Natural Science Forum / Chemistry / Analytical Chemistry / March 2006

ESLAM ALAKOM  EVERYBODY
I want any information about molecular and atomic spectroscopy
also about U.V(ULTRA VIOLET) I.R(INFRA RED) NMR
or any sites about them

Good morning, I'm a student-worker of chemistry. I need information or
internet sites about the analytic techniques of ESR (electron spin
resonance) and EPR( electron paramagnetic resonance). After, I would
like to know if there are application of these analytic techniques to

There are a variety of companies selling refurbished instruments such as
AA's, but does anyone know of a source for dead instruments?
(I've just had a Varian SpectrAA 600 die, and Varian no longer supplies
repair parts.  All I need is a dead one to strip for solenoids, boards,

I would like to know which software you recommend (preferably free but it
is not mandatory) which can do the following :
       1. plot spectroscopic data (IR, NIR spectra)
       2. compute and plot 1st and 2nd derivative of spectra

I need some sort of primer to the art of fitting simulated peaks
(gaussian, lorentzian, or a combination thereof) to spectral data.
I had some exposure to this back in the late eighties-early nineties,
when much less desktop computing power was available, and the peak

I would like to know if representing spectra either in wavelenght or
wavenumber has totally no importance or if one of the two representation
is more "adapted" to physical reallity.
I know that there is a straight inverse relation between these two units

I want to develop a quick simple method for measuring a solvent in a
waste water stream.. the solvent is a hydrocarbon fraction of alkanes
and cycloalkanes C8 to C10 and there many isomers..  It has a
solubility in water of about 1ppm.  levels of up to 200 ppm can be

meta-hydroxydiphenyl: Where can I buy this thing?
Couldn't find it in Fisher, Sigma, VWR.
philip

There is a question in Olsen's "Optical Methods of Analysis" that when
long slot burners (10 cm) were commercially made it was thought that
they might be useless for flame emission spectroscopy because of self
absorption. But this apprehension appears to be wrong. Why is this so?

I need a free program for peaks integration: i've two columns ascii file
time/mV
thanx

Can a decrease in temperature of the solution cause a blue shift in the
emission spectrum? The specific example was given of benzo[a]pyrene in
hexane, when the temperature was lowered from 25 oC to -25 oC, the
emission occured at shorter wavelengths and the fluorescence intensity

i have  dout abot how many peaks are obtained from
1,CF2H
2,13CF2h( isotope)
What is the difference between the?

I don't know what is the best way to ask this, so I'm going to say it
in my plane language.
Is it possible to change the structure of chemicals with radio
frequency..?

Is anyone aware of a GC column (preferably packed) that can be used for the
analysis of gas samples containing percent levels of hydrogen, hydrogen
bromide, and bromine?   We are using a Shimadzu GC14A gas chromatograph
which is equipped with FID and TCD detectors.

after developing a method for determining pentene in a hydrocarbon
solvent consisting mostly of octane and nonane but with alkanes present
up to C40 and above using headspace GC I have created a problem in that
the GC is also used for very low level hydrocarbon in water analysis