due at the start of lab next week.
9/17/2014 : CH331 Lab 2: Preparing Solutions and Calibration. Please review all of these materials before lab.
1) Bring a bound lab notebook to lab. (It may be partially used)
2) Bring a pen and calculator.
3) Please wear closed toe shoes and don’t bring your book bags into the lab.
4) Prepare for lab before the start of lab. We will begin lab with a short lab quiz. You may use only your lab notebook and calculator during the quiz. Attached below you will find links to three documents.
Instructions for your specific pH meters will be available in
lab. Reports for part B, the pH lab, will be due at the start of lab next week
10/1/2014 Continue Method Development
10/8/2014 – Lake Sampling
10/15/2014 Complete remaining analysis of field data and report preperation.
Each pair of students should write their lab report in ACS format. See the presentation outline below for report content. I am happy to review drafts. The lab reports are due at the beginning of lab the week of 10/23.
2) Each pair of students should prepare a presentation to the lab group on your analytical method. Both students should be prepared to give the presentation. We will use a suitable random number generator to determine which student will present the lab results.
The presentation should include:
- Why is this analytical method important?
- What is the theory behind the method? Be specific and complete in describing the chemistry
- Methods – What instrument, how does it work, special reagents
- Results – Plot your results relative to other parameters in the lake, temperature, depth, etc. Describe the errors in your results and compare your data to other data. Use appropriate statistical tests. Field Data for each sampling day is posted above.
- Discussion – Summary of your results.
Total time with questions should be 15 minutes.
We will have our presentations in Keyes 104 at the start of the lab period. Please test your presentation in this room before the start of lab.
I am happy to review presentations before you give them. This is a good idea!
10/22/2014 – Presentation of Field work and, Simple Photometer
10/29/2014 – Ca(II) back titration with EDTA Using Your Own Optical Sensor
11/05/2014 – Working with Ion Exchange Columns
11/13/2014 – Silver Ion Selective Electrode
11/21/2013 and 12/4/ 2013 – Cyclic Voltammetry and Rotating Disk Voltammetery