Natural Science Forum / Chemistry / Analytical Chemistry / November 2003

Just found a meteor in my garden, maybe there are alien elements
inside, so how can I analyse it ?
Maybe it´s dangerous and I could nuke myself???

I want some basic information about DM water and is that the industrial water?

I am having a dispute with colleagues about FeO titrations with potassium
dichromate.I believe the presence of Fe is necessary (along with phosphoric
acid) for the indicator barium diphenylamine sulphonate to work. Hence the
addition of a small quantity of Fe to both blank and ...

Years ago I worked in an environmental lab doing hi-res GC/MS analysis.  I
vaguely remember a document, I think from the EPA, that specified a limit to
the amount of smoothing that could be applied to chromatographic data prior
to measuring areas and signal to noise.  This wasn't ...

Regarding the properties of metals...
I have forgotten why metals conduct electricity in terms of the
quantum theory; bonding orbitals and antibonding orbitals.
In terms of quantum theory is it possible that an ion exist as a

Does anyone here have any real-time, practical experience with the use of
chemiluminescent nitrogen detectors?  I am particularly interested in how
accurate their touted quantitative capabilities are.
I would like to sample from an LC stream (water/methanol/TFA), which would

I wonder, is it possible to use (successfuly :-)) Dionex suppressor with
Shimatzu ionic chromatograph?
Please, if someone has experience with this instrumantation share it.
Thanks

I am working on a steroid which has very polar metabolites (for which
we do not have ref. standards) generated in-vivo and in-vitro
biological systems. using a RP-18 15 cm column they elute at 2-3 min
(using 3H-labelled compound) in the solvent front along with

I would like to know if there is any freeware/cheap software for
converting 2D ASCII (time/signal) into *.cdf format
I have tried to go through all the Unidata website, but my knowledge
of informatics is near zero

has anyone ever use silver nitrate to precipitate chloride in determining
chloride concentration using spectrophotometer?
What are the things to watch out for? Is it acceptable to be used in low
range analysis, in ppb level?

where can I find the chemical structure of this food supplement?
Any link concerning the chemistry is welcome.
Peter

I have extracted Carotene from variously prepared Carrots using
tetrahydrofuran:methanol 1:1. What is the easiest way to gague the
concentration of this mixture? I have attempted:
- Colourimetery

hi colleagues,
where can we purchase a "methanizer" to convert CO in a gc effluent in CH4,
witch can be detected by a fid? Can this device connected to agilent 5890 II
gc/fid?

I,m searching for a manual for a HP5890A GC, and where can i find a 'cheap'
copy of
chemstation software for this machine.
Thanks

Could someone help me with an adapted procedure for Fe & Se
determination in a ferro selenium alloy.
I'm particularly interrested for sample digestion protocols/advices.
Thanks in advance