Natural Science Forum / Chemistry / Analytical Chemistry / December 2006

can anyone help me to know for the formula to calculate the molar
volume of solids.
Thanks in advance ..
looking forward for u r valuable suggestions ..

Hello, everyone
I have a big problem to analyze  polymer additives with HPLC.
I would like to know how to extract additives(ex.anti-oxidants) from
Polyethylene and Polypropylene pellets.

I am stumped about one of the Agilent machines I am working with.  I am
using dftpp as tuning chemical, but ion number 51 and 69 keeps
failing....I cant figure out why.  I tried the typical adjustment of
peak width/ masses.  I am stumped, does anyone have any idea to how to

I know there are electrochemical instruments that can do this but are there
any chemical methods eg bubbling the gas through a reagent etc that would be
able to measure oxygen in ethylene down to the ppb level.?
terry