1. Chem. 133 – 1/26 Lab Lecture

2. Lab Topic: Data Processing How to Set Up Folders Saving Raw and Processed Data Excel Processing of Raw Data

3. Data Processing How to Set Up Folders Whenever possible, use your own folders Advantages: –All your stuff should go there –Nobody else’s stuff should go there –Easier to find data/methods and less likely to have data overwritten Example: Chemstation

4. Data Processing Saving Raw Data I Typical instrument data consists of wavelength or time and response(s) Most software programs allow you to obtain raw data For some instruments (Buck GC), data presented using Excel looks nicer than software chromatograms (with the exception of no integration)

5. Data Processing Saving Raw Data II Steps in Process: –Open file (in ChemStation, you need to be in Data Analysis mode) Example: Chemstation

6. Data Processing Saving Raw Data III Steps in Process: –Look for way to “export” file or “save file as” with the output being a “text” file (these usually have a.txt extension) In ChemStation, text file made as “CSV” file

7. Data Processing Saving Raw Data IV Steps in Process: –Once in text format, you can open using “notepad”, but best to move to Excel –Demonstrate opening Expfil using notepad and in Excel

8. Data Processing Saving Processed Data I For Lab Reports, you will want to incorporate chromatograms and spectra Besides switching raw data to Excel, you also can use instrument software plots In ChemStation: use Graphics → Copy to Clipboard The Alternative (used extensively for these Powerpoint slides) is SHIFT Print Screen: This Copies the Screen Demonstrate Both of these methods allow you to paste chromatograms into other programs

9. Data Processing Data Smoothing in Excel Demonstrate using trendline for a running average and also using average function with Excel