1. Elemental Analysis Service Heriot Watt University Christina Graham

2. What is Elemental Analysis?  Elemental analysis is the determination of the percentage of an element in a sample  Our instrument the CE 440 analyses for the elements carbon, hydrogen, and nitrogen  Other elements can be done externally

3. Schematic Diagram Exeter CE-440 Elemental Analyser

5. How will the service operate?  One day a week  All samples submitted the previous day in the sample bottle provided  All samples accompanied by a completed request form  Results and sample returned to you the next day

8. Request Form  Your sample code should consist of your initials and a number that refers to an individual sample.  Give the formula or at least an indication  Deduce your %CHN content  It is very useful draw the structure on the back of the form  It is essential to complete the hazard assessment

16. How much sample do I need?  If your hydrogen content is <3% 3.0mg  If your hydrogen content is >3% 2.0mg  Samples having a large residue of the order 50% -up to 5mg  Excess sample is always returned

17. Good Working Practice  Ensure that your sample is as pure as it can possibly be  Sample must be free from solvent  Submit samples regularly and on time  Make sure you hand in enough sample

18. Solvent Purity

19. Elemental Analysis Total Usage Jan 2000- July 2004

20. Take care and try to get it right first time!!  For publishable results each element must be within + 0.3%  If sample result is poor you would have to re-purify, dry and resubmit  this costs time, money and is unfair to others

21. Some points to note  Cost of an internal sample is £3  Cost of an external sample is £9 - £15 for a duplicate  Keep a note of your sample code and assay number - a computer record and hard copy will be kept for 5 years

22. Online help  Home page is http://www.che.hw.ac.uk/research/services /chn.html  %CHN calculator  Solvent correction calculator  On-line request form

23. Please don`t say to me!!  Sample is totally pure as the NMR is perfect  Is the instrument working properly?  Urgent sample - only 10 of them!  Not too worried about the result - just a quick check I have the right stuff!!!

24. Good Luck with your research!!!  Looking forward to analysing your samples!!!  Thank you for your time today!!!!

25. Elemental Analysis Usage Jan2000-Jan2003