Natural Science Forum / Chemistry / Analytical Chemistry / November 2004

I am having a bit of trouble with a question in my homework, and I
would like to do well on my final. I would really appreciate any help.
Here is the question:
10. The threshold/NOEL level found for a particular chemical from

Can any one help me with a spectrophotometic method for the
quantitative analysis of 2-hydroxy citric acid?

I'm looking for a quantitative method for determining DiSodium EDTA by
HPLC using a UV detector.
I currently have reverse phase columns available.  
I'd like to be able to construct a standard curve with milli-Molar

Before eating them, I must analyze them for toxic chemicals.
How can I analyze doughnuts and could there be harzardrous chemicals inside them?

Is bias of an analytical determiantion to be included as a contribution to
measurement uncertainty (budget), since it is not a random error?
Tardus

I have not posted here before, so I feel I must introduce myself. I am
a student at Oregon State University. I am enrolled in a chemistry
class, and the term is alomost over. There is a problem I do not know
how to do, and it is posted below:

I need to measure thickness of thin (couple of nanometers) silica film
on a reflective metal substrate.
I wonder if I could use IR in total external reflection configuration.
If I knew absorbency coefficient for most intense bands (~1230 cm-1)

Does anyone know of a good piece of software that can be used for design of
experiment (DOE) as it relates to the validation of analytical methodology?
Thanks all.

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I have several bottles of calibration gas for portable O2, H2S and LEL
meters.  Some of the bottles have expiration dates, particularly the
H2S bottles.  All of these bottles contain a nitrogen balance.  The
H2S is 10ppm, and I also have 1.45% methane with 15% O2.  These are

Does anyone know a software that can be used for drawing glassware apparats?
I have searched on the net without relevant results!
Thanks
Eligio

Hello, I have to interface a balance SARTORIUS BP310S with a computer
and I look for the user manual of this balance. If somebody has this
balance in its lab, can it scan me the user manual.
Thank you.