Natural Science Forum / Chemistry / Analytical Chemistry / July 2006

I am trying to measure low-level of fluoride (hopefully below 0.01 ppm)
in a defined bacterial medium with about 400 ppm of chloride and 1000
ppm of phosphates. I would like to get some opinions about which method
is better. So far I didn't have success with either of the method.

We are trying to install Chemstation Software on a new PC (Dell not HP)
so that we can connect our two HPLCs throught the new PC. The
chemstation software is installed on the new PC, but we cannot get the
computer and instrument to communicate. We have tried to install

I want to extract the Ag from Ag(OH)2 solution waht technique I have to
go around?

Can any body explain me in detail with chemical equations and
procedures including preparation of reagents on how to determine the
assay of formaldehyde 37%by iodometry using sodium thiosulphate using
starch indicator (British Pharmacopeia method).

Is there any chemical or physical test I can perform on the oil in my
car engine to determine if it is ordinary oil or full synthetic using
materials I might find around the home?
-Robert Scott

Is there any way of measuring ion content (if possible, total ion
contents) qualitatively?
I want a quick and easy method other than ion choromatography.
Thanks in advance.

Can someone please help me explain to my boss (because he won't except
that this is just the way it is) why and how flow rate has an effect on
peak areas?
Thanks!

Clarification on earlier post:
Can someone please explain why and how flow rate has an effect on peak
areas?  A coworker is in the middle of validating a new method for the
assay of one of our products.  We have a method that works but uses an

Hello friends
I was interested in doing some fluorescence of turbid samples. In all
fluorescence book I read this topic is treated at very low level and
with no systematic approach. Do you know a book or review that can be of