Natural Science Forum / Chemistry / Analytical Chemistry / May 2005

I've received a sample of waste caming from a foundry. it is a powder that
contains some lead but i was asked to determine only the amount of lead that
is not in metallic state (pure or alloy - brass). I don't know anything
else, i suppose that most of the oxydixed lead should be ...

I have a methane cylinder with two gauges.One gauge for pressure in and
other out.I attached a bottle made of steel.Pressure at which gas into
the cylinder is 40 psi.Now volume of bottle is measured and it is 978
ml.If i use boyles law I can Calculate volume of methane in bottle.

we need fresh minds to teach open minds..you get your own forum, post
images! add attachments, create your own calssRooms in the chat..come join
us
we will greet you.

Sorry to bother you about this, but I would appreciate it if
someone could give me some suggestions about where to buy
flexible tubing (outer diameter preferrably around 1.2 mm)
that has hydrophilic coating *inside* the tube.

Hi Group, Anyone have a users manual or otherwise know much about the
Perkin Elmer model 8500 GC?  Looking to abort a  run while in progress
(w/o turning off power) and how to turn off split/split relay during a
run.  Will trade my "free" analytical services (LC/MS/MS, etc). for

I picked up an AE 163 cheap and it works well except it "loses" about .01 mg
(.00001 gm) every two seconds (in the 30 gm mode).
I'm wondering if there's a leaky capacitor that I can replace, but I can't
get the case open.  It looks like there are screws I need to get to that are

I am desperate for a GC-MS protocol for detection of
1) phosphoethanolamine & palmitaldehyde
2) fatty acid hydroperoxides
I have a routine method for fatty acids, but need to look at the

I am looking for density tables of DMF and THF water solutions.
I have checked about 10 different handbooks and critical data
table books (everything that was on the shelves at my faculty
library) to no avail.

Owning up to World War II actions
By Michael Hill, Baltimore Sun Staff
Originally published April 24, 2005
In the past few weeks, China has brought new passion to an old argument

I am working on the extraction of vitamin D3 from tablets. For the
moment, we are using hexane to extract this vitamin. However, results
are not very good. I would be grateful if anyone could give me
information (references, others solvents extraction?) to improve the