Newsgroup sci.techniques.mass-spec 1073

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The British Columbia Mass Spec. Discussion Group is hosting a seminar on 
Tuesday, Dec. 3rd at 10:30 am, at the University of B.C., Department of 
Chemistry, Rm D225.
Speaker: Professor Raymond March, Trent University.
Title of seminar: "Quadrupole Ion Trap: Mass Spectrometer and Electronic 
Test Tube Extraordinaire".
For further information please contact Guenter Eigendorf, 
email:eigen@chem.ubc.ca
fax: 604 822-2847

To all Finnigan users,
We have recently purchased the necessary upgrades for installing
QuanGuide onto our DECStation 5000/25. There are two differeing
thoughts as to how much RAM we need. We have upgraded to 40 M of
RAM, and we are told by computer experts that our PC will not support
additional memory. Finnigan says that the DECStation should support at
least 48 M, and that is the minimum needed to run QuanGuide efficiently.
Does any one have any insight or experience with these issues, and any
feelings of the usefulness of QuanGuide for quantitating large sample
runs. All comments are greatly appreciated.
David Vollmer

To all (European) readers of this newsgroup,
At the Department of Toxicology of the University of Nijmegen, The 
Netherlands, we are using a Varian Saturn 4D GC-EI/CI-MS/MS system as a tool 
to support our research in the following fields:
- occupational/environmental exposure to diesel exhaust;
- bioavailability and toxicity of particle associated organics in
  combustion products;
- development of biomarkers of exposure and effects (both local and 
  systemic);
- genotoxic properties of diesel exhaust particles (DEP) and nitro-PAH in 
  particular;
- acute effects of DEP related to the role of reactive oxygen species;
- air sampling methods/strategies to obtain material for bioassays; and
- mass spectrometric analysis of traces of organics associated with
  airborne particulate matter.
From June 9-11 1997 we are organizing:
- the 5th European Meeting on Mass Spectrometry in Occupational and 
Environmental Health,
in Nijmegen, the Netherlands. This is an informal gathering of scientists
actively involved in the development of applications for mass
spectrometric analysis. In this meeting special attention will be given to
diesel exhaust (workshop) and particle associated organics such as PAHs.
If you are interested we would be pleased to put your name on the mailing
list for the 2nd announcement (containing the program). 
Contact address:
Paul T.J. Scheepers, PhD
Department of Toxicology
University of Nijmegen
PO Box 9101
NL-6500 HB  NIJMEGEN
The Netherlands
tel: +31 24 3616878
fax: +31 24 3541802
E-mail: P.Scheepers@toxi.kun.nl

Surfactants is not something that we normally deal with, and certainly not to 
the level where I can tell one formulation from the other.  SO how about some 
helpful suggestions in the following data interpretation:
1) GC/MS  (ROOMS -- regular old ordinary mass spectrometry, positive ion 
electron ionization).  DB5 column, one verl large peak, followed by about 20 
peaks (looks like two series, based on retention time spacings) all the way up 
to the termination of the run at 30 minutes.  Each EI mass spectrum contains
first series:  m/z 57, 71, 85, 89
second series: m/z 57. 71, 85, 89
irregularly appearing ions in the mass spectra are m/z 152, 207, 281, and a 
few others in the 300-400 Da range
2) positive ion LSIMS (neat) shows predominant m/z 371, smaller m/z 719 and 
756, and a series of ions in between at about methylene spacing with about 
equal intenisty.
Apologies -- I know this is probably old hat to some of you, but its a 
little problem that has to be solved quickly, and I don't want to spend a 
few hours to track down the right papers in the GT library 
(although I would be a better person for it).  Thanks for any 
help you can give.
Ken Busch
Chemistry and Biochemistry
Georgis Institute of Technology
kenneth.busch@chemistry.gatech.edu

To get the latest version of this FAQ, send an e-mail message with FAQ as
the first line in the message body to mass-spec@kkm02.chem.emory.edu. The
file will be mailed back to you (be sure to check the return address). To
get other files, send a message with INDEX as the first line. I have the
sci.techniques.mass-spec monthly digest files and some other text files
available.
Other info at http://userwww.service.emory.edu/~kmurray/mslistserv.html
Kermit Murray

Organisation: GB Scientific, Inc.
In response to Dr. Anthony Reeder.
Please feel free to contact me directly regarding negative ion
calibration. Be more about data points. Are you seeing enough ions or
are you scanning too fast?
Calibration should work in negative ion mode. Tick on Hall Probe Data in
experiment and Hall Probe in acquisition. Scan very slowly (30s/dec.)
and be careful not to saturate peaks. Stop acquisition. Then before
trying to accept calibration, probably need to calibrate using the
'manual' option. We use this option quite frequently and works very
well.
As for better compounds for electrospray, what are you currently
attempting to use? PEG compounds have been used successfully.
If this is any help, let me know.
Geoffrey Bott
GB Scientific, Inc.
California, USA
Phone: 01-415-898-7606
Fax: 01-415-898-7514
e-mail: geoff.bott@gbscientific.com