What if a HPLC system the pressure doesn't get to the normal and there is no leaking ? It's normally at 180 kgf, but now it's abotu 100.... Any idea ? Good...
- air in the system - check valves malfunction Kind regards, Matthias "chang" <chang@...> Gesendet von: chrom-L@yahoogroups.com 07.07.2005 15:32 An: ...
matthias.kummer@...
Jul 14, 2005 10:40 am
2113
Dear friends, I am the member of the group but used to interact very rarely due to my hectic job schedule and also busy life with my an year old baby at home....
One suggestion is to check the flow output. Is it really delivering 1 mL over one minute? (or whatever you set it for.) Perhaps you have an insufficient inlet...
First check your flow rate by collecting the flow at outlet end of column. Either the pump, leak or the column. If pump, could be check valve or leak. ...
Hi somebody has experience with aminoacid derivatization using ethylchloroformate. I'm trying to derivatize homocysteine in body fluids. but neither in the...
Hi, Is this a new column that has the low pressure? Did you change particle size for the column (5 µ particle column is normal but now you have a 10 µ...
the shifflet's
shiffty@...
Jul 23, 2005 12:52 pm
2118
I'm trying to find out if Carbowax seperates compounds by molecular weight, carbon chain length, or polarity of the compounds in a mixture. I was told that...
Dear Christy, on polar phases like DB-Wax (or equivalent) the compounds elute in the order of polarity, i.e. the more polar the compound is, the later it will ...
matthias.kummer@...
Jul 29, 2005 8:46 am
2120
Dear All, does anyone know of a method for quantifying citric acid?...
Dear All Hello I would appreciate if anyone tells me how the mobile phase for ionic compounds is selected in chromatograophy? looking forward to hearing from...
Dear members of this forum, I need your help in order to get an important article for me in order to improve an study of dissolution of a new drug. The article...
tequila2@...
Aug 1, 2005 1:04 pm
2123
Dear members of this forum, Thanks for the article requested for me as always I need your help. I get it in less than one hour Diego Delmonte...
tequila2@...
Aug 1, 2005 2:32 pm
2124
We are working on a very exciting sales position with a niche leader in the Chromatography space. If you know of someone in the Mid-Atlantic or Northeast...
Thursday, July 21, 2005, 10:19:27 PM, you wrote:
b> Dear All, does anyone know of a method for quantifying citric acid?
Ion Exchange Chromatpgraphy
Ion...
Dear members, Does anyone have a suggestion of a HPLC method for gramicidin? Regards, Lucia ... Yahoo! Acesso Grátis: Internet rápida e grátis. Instale o...
Dear members, Does anyone have a suggestion of an HPLC method for gramicidin assay in ointments and creams? I was trying to develop it as per USP 28 but I'm...
A Carbowax seperates by polarity at not by molecular size. For Example Methanol eludes a good time after Hexane. The seperation of modecurlar size in GC...
michael.felke@...
Aug 2, 2005 8:23 am
2129
dear members of the list, what I want to know is the specifications of any column which is used to detect sugar in honey such as fructose glucose maltose etc. ...
Have you called the column manufacturer to get the information? I think that they would have the information or could give you a reference that talks about...
Dear "Chrom-L" chromatographers, I have Turbochrome 4.1 software working with PE Nelson 950A interface. This interface uses a GPIB connection and the PC has a...
Antonije Onjia
ONJIA@...
Aug 3, 2005 6:32 pm
2132
Dear All, I"m physicist, PhD student in Romania in polymer physics field (polar polymers characterization by physical chemical methods-GPC) Since I have to...
Dear Friends I need you opinion about a (weird) idea that was proposed yesterday. This person would like to buy a "hydrogen generator" instead compressed gas...
Dear Arthur, although I haven't tested these devices (hydrogen generators) myself I would consider this as one option if I had to plan a new GC lab. On the ...
matthias.kummer@...
Aug 5, 2005 9:20 am
2135
This does not sound as a weird idea at all. Hydrogen generator are safe, while gas cylinders are very delicate since hydrogen is dangerous. We bought it for...
Valentina Lonzarich
valentina13@...
Aug 5, 2005 11:55 am
2136
Dear All, I want to know ; (1) what is the state-of -the art in Cappillary GC and HPLC techniques significat to chemical industry. (2) Reference...
Dear members of this forum, I would like to exchange information with people who work with Karl Fisher titrators and know the model DL38 y DL 31 from Mettler -...
Diego Delmonte
tequila2@...
Aug 7, 2005 10:12 pm
2138
Kia Ora Arthur Hydrogen generators are an excellent idea, if still a little expensive. I installed my first ones in a lab in the mid 1970's and they worked...
The best place to look is the following home pages: Waters, Agilent, Restek, Supelco, Phenomenex, and any of the other company that sells chromatographic...
Michael and Paula Shi...
shiffty@...
Aug 9, 2005 10:25 am
2140
Hello all. This is a bit off topic, but thought some people on this list may be able to help me out. I have been a part of this group for several years now,...
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