Natural Science Forum / Chemistry / Analytical Chemistry / October 2003

What would be the cheapest way to measure Oxygen content of a room and what
would be the most reliable ?

Is there any readily available household substance that will react with N2
gas to produce a color change ? or any other substance that reacts with N2
to produce a visible change ?

 Does anybody have some references (reviews/books/websites) dealing
with  the data analysis of chromatograms . I am looking for an overview
of all the statistical approaches used in GC-MS or LC-MS.
       Thanks in advance.

I am doing my testing on oyster flavoring to determine the content of Tin
(Sn).
My sample preparation is using HNO3 with Microwave Digestion.
I will be using ICP OES.

The Bottom Line for Shimadzu
....Shimadzu's bottom line is NOT healthy!
The end of this fiscal year (31 March 2003) for Shimadzu Corporation
is an excellent time to sum up the results in lost sales which

i am trying to separate Dopamine and DOPAC from superfused brains.
one of the machines has a problem.
after changing the analytical cell, it has very low senstivity for
Dopamine .... anything less than 20 thousand pg is not detectable.

I was reading a chapter in a book (Analytical Instrumentation) in
which it mentioned that the intensity of light emitted by the
chemiluminescence reaction between NO and Ozone increased by about 2 %
for each degree C temperature change in the reaction cell. Can anyone

telkom,
What would be the cheapest , odorless gas available ? i am just asking for
possible suggestions, from knowledgeable persons.

I am considering a hypothetical question. Lets say there was a terrorist
attack on building using an unknown gas,
possibly an odorless asphyxiant or something. How could a person determine
what the gas was ? would one need expensive equipment or are their simple

why is mobile phase degassed, buffered and contain 150 mM KCL?

I recently performed a paper chromatography lab that separated Fe, Cu,
and Ni ions from one another.  In order to see the Ni you had to treat
the paper with dimethylgloxime solution.  This formed a new red
compound.  The Cu was developed by exposing the paper to the vapors of

Wondered if anyone knows of a simple test for determining the amount
of selenium in tap water?
I have a access to basic equipment including a spectrophotometer,
burettes etc.etc.

Does anyone has a good method or reference to separate amino acids
(valine) by using a simple HPLC device ?
Thanks
Christophe

Please forward these message to your  Chinese fellows, Taiwanese, as
well as people from Hong Kong., Macao.  Thank you for your kind help.
Attention to Chinese Student and Scholars studying aboard, some DaLai
Lama,  Lama monks from Tibet, monks from Mainland China, Hong Kong,