Perhaps you could put a bit of the polymer of known mass in a vial with a cap and septum. Heat the sample, but not so hot as to decompose the polymer. While...
I am doing semi preparative HPLC of a biologically active compound from a plant source by repeated injections using dichloromethane as mobile phase and a polar...
Hello everybody, Maybe someone can help me, I want to know what the procedure to make a blank run and a col comp in the EnviroQuant chemistation to FID. Thank...
Dear members of this list, I know Fourier Transform Infrared Spectroscopy (FTIR) is not the subject of this list but maybe you help me. I would like to get web...
Diego Delmonte
tequila2@...
Mar 2, 2004 9:42 am
1845
In my opinion, FTIR, too much peaks ( a lot of them), itīs hard to quantify, not impossible. I prefer thermal equipment, easy to use and precise. If you want...
Ok, first try, if you pull out the column and connect a 0 dead volume conector (in the column place), the pressure is less than 10 kgf in both ways of the ...
Eugene, Do you also get a sharp spike in pressure if you make a blank injection of the sample's solvent only? If your solvent blank is non-remarkable then ...
I am doing the HPLC separation of a biologically active compound using a semi preparative column using dichloromethane as eluent and a polar column. I am...
I am doing the HPLC separation of a biologically active compound using a semi preparative column using dichloromethane as eluent and a polar column. I am...
I hope someone can fill me in. From a UV-VIS reference book, I see that a particular drug which I want to look for (via UV-VIS) in an unknown sample, will scan...
Your method is excedding the maximum allowed pressure, or you have your system clogged... ... From: nidiry To: chrom-L@yahoogroups.com Sent: Thursday, March...
... 18:27:00 -0800 (PST) ----- To: grup grup <chrom-l@yahoogroups.com> Subject: Re: Would you check my paper about HPLC for me? Thank you very much! Dear Mr...
... If your column isn't plugged, what is your flow rate, how close is your pressure to the limit before the injection, and how quickly do you make the ...
David Bostwick
david.bostwick@...
Mar 8, 2004 8:02 pm
1856
I am an experienced chromatographer, but not in chiral separation work, although familiar with the technique. I am a native English speaker with ~score...
martinrisk@...
Mar 9, 2004 12:46 am
1857
can anybody give me a method in determining ang quantifying cannabinoid or marijuana metabolites using capillary electrophoresis or hplc? ... Do you Yahoo!? ...
Ok, first, how many kilograms ( or PSI ) goes up when you inject the sample?,normally the pressure goes up if you donīt put the knob at full position, check...
If you email me the paper, I'll read it. I'm a english speaker also but not familiar with HPLC but am willing to learn. Make sure you label the email so I...
I am not sure if this would be better served in a MS group, but this seems like a good place to start. I am using a Kratos Concept (Now manufactured by MSI)...
hello everybody, we have a problem in the analysis of pesticide Lindane on Shimadzu GC- MS. 0.2ul of 912ppm of Lindane was injected in split mode. the peak was...
... Your second injection should be a little over 10% of the intensity of your first one. Assuming that your peak for the 0.2/912 injection was fairly intense,...
GC injector can damage some pesticides at working temperatures. In my experience this has occurred with DDT-DDE. I suppose that the same thing could be...
Hi, can you write injector temperature, interface temperature, column flow, split ratio, temperature program and what QP you have?. 2) Why you inject 0.2ul of...
This instrument has seen very limited use and is exceptionally clean. It has been under a service contract continually. Trace GC/MS includes Trace 2000 GC,...
Dear ALL, Can anyone advice me about the following. "Isoflavones and proteins" are related to eachother when concerned with soy foods. What sort of interaction...
Dear Friends, I am in process of purchasing a simple mass spectrometer. The main application is to idetify peptides in different foods. However the money that...
Is anyone familiar with the Waters U6K injector? I have a couple which I would like to use on a prep HPLC i am setting up but I have no idea how it works....
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