Dear all I need to identify hydrocarbons in the range C5-C15 from a temperature programmed gas chromatographic analysis. Only the n-alkanes peaks can be easily...
N. Pasadakis
pasadaki@...
Jun 1, 2002 2:48 pm
1255
Good morning, Thank you for the link. Barry Dent responded within a day. He was unsuccessful. He did suggest I contact a company that offers to do...
Hi everyone Does anyone know where the best place would be to get hold of pure samples of common components of essential oils (e.g. limonene, citral etc? Do...
... A quick Google search for "essential oils" resulted in a lot of hits for aromatherapy sites. The few I looked at sell single oils, mixtures, and kits. I...
David Bostwick
david.bostwick@...
Jun 4, 2002 5:03 pm
1258
Try http://www.chemsources.com Al Alvin J. Boning, Jr. Chemist P.O. Box 110910 Department of Animal Sciences University of Florida Gainesville, Fl 32611 Bus...
I published a paper on this way back in early 70's in J Chrom. Basically, if you are using a linear temp programme you can just leave out the log terms in the...
Sigma Aldrich carries these and many others. Rodney George Senior Research Chemist Gas Separations Research Supelco 595 North Harrison Road Bellefonte, PA...
Hello fellow chromatographers, this question primarily goes out to the environmental community but here goes. My lab is considering the purchase of an HPLC...
See Digest Number 368 for some info and opinions on HPLC systems, but not related to env. samples. ... -- Have you thanked a volunteer today? Please visit...
Jan & Al
alekat@...
Jun 7, 2002 2:42 am
1264
I think, in fact, that the best supplier is aldrich-sigma-fluka. they have, apart the normal catalogue, also a flavours and fragrances-catalogue, you should...
Hello, has anybody experience with the chiral separation of BOC-protected amino acids (BOC [= tert butyloxy carbonyl] group attached to the amino group of the...
We may need a consultant for use in vitamin analysis. If you are an expert in that area or know someone who is could you let me know. It would be much...
Good morning, Try this company. I just know of them, I don't know about them so I can't make a recommendation. I just contacted them about a source for the...
Hi, I have not tested PAH samples but I have used HPLC systems for many years. I have used Agilent, Waters and Thermo Separations and I recomend all of the...
The Shifflet's
shiffty@...
Jun 12, 2002 2:19 pm
1270
Greetings All, Does any one know where I could obtain some hamamelitannin to use as a standard in an HPLC method? Any help would be much appreciated. Thanks, ...
gperham@...
Jun 14, 2002 8:08 pm
1271
Hi: Can you help me? someone can tell me, about chrom's of oil seeds by GC. where can I find some information? tanks. J.C....
Hello, we have a problem, getting a GC analysis of ethanol and i-propanol in toluene with a relative error less than 0.5%, desired by our customer. We are...
Michael.Felke@...
Jun 17, 2002 8:32 am
1273
Sorry again! Send this message private by mistake. ... Michael Felke An: "emmanuel.samuel" <EMMANUEL.SAMUEL@...> 17.06.02 11:24 Kopie: ...
Michael.Felke@...
Jun 17, 2002 9:26 am
1274
Hi Michael, Leaking septa and/or ferrules and connections can be the source of these kinds of problems. You can also experience this by not using proper...
Rob Wohleb
WOHLEB@...
Jun 17, 2002 3:37 pm
1275
Michael, In the real world, split injections on capillary columns often give Relative Std Deviations of 1% or more. But 5% is way too much. I would GUESS,...
I suspect pollution in my column PRPX400 cation exchange with Fe 3+ (7µm 250 cm) (FECL3, 6 H2O) > no peak with guard column + column and big tailing without...
Does any member of this group have experience in integrating a gas sampling valve (GSV) with a sample splitter for injection onto wide-bore or capillary...
Dear Sir/Madam, I need benzyl glucosinolate as an internal standard for determination of glucosinolate contents in juncea or mustard. VWR used to have it, it...
Jing An
jing.an@...
Jun 21, 2002 3:16 pm
1279
[The Shifflet's] Hi, What is the purge time and your split flow? Are your units correct - g/L that is high for GC analysis. I would prepare your samples in...
The Shifflet's
shiffty@...
Jun 24, 2002 10:06 am
1280
For Split analysis a purge time is not appropriate (unlike splitless) Also these units are not high for split analysis GC, I routinely analyses hydrocarbon...
We have found that some integrators can be sensitive to even slight tailing on a peak. Seemingly small variations in detecting the end of the peak could...
Patrick_Calway@...
Jun 26, 2002 3:58 pm
1282
Hi,
I was incorrect about the purge time, I meant to write split flow. Thanks for catching the mistake.
I have generally observed repeatability...
The Shifflet's
shiffty@...
Jun 27, 2002 10:29 am
1283
Good morning, I'm in the process of scouting out the marketplace in preparation for the purchase of a GC (one or two channels, capillary, FID). I've solicited...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
