Natural Science Forum / Chemistry / Analytical Chemistry / April 2005

Hi. I'm interested in how MALDI-MS generates charged species with
non-charged analytes.
A sample can be co-crystalised with a sodium salt, and then non-charged
analytes may be seen in the mass spectrum with a mass equal to that of

I wonder if someone can help me out with this. I've been doing this
experiment where i would heat KOH solution in water bath at 90 degrees
C. My initial pH of the solution is 11. after heating it for 1 hr, the
pH drops to 10. Isn't it supposed to be constant? What's really going

I am seeking some opinions about calibrations we are having a bit of a
debate where I work about the extrapolation of values above and below
calibration lines.
I work for a relatively large pharmaceutical company where we do a number of

Ho everyone,
I red a paper and in that paper the author wrote about the
concentration of hydrogen peroxide used was 50 FL/L without explaining.
Can anyone tell me what does it stand for?

I have to determine acids like butoxy acid, furanic acid etc
does any one know how I can determine those with a simple HPLC procedure
kind regards,
Frederik

My topic on Agilent ChemStation was hijacked by Shigehiko Hattori
posting an anti-Shimadzu rant. How is it possible that a common user,
not a moderator to my knowledge, could change the topic title??? Now no
one will read my question after this change, thinking it is just a

Agilent ChemStation Custom Reports - HELP!
I have started a new job where we use Agilent's ChemStation (ver.
A.10.01) for LC/MS/DAD analysis. My prior experience was either with
Waters' Millennium or Beckman's PeakPro software. ChemStation is

Does anybody know the type of HPLC column used for cyclosporin A (CsA)
characterization/separation?

anybody there with experience regarding determination of carbohydrates in
varying foods using chromatography on anion-exchanger and pulsed
amporemetric detection? We are just testing a system but are not right
convinced on robustness in routine analytics. We want to determine major

Dispute Over Award Of Chemistry Nobel Prize  (it figures)
http://www.khaleejtimes.co.ae/ktarchive/091202/theworld.htm
(be sure to scroll half way down the page)
STOCKHOLM - A bitter dispute has erupted among scientists over the

I'm currently etching brass using Ferric Chloride solution purchased
from Radio Shack. Obviously after a while the reaction slows down and
I have to replenish the etchant.
Currently I am disposing the spent ferric chloride by first