Natural Science Forum / Chemistry / Analytical Chemistry / July 2004

I would like to know if posters on these scientific newsgroups can share
any FTP site(s), or HTTP sites linking to FTP or other protected sites,
including log-in names and passwords, from which chemistry and chemical
engineering and related e-books, publications and programs (not

I titrated a 0.1M NaHCO3 solution with both HCl and H2SO4 (seperately)
and after I first reach pH 7, the ph increases when I add more acid to
about pH 7.28 before abruptly returning to the regular titration
curve. What is happening here? Does the acid somehow react with the

Im in college, studying for a repeat exam in analytical spectroscopy, need
to know how to apply Job's method (also called continous variation method)
to exam questions.For example how to dermine the composition of a complex
and how to calculate the molar absorptivity using this ...

I am looking for a program  (open source or something free), to analyze
somple 2d chromatograms (i.e. peak picking) which are in an ASCII format.
Examples of such a program is Origin or Spotfire.
one catch: has to run on a mac (mac os X), so any unix based program would

I need KOH to adjust the initial pH of metal solutions for the removal
of copper ions by natural adsorbents. Copper remaining after
adsorption is analyzed by AAS after proper dilutions. What I noticed
that when I prepared same 50 ppm copper solutions of different pH (

Still working on the acid/sulfite puzzle (see postings "iodine and
sulfite in acidic medium" and "unexplained yellow color in
acid-iodine-sulfite system"). Till now, this is not yet solved.
I think I can contribute a little to the answer. It looks indeed as if

Good morning,
does anyone know publications about the dependency of Conductivity of salt
solutions from the purity of the salt?
I'm interested in NaCl and especially KCl.

whats the best analytical balance ? 0.1 mg accuracy
thanks,
E

I'm constructing Shewhart charts for some of our analysis methods and there
is this one point I'm unhappy about...
All the reference material I've read regards the mean value of a given
analyte over a period of time as the 'population mean'  and constructs the

Can anyone suggest a supplier of very small empty HPLC columns that I
can fill myself with a Sepharose resin? I'm looking at a volume of 50
to 100 microlitres.
I imagine that a guard column cartridge might do the job, but it would

WHAT ARE THE ADVANTAGES OF ONE OVER THE OTHER?

Situation:
5890 Series II GC with a TCD and a packed column.
Every now and then we get charts that the baseline (dips?) falls below the
initial baseline after our primary peaks,

For the debunking of physics see http://paradigm.blogharbor.com

As a photographer hobbyist, with some chemistry knowledge, I came
across the following 'riddle'. Besides being a photo hobbyist, I'm
also interested in chemistry. I'm just curious about what happens
here. I cannot explain it with my knowledge, one of you may be able to

I am a student in Malaysia researching the amount of sodium chloride
in Mcdonald's French Fries. I hope to carry this out through
experimentation. Does anyone know of any simple lab techniques to
quantitatively determine the amount of sodium ions in a substance?