Natural Science Forum / Chemistry / Analytical Chemistry / February 2004

I have a problem to determine quantity of phenonip in an W/O emulsion. I
tried to extract it with 0,02M NaoH in methanol, but even identification was
not possible. Apart from phenonip, in the emulsion I have Tocopherol Acetat,
Almond oil, Paraffin liq., Glycerol and emulsifiers ...

Most pH-buffer solutions have (nearly) the same pH after evaporation
of some water. Tris buffers (Tris-(hydroxymethyl)-methylamine) however
increase in pH when water evaporates. What I'm searching for is a
buffer (approx pH 8) that decreases (to approx 6.5) in pH when water

New site at Yahoo groups.  This is it intro.
This is an attempt to boost this science domain and highlight the exciting
advances happening in electrochemistry, such as nano-wire growing,
reliability analysis in the electronics industry (dendrites, CAF,

I am a research student and was wondering if anyone could help me with
a quick summary of the detection limits of the various analytical
methods I am considering using.
Thank you to anyone who replies.

Hello everybody,
Is there any background data of FTIR spectroscopy (bands +
assignments)on carbon-nanotubes (both multi and single walled)
I'm pretty desperate and will compromise with anything:

I've been searching for an Ammonium color indicator that is not just a
pH indicator! It shall be used in a buffed solution (pH approx 6.7)
together with an enzyme reaction. Does any one know about such an
indicator?

Greetings, all - I have a PE DSC7 with a few problems. It seems the
baseline adjustments are maxed out and the baseline is still inclined
and curved. I have used this baseline and had luck with the Zinc and
Indium standards (flat traces and clear peaks). Runs with polymers have

How can I analyze urine ? I think there is something in the urine that is bad.