Natural Science Forum / Chemistry / Analytical Chemistry / April 2006

http://users.accesscomm.ca/john/iwin4.GIF
Look at the above picture.
Using my model for the atom, I can do the same thing with
every atom and molecule.

I though i made a 80% and 40% aqueous phenol solution (newly opened
solid phenol with 18.2 Mohm water). The former is colorless while the
latter is whittish which partitions into two layers upon standing. Does
this sound right or did i screw up?

using an Agilent 5973 ms with 6890 gc
EST Encon concentrator with Archon 8100 model autosampler running a
soil method.
Currently my MDL studies for this instrument setup are yeilding failing

GC: HP 6890 /Agilent
MS: HP 5973 / Agilent
Hello,
Internal standard responses are deteriorating throughout the run.

My name is George.  I'm not a chemist, but I've worked for a
startup bioengineering company for 5 years and I've taken general
chem.
I'm a computer engineer by profession, specializing in robotics used

what is the purpose of adding Barium nitrate solid?
what effect would the presence of 1M ammonia have on the above
titration?Be specific in your answer.
THX~

Dear sir,
I just need help to know that what type of pump oil can be used in High
pressure pump to get better result. I need the name and from where i
can purchase this oil.

suppose that you have to sample a solution of a solute X present at C
concentration, by means of very small volumes (let's say 1 um^3).
Suppose that you can take 10^6 samples...
what is the distribution of

does anyone know something about "cyclic stoichiometry"? I have read
this in an article about the book of Ganti "Chemoton"

The standard deviation is supposed to be calculated with N-1 for
samples and N for the population.
However, in analytical chemistry the population is practically always
indefinite because there is an indefinite number of possible

I was looking for any help out there from anyone who may have switched
from gas chlorine to liquid. I am at a wastewater treatment facility an
we are going through a retro changeover. We have recently switched to
liquid an our coliforms are through the roof. If you have any ideas on

Hi every one
My lab is planing to buy the entire years supply of columns this month
, I was wondering if there is any harm in doing this? Columns don't
have a shelf life..... but dose their performance decay on prolonged

I would like to have some advise on which gc ms system to buy
please help i'm a newby on ms, with lots of experience on GC
Thanks

Somebody please enlighten me here:
I was reading the EPA Methods for metals digestion. (I run an AA
furnace.) Now, the method says to take your sample (say, 50 ml) and add
3 ml of conc HNO3... and then another 3 ml of conc HNO3... and then a

I work for a large company in a laboratory. One of the analyses we do
is pyrolysis- GC-MS of polymers. At the moment we are replacing an old
GC-MS.
We are investigating several suppliers of GC-MS instruments. One of