Subject: Re: What is EAXFS?
From: cody@jeol.com (Chip Cody)
Date: Thu, 14 Nov 1996 18:03:23 GMT
In <56f2vs$26@helka.iif.hu> Yourname@somwhere.COM (Your Name) writes:
>Do anybody know which kind of method is EAXFS?
>I've never heard it.
>Thank you in advance.
Dear "Yourname" :-),
I believe that you mean "EXAFS", which is an acronym for "Extended
X-ray absorption fine structure". This method usually requires access to
a bright broadband x-ray source, such as a synchrotron, although a
clever two-pulsed-laser source has also been used. The spectrum can tell
you quite a bit about the chemical environment around a "unique" atom
such as a metal atom.
You should be able to find out more in the nearest chemistry department's
library.
--
=========================================================================
|____________
|_ Robert B. Cody, Ph.D
|________________________________ Applications Manager
|__ Mass Spectrometry
|________________________ JEOL USA, Inc.
|_
|__________ http://www.jeol.com
|_ e-mail: cody@jeol.com
=========================================================================
Subject: Re: What is EAXFS?
From: Chad Nelson
Date: Thu, 14 Nov 1996 12:12:30 -0500
Your Name wrote:
>
> Do anybody know which kind of method is EAXFS?
> I've never heard it.
> Thank you in advance.
Sounds to me like a typo, should be EXAFS which stands for Extended
X-ray Absorption Fine Structure. This is an X-ray absorption technique
capable of measuring the distance between the atom of interest and its
nearest neighbors.
--
Sincerely,
Chad Nelson
Advanced Fuel Research, Inc.
87 Church Street
East Hartford, CT 06108-3742
"The views expressed above are those of the author and do not
necessarily reflect the views of Advanced Fuel Research, Inc. or any
affiliates."
Subject: Re: Chromatography data systems
From: Douglas Gavilanes
Date: Thu, 14 Nov 1996 16:18:40 -0800
Richard Venn wrote:
>
> Core Laboratories Uk Ltd wrote:
> >
> > In message <5534ee$jkm@ratatosk.uio.no>
> > catob@kjemi.uio.no (Cato Brede) writes:
> >
> > > Hello
> >
> > > I'd like to discuss chromatography data systems:
> >
>
> > XChrom
>
> > Have a look at http://www.labsystems.com or call +44 161 942 3000.
> > They are based
> > in Altrincham, near Manchester, England but have customers all over the world.
>
> > Gavin Shaw
> > gavin@coreabz.co.uk
> >
> > An XChrom User
>
> We use Multichrom - the same servers as XCHROM - but a Vax-based system
> with 80 channels. As far as I know, XCHROM uses the same algorithms etc
> as Multichrom. The problems with Multichrom, and Xchrom I think, are
> that it's slow (you can wait up to 60 sec for screen update), you don't
> know what your detector is doing until you start the aquisition (you
> can't see a signal until it's being acquired) and worst of all, the
> integration/peak-finding algorithms are extremely difficult to
> manipulate. If you have simple chromatography with sharp peaks, OK: but
> if you have difficult chromatography, rising or falling baselines, small
> peaks on humps, it really struggles (and frustrates me immensely). You
> also have several files per run (analysis, run, method, calibration) and
> each one has to be set up separately.
>
> Beckman, Waters, Perkin-Elmer and many others do systems that are more
> user-friendly, it seems. We are actively looking at a replacement
> system.
>
> Dick Venn
I suppose that you've already considered using non-network data systems
(i.e. - multiple channels, one or two GCs or LCs per PC). The PeakSimple
data system by SRI Instruments is a 4-channel, dual GC or LC
chromatography data system with accessible calculation algorithms, DDE
linkage to other apps, plus all of the usual data system software
features (zoom, baseline subtraction, chromatogram overlay, data
manipulation, manual reintegration, etc., etc.). The software is
available in MS-DOS, Win 3.11 and Win '95 iterations, included in the
$1,995 U.S. price, along with a video, tutorial, manual, and DB-9 serial
cable. Oh, yes - this data system does not require installation of any
data acquisition boards in the PC; it's in the external device that goes
between the PC and GC or LC. This data system is portable and can be run
on a notebook or palmtop. I used Yahoo! to find SRI using SRI GC.
Doug in Garden Grove, California
Subject: Help with statistics
From: adrian@liv.ac.uk (Adrian Milton)
Date: Fri, 15 Nov 1996 12:25:34 GMT
Can anyone help....PLEASE
I have a series of data sets which contain outliers, I have shown this
using Dixons Q statistic.
However to continue analysis of the data I ideally would have a
balanced experimental design with no missing data.
HOW DO I REPLACE THE POINTS THAT HAVE BEEN SHOWN TO BE OUTLIERS ????
I have heard various suggestions such as "use the mean of the
remaining data", something about the Median,
What is the best method, and is there anything wrong with any of the
others....
Thank in advance
Adrian Milton
adrian@pop1.liv.ac.uk
-------------------------------------------------
Adrian Milton.
Environmental Biologist.
