Natural Science Forum / Chemistry / Analytical Chemistry / June 2004

My first posting to this group.
I'm doing an unpaid personal project which involves estimating the
numbers of organic chemicals with formula Ci Oj Nk Sl Pm Hn for
arbitrary integers i,j,k,l,m,n and approximating the Gibbs energy of

I've a problem regarding UV-Vis,hope u all can help me out.
I'm trying to synthesize TiO2 doped with ferric nitrate. So far,I've
synthesized the undoped TiO2 powder and i need to get its absorbance
spectrum so that i can compare this powder with the doped powder that

I'm trying to do a Karl-Fisher titration. But I haven't done it for a
long time and even than I used the pyridine based reagent. Now I'm using
this Hydranal reagent. Does anybody used it? What's used in it instead
of pyridine? (Alternatively: where can I find more information on ...

HI, everyone:
    How are you?
I encounted a weird distillation problem, I need pure  formic acid for
organic acids extraction. But the formic acids supplied contain the

What is the dead time equation for an LC column for an HPLC system?
Thanks.
John

Hi people,
does anybody have a good book or god information source on purge and
trap analysis    of volatiles organic compound in water.
thank you very much and have a nice day group

I am looking for a report that lists the total area integrated for a
run.  This seems like an easy thing that should be automatically
included in a variety of report formats, but I can't find it.  If I go
to Data Analysis >Chromatogram > Percent Report it's on there, but as

I'm writing a software named ezData, which is used to process the data
from chromatographs, CEs, etc.
Now, it functions well. You're welcome to download and use it at my
website:

Does anyone have approximate concentrations for this specific column's
organic test mix.
(3.9x300mm 10u particle size)

I am preparing a buffer for LCMS analysis of estrogens. The column that
I am using is a Phenomenex Luna which is stable up to pH 10. I would
like to prepare a triethylamine buffer solution with pH of 9.5. My
question is, should I measure the pH before or after mixing the buffer

I'm looking for 'glass-to-metal transition tube'
Swagelok don't sell this product any more.
Do you know the company that make 'glass to metal transition tube'?
Please inform me.

HELP: problems with LCQtune software
Hy,
I am a researcher working in mass spectrometry field and I have a
problem with the LCQtune software for the LCQdecaXP instrument. I have