Natural Science Forum / Chemistry / Analytical Chemistry / January 2004

If I want to use PHREEQC-2 to calculate with forms of phosphate (=
hydroxyapatite, amorfous calcium phosphate, octa calcium phosphate,
dicalcium phosphate dihydrate) will precipitate in a range from pH = 7
to pH = 10, T = 25°C in waste water.  What do I have to give in to get

Has anyone else seen problems with measuring V by ICP-MS?  Specifically, the
numbers tend to start out fine (cal verifications and QC checks) but the
numbers tend to rise consistently as the run goes on.  By the end of a
standard ~20 sample run the numbers are way outside of QC ...

I am trying to look at different slants to this question and I would like
some input from anyone out there who would like to.
One idea is that if an AC bias is applied to a cell (such as one with two
copper electrodes and de-ionised water) then Under AC an ion will move back

But Siriusly, folks ... The Neofiles Interview
R.U. Sirius, who has an impressive track record of spotting cultural and
technological trends years before the rest of the media pick up on it,
has posted an interview with me on his neofiles Webzine. Mr. Sirius gave

I need a information how to prepare phosphate buffer from phosphoric
acid and natrium hydroxide with pH 2,8; 3,3; 3,8; 4,3; 4,8; 5,3; and
5,8. The ionic strength must be 0,01M.
There are many instruction how to prepare phosphate buffers, but no

We are looking to purchase new and/or used platinum crucibles.
Any amount will do small or large.
we will pay $10 to $14 per gram depending on purity.
email me at Rinnycoop@aol.com

I bought some pills of a rather expensive drug at a discount pharmacy
and before purchasing more wanted to verify the composition of the
pills.  Are there businesses that perform this type of testing?  Is it
expensive?

I would like to convert a couple of pH meters that serve as monitoring
devices for caustic scrubbers to conducivity.  The scrubbing solution
is 25% caustic when it is initial placed in the scrubber, which
basically kills any type of pH meter relatively quickly.  Someone

Uncle Stewart wrote (using short lines in the
vain anticipation of garnering numerous responses):
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BEGIN TEXT OF STEWART POST

I have to determine concentration of phosporic acid for school.
I have to titrate H3Po4 with NaOH, indicator phenolphtalein and I had to add
10g of Nacl to the solution of H3Po4. But why do i have to add the Nacl?
Thanks for any help!,

I work for a company that builds moisture analyzers. I am more of an
instrumentation guy than numerical analysis, so am having trouble
making some sense of some data.
The experiment goes like this - we flow nitrogen at 1 slpm which

http://www-ilo-mirror.cornell.edu/public/english/protection/safework/cis/product
s/icsc/dtasht/_icsc02/icsc0232.htm
http://tinyurl.com/2kpst
I have found this internet site and they call butane that is normally in
gaseous form a liquified gas.

I am looking for a chemical or another means that will completely
remove wax that have been rubbed onto paper. The chemical should leave
no stain or residue because I will be brushing on coloured ink over
the previously waxed area. So the paper must be able to re-absorb

There is a Beckman 35 UV/Vis spectrophotometer coming up at a local
auction. It appears to be in pretty good shape (was used at the local
university). There is no manual with it. The unit comes with both the
spectrophotometer portion, and a chart recorder that is interfaced and

Does anybody knows the HLB of Lannete SX?
Thanks in advance