School of Biological Sciences,
University of Liverpool,
PO Box 147,
LIVERPOOL.
L69 3BX.
U.K.
E-mail: adrian@pop1.liv.ac.uk
Tel: 0151 794 5297
Fax: 0151 794 5289
LIBOV ANDREEVNA: Are you still a student?
TROFIMIV: I expect I shall be a student to the end of my days.
From, The Cherry Orchard II by Anton Chekhov
//\\
<*v*>
- ['-']-
-"-"-
------------------------------------------------
Subject: Re: Oil-soluble Atomic Absorption ionisation supressant wanted
From: B.Hamilton@irl.cri.nz (Bruce Hamilton)
Date: Sat, 16 Nov 1996 11:54:57 LOCAL
In article <56gbij$8m8@status.gen.nz>
djrobert@central.co.nz (David Robertson) writes:
>I am looking for a reasonably priced source of an oil-soluble
>ionization suppressant for Institute of Petroleum Test Method IP 308.
>(Determination of barium, calcium, magnesium & zinc in unused
>lubricating oils - Atomic absorption method). The method specifies
>"a solution containing 2500 mg/l of sodium or potassium (eg as a
>naphthenate or sulphonate) Does anyone have any suggestions?
Sure, when I was working for BP nearly 20 years ago, I
developed a similar method, and an examination of the
additives used for their lubricant formulations revealed
that Astronate M/60E was a 60% w/w solution of sodium
petroleum sulphonate in mineral oil. You just dilute it
with white spirit by gentle warming ( 60C / 5mins )
on a water bath ( taking all the precautions as you will
be above its flash point ). The advantage was that we
in the laboratory could "sample" the production drum
for testing by taking a litre -at no cost to the laboratory.
You can't get much lower cost than that.
I suspect your company will have a similar product
somewhere in their lubricant blending feeds - you just
have to test it to ensure it doesn't contain traces of
the analytes of interest. If not, be nice to the BP
laboratory in Auckland, or contact the makers of
Astronate and find who uses their products in NZ.
Bruce Hamilton
Subject: Significant number rules - but what about computers?
From: kevin@highveld.demon.co.uk (Kevin)
Date: Sat, 16 Nov 1996 10:53:24 GMT
Last year we adopted some significant number rules for all
lab/production calculations and stats (round to the even number etc
etc).
Unfortunately our AS400, VAX'EN and PC's don't use these rules at all
so any calculations done by computer are, technically, incorrect. We
have a disclaimer in our SOP's to say that the rules don't apply to
any calculations done by these computers, which is hardly elegant.
Has anyone found a better solution to this? Particularly, are these
rules the "new way forward" which will soon be incorporated into all
mathematical computation so future versions of these
computers/operating systems will incorporate them, or are they merely
a scientific curiosity?
In our factory, currently about 80% of calculations are done by
computer, and this increases all the time. Soon we will do manual
calculations about as often as we do manual HPLC injections (ie,
never).
Subject: Re: What is EAXFS?
From: horstn@pathcom.com (ICET)
Date: 14 Nov 1996 18:02:25 GMT
I assume you mean EXAFS which is Extended X-ray Absorption Fine Structure.
EXAFS measures the variation of absorption with changing energy (or
wavelenght) over a wide range extending from the absorption edge to higher
energies (up to 1keV).
The principle of the techniques is that ionized photoelectrons interact
with neighbouring atoms in a solid which in turn act as secondary sources
of photoelectron scattering.
The results are detailed information on local structures and especially
bond distances. EXAFS is often use to study silicates and other oxide
glasses. For detail, look into literature dealing with these structures or
check some books on solid state science and analysis.
In article <56f2vs$26@helka.iif.hu>, Yourname@somwhere.COM (Your Name) wrote:
> Do anybody know which kind of method is EAXFS?
> I've never heard it.
> Thank you in advance.
€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€
Innovative Chemistry & Environmental Technolgy (ICET)
Specialists in Inorganic, Solid State, Materials and Nanochemistry
Horst Noglik, Ph.D.
Consulting Chemist, Project Manager, Independent Agent
2240 Weston Rd, Unit#502, Weston, Ontario, Canada M9N 1Y8
Tel: (416) 242-5181, Fax: (416) 242-4879, Email: horstn@pathcom.com
Contact us for your confidential and free initial consultation
€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€€
Subject: Survey of Chrom Training Needs
From: rstember@aol.com
Date: 16 Nov 1996 17:43:50 GMT
AVATAR Consulting, a firm that offers on-site training courses on
chromatography, data handling systems and computers, is seeking input as
we plan new training courses. Your help is appreciated.
We are looking for info on: 1. What data handling systems you use, 2.
How many users are in your lab, 3. What topics should be covered.
Your input, comments and suggestions are welcome. Thank you.
Richard Stember
AVATAR Consulting
rstember@aol.com
(800) 549-4784
Subject: Re: Help?? Regarding PE Optima ICP-AES?
