Natural Science Forum / Chemistry / Analytical Chemistry / September 2005

I am going to determine heavy metals in the shells of bivalve mollusc
but so far I have so little information about the method to do it. If
anyone knows the sources of literatures about this line of work,
especially sample preparation, please provide me some.

We're looking to purchase a triple quad GC-MS system. We're considering  the
Micromass Quattro Micro and the Varian 3200L(?). Does anyone have any
recommendations/warning on either of these, or any other systems we should
consider.

I have two types of samples of which I have to determine the tin
content (<1% in all cases).
Type 1 is metallic lead with some tin content, mixed with aluminium
oxide.

We currently have a Philips SEM Model CM120 in one of the rooms of our
laboratory and we need the additional desk space.  Is it safe to have
the workers in our lab sit next to this machine all day if the machine
is rarely used? Is it safe to sit next to this machine all day if the

A UFO recently crashed into my barn and I want to analyze the parts I found.
What do I need to analyze materials that were created by aliens from outer space ???

I was wondering if anyone uses Jade particularly Jade 7 as an
analytical tool.
More specifically I was wondering if anyone was familiar with how to
analyze compounds with multiple phases. I am also interested in

There is tutorial
and manual and document Introduction for Polarography and Voltammetry
there www.polarograph.com:
Electrochemistry Software POLAROGRAPH.com 5.4

hai,
what normally r limit of detection for all individual PCBs in GC-ECD?

Howdy:
I would like to get your expert opinions in this scenario:
In our lab, we used old HPLC system to conduct analysis of a sample. We
also captured raw data and other associated files like chromatograms

I am curious about the price of hydroxylammonium.
Is there a chemical compnay anybody can suggest?

Can any inorganic alcohol -or a fuel similar to ethanol- be made from
chemical compounds not derived from petroleum nor biomass ?

I have problem with our wax base lipstick sample prep. there are 4
organic sunscreens in product. I used Hexane to disperse the sample and
methanol to dissolve the sunscreens. But recovery is poor, around 60%
or so. Compare to liquid makeup product, I have 100% recovery.

what is the difference between uv detector and PDA detector?

Newsgroups: sci.techniques.mass-spec
Date: 16 Apr 2005 18:08:48 -0700
Hi everyone,
I measure atmospheric gases (N2, Ar, O2) in

Does anyone know a method or series of methods for determination of
cations like arsenic, lead, cadmium, chromium; anions like chloride and
halogens and PCB using HPLC? I have liquid petroleum sample and I need
to determine qualitatively and quantitatively existance of those