Hi, Someone could point me some reference about interference of chloride in TMS reactions using a strong silyl donnor as MSTFA or BSTFA ? Any Book, Paper or...
Dear all members Hello I intend to determine and measure total organophosphate and organochlorine pesticides in soil and water. Coula anyone please help me...
Hello, I wonder if anybody experienced this or has any suggestions or ideas. I'm using LC/MS, where LC is Agilent 1100 and MS is from Applied biosystems,...
Greetings In our laboratory we made a calibration curve for compound Furan in dilectric oil. for HPLC, the max concentration for this curve is 1000 ppm, soon...
Dear members; i am working with WATERS HPLC and i am not that familiar with the running of the instrument. Could any tell me if there any training course in...
Hi members, Did anyone has experience on the determination of APEO (alkylphenol ethoxylate) by HPLC-MS? How to quantify the concentration of different...
Hi all, I am Ms.Anish did M.Sc., M.Phil in Chemistry having 7+ years working experience in various fields starting from environmental chemistry, agriculture...
dear members of the list; I have some trouble with water soluble and fat soluble vitamin analysis by HPLC. First, the methods I am trying to use are for...
dear members of the group; we are seeking for an expert for a 3 day training about method validation and uncertainity with HPLC and LC-MS/MS equipment.the...
Dear members of the list, I need your help in order to get an article which it is very important for me to improve my determination of midazolam by HPLC. This...
tequila2@...
Dec 1, 2004 11:53 am
2013
Dear members of this list, I am looking for information about Ion Pair Chromatography by INTERNET my intention is reading something about the whicg is the good...
tequila2@...
Dec 2, 2004 10:42 am
2014
Hi all, I want to do Ph.D. and want to know the details regarding the foreign Ph.D. scholarships available for Indian students. Thanks in advance anish...
Hi Anish! What would you like to be the focus of your PhD.? Tim anishganesh <anishganesh@...> wrote: Hi all, I want to do Ph.D. and want to know the...
Dear members; i am working with WATERS HPLC and i am not that familiar with the running of the instrument. Could any tell me if there any training course in...
Dear member of this forum, I am looking for information about characteristics of Lichrospher 100RP-18 (5 um). The information solicited is: pH range, maximum...
tequila2@...
Dec 10, 2004 12:30 pm
2019
Dear members of this forum, My question is about the verification (operational qualification) of Liquid Chromatographer from Agilent Model 1100. In this step I...
tequila2@...
Dec 11, 2004 8:05 pm
2020
Dear group members, I am experiencing problems in my baseline during my HPLC run. I am seeing large rolls at the start and at the end of my ...
Questions: 1. What is your mobile phase gradient? 2. Analytes? 3. Prep method? 4. Can you plot pressure on your system along with your chromatograph? 5....
Dear All, Thank you all very much for your responses. I do feel as though I need to clarify a little. The rolls that I am observing occur at distinct points...
The absorbance spectrum of TFA varies with the ACN concentration (I believe they form a charge-transfer complex, but I would't say that with certainty). It's ...
Some comments Increasing your equilibration times between runs will eliminate the first set of "wobbles" Are you going to 100% acetonitrile? My preference is...
Dear members of this list, I appelate to you in spite of my problem is not the main subjet of this group but I need your help in order to solve a analytical...
tequila2@...
Dec 21, 2004 10:58 am
2027
Dear members, In some reference methods, perchloric acid or sodium perchlorate was used in the mobile phase. This substance is difficult to find in our...
DMSO is (was) used as a solvent for OVI in the United States Pharmacopea. In the OVI testing DMSO had several impurity / degradation peaks and the longer the...
the shifflet's
shiffty@...
Dec 22, 2004 4:03 pm
2029
Although you don't describe your HPLC hardware, I think the fundamental reason for the baseline disturbances at the gradient extremes in your solvent system...
Not PC but Merry Christmas, anyway: Bob Ziegler's response reminded me of a time I was having the same problem with solvent mixing. I didn't have the time of...
David Bligh
david.bligh@...
Dec 23, 2004 1:00 pm
2031
Merry CHRISTmas to list members! David reminds me of my own halcyon daze (We used a lot of ether back then.) of youth. I was performing gravity fed low...
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