From: clarke@web.net.au (Martin Lindsay)
Date: Sat, 16 Nov 1996 16:50:21 GMT
"Wallabee" wrote:
>Any Optima users out there? Are you satisfied with instrument; MDL's,
>Stability, ability to handle various matrices? Have you tried in
>conjunction with Ultra-sonic Nebulizer?
>Any help would be greatly appreciated.
>Thanks.
We have an Optima 3000 running base metal geochemisty on acid
digestions for mineral exporation.
The instrument is a radial view ICP with a P133 24MB RAM PC
In general, compared with a Spectroflame sim/seq instrument, DLs are
not as good for some elements As, Sb, S, P in the UV.
The detector array has some blind spots, eg As 189.042 is not
available.
The software has its pros and cons.
The flexibility and degree of spectral information gathering is
excellent, as is the MSF interference modelling in the Winlab
software. computer control over operating parameters such as plasma
power, viewing height and gas flows can be individually taiolred for
each element, if you really want to.
We have experienced unpredictable software crashes which vary from
errors which refer to a non existent file in a non existant directory,
to "Undefined error", to hanging in mid air halfway through a run with
no error message and only a reboot will fix it.
Several communications errors between the software and the hardware
have occurred resulting in sundry "stack dump" errors.
Data reporting is attrocious and the online reporter has only the
option to format a report and print it, not to save it in the current
format. The Reformat data option results in a data file for 300
samples for 30 elements of in exces of 9000 lines long, you guessed it
one line for each element for each sample. We caclculated that to load
such a file into our LIMS system would take two days computer time to
load one day's production.
We currently export to Excel and parse into a pivot table, all handled
by a macro.
A disturbing aspect of the software is that if an element is of such
high concentration that the detector is saturated then the Reformat
data utility reports this result as "0"
An upfrade is due early 1997 so I am told.
Database maintenance is mandatory and we archive weekly. One weeks
work results in a ZIP file of 80+MB
Yes that is correct... Eighty Meg after being Zipped...
If you don't do database maintenance then you will crash within a
month, depending on your sample throughput.
If you want any more info Email me
Lots of luck
Martin
Subject: Re: Reduction of organic solvent use in lab.
From: Tom Jupille <72330.265@CompuServe.COM>
Date: 9 Nov 1996 17:57:34 GMT
> Recentry,every HPLC supplier announce new function of "Micro
flow
> HPLC and small bore column". Pretreatment procedure as well.
Does some one know a back ground
> of this trend? Based on something like US-EPA new regulation?
"Microbore" (2mm id and smaller) columns have been around since
the beginning of HPLC. They were eclipsed by 4mm and larger
columns in the '70s. I suspect this was largely the result of
practical problems handling the small peak volumes generated by
efficient small columns. They have made a slow comeback in the
past decade. Initially, this seemed to be driven by concerns
about solvent consumption. I think what we are seeing now is
due to the upsurge in use of LC/MS techniques.
If you convert to microbore, the important thing to remember is
that the ENTIRE system (pumps. injection loop, connecting tubing,
detector cell, ...) must be scaled down in proportion to the
square of the column diameter.
-- Tom Jupille / LC Resources Inc.[www.lcresources.com]
Subject: Lab equipment for sale.
From: richl@icm.planet.net
Date: Thu, 14 Nov 1996 14:26:29 GMT
ICM Laboratories
1152 Route 10
Randolph, NJ 07869
201-584-0330
Fax: 201-584-0515
November, 1996
To whom it may concern:
ICM Laboratories has the following items for immediate sale in as is
condition. Our terms are CASH, or certified bank check and the buyer
is responsible for removal of the equipment and/or freight charges to
his final destination. ICM will consider any and all reasonable offers
for the listed equipment. Contact Richard Levine at x3014 for further
information, etc. The items are presented below in no order of
significance whatsoever. All were purchased new by ICM.
1. Perkin Elmer P2 ICP, dual channel, with AS51 autosampler, PE 7700
computer, PE310 printer and PE software. The instrument is in working
order.
2. Perkin Elmer Model 2390 AA, with R100A recorder. The instrument is
in working order.
3. Dohrmann DX20 MC3 TOX analyzer. The instrument is currently not
working, a temperature control problem, can be either repaired or used
for parts.
4. Perkin Elmer Model 710B IR spectrometer. The instrument is in
working order.
5. Perkin Elmer Model 5100 Zeeman AA with flame attachment, AS60
autosampler, Gateway PC and PC software. The instrument is in working
order.
6. Hewlett Packard Model 5840 GC with 7672 autosampler. The GC can be
used for parts. The autosampler is in working condition.
7. Perkin Elmer Model 770 Computers and PR310 printers.
8. BL Spectronic 710-1. The instrument is in working order.
9. Hamilton Dilutor in working order.
10. S-Evap evaporator.
11. Fisher Sonic Dismembrator Model 300.
12. Fisher Dyna-mix Model 143
13. Fisher Model 5000 recorder.
14. Lifting equipment: Hydraulic hand truck with platform, 30 gallon
barrel lift attachment, 55 gallon barrel lift attachment, parrot beak
drum lift attachment.
