hi all Iwant to know about separation and determination of erucamide (additive) in polypropylene by gass chromatography.( papers and books about this work) ...
HT300A also known as the EuroAS300 (LAS) Liquid Autosampler. We are looking for anyone interested in purchasing a brand new HT300A Liquid Autosampler. It is...
Can someone help me troubleshoot? I have an Agilent 11 HPLC equipped with an ELSD and DAD. I am experiencing intermittent negative peaks in my UV traces. My...
Join a leading provider of technology solutions to the Pharmaceutical and Biotech vertical. My client is a very innovative and exciting company to work for....
... Are they sharp peaks or the width of your normal LC peaks? Sharp peaks are often due to electronic noise. Check for loose connections, or for other...
David Bostwick
david.bostwick@...
Dec 2, 2003 2:29 pm
1771
There could be a number of reasons for the negative peaks. If you are running multiple channels or a gradient method, there could be a problem with smooth...
Please give more details about these peaks. Are they of short or long duration? They could be either electronic artifacts, like a decaying UV lamp, or real...
I am running Varian Star software, controlling a Varian 3400 GC-FID for the analysis of Gasoline Range Organics in water. The analysis procedure requires that...
hello everybody: I need to know as soon as possible the aprox. cost for a GC with ECD, FID, NPD and autosampler.. please help me... thank janneth ... ...
janneth ruiz
jannetheruiza@...
Dec 3, 2003 8:49 am
1775
Baovmai, You might have degassing due to negative pressure or siphoning on the waste line. If it is this problem you might want to put on a cheap BPR (back...
I recommend to check the setting of the reference wavelength and bandwith of the diode array detector in comparison to the uv spectrum of your peaks. If by...
matthias.kummer@...
Dec 3, 2003 8:55 am
1778
This is an easy thing to happen with the Agilent DAD. It sets a default of 550 nm, so if a compound absorbs there it will be very odd at any other monitoring...
Can someone help me about RNA and DNA separation in seawater with HPLC , is there any separation method for these compounds in literatures. Thank You Doruk...
This has been an interesting discussion. I always turn of the background wavelength. Do others find it useful? Thanks, mike ... From: John Fetzer...
The Shifflet's
shiffty@...
Dec 5, 2003 10:01 pm
1781
Dear All, We are looking for Capillary Column CBP-W25-300 for Gas Chromatography. I need the manafactures information and where I can get this capillary...
When working near the detection limit, i.e. when there are a few milliAU you see a difference in the noise levels. Using a baseline reference reduces the ...
Hello members of chrom-L group, We are searching for HPLC methods of analysis for enzymes, polysaccharides, carbohydrates, acids (fatty and nonfatty),...
If you need three detectors, check with your Varion sales representative. Theirs, is the only one that I know of with the ability to have three detectors,...
Hello, I'm trying to perform an analysis using very short (6m) megabore columns (0.53mm) into dual ECDs. The problem I am having is that the A/D box won't...
Frens! I want to know is there any adsorption of the smaple vapour will occur in the packed methyl siloxane column in High Performance Gas Chromatography as in...
Hi, I am trying to do the HPLC analysis of oligosaccharides. can anybody give me any suggestion about what column and methods I should use? try to buy the...
GC with nonpolar (methylsilicone) columns is normally considered to be based on solvation rather than adsorption. The choice of carrier gas makes little...
GC with nonpolar (methylsilicone) columns is normally considered to be based on solvation rather than adsorption. The choice of carrier gas makes little...
Thankyou Mike! Actually we are dealing with lambda cyhalothrin it's a pyrethroid compound , insectide powder active ingredient. we use dicyclohexyl phthalate...
Hello! New to the group; it looks like a great resource. We're having a vexing problem with two of our SIL-10ADVP autoinjectors. They develop a Z-axis offset...
My Boss is looking at opening 3 Analytical labs in Boston, DC area and Chicago. Hence rather than having every capital equipment rep chasing us I would like...
John Rynak
jtrynak@...
Dec 19, 2003 2:54 pm
1794
Use some oil or grease for the spindle which let run the needle assembly up and down. We had the same problem and after we did some grease to the spindle our...
Jan Wenzel
j.wenzel@...
Dec 19, 2003 5:35 pm
1795
SpotBot Microarrayer We are still looking for anyone interested in purchasing a brand new SpotBot™ Personal Microarrayer. It is brand new and in perfect ...
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