Natural Science Forum / Chemistry / Analytical Chemistry / December 2004

How do you call in English the steepest part of the titration curve
(defined as endpoint +/- 0.1%)? In Polish it is a "curve jump" but does
it have any English name?
Best,

I am going to do the exposure experiments with Cd and radioactive
calcium. And I want to determin Cd concentration in water as well as in
tissue sample with AAS. But I hear that it would cause contamination to
the equipment and it will be difficult to clean it up after that. Is

I fear that Christmas trees are full of toxic chemicals and toxic
trees are not allowed in my house.
So how can I analyze a Christmas tree?

What are the difficulties of Gas Chromatography and Flame Ionisation
Detection?

I inherited a process whereby a cuvette cleaner (looks like a beaker
washer on an erlenmeyer flask)is used once a week to "really clean" the
cuvette (with a jet of DI water).  This is an all-aqueous process, very
soluble.  I'm the only chemist in the area - the folks running the

I'm looking for methods to determine total fluorosilicic acid (About
9%) in a new elecrtorefining process we're starting. Also, I'll need
to run imputities by ICP. I 'assume' I can just do a NaOH titration
with phenolphthalein, and dilute the samples for ICP. Any and all

you are one sad individual, if you didn't know the answer why did you respond?
I suggest you get yourself off to councilling while there is still time.
Muser

I am getting odd results measuring the weight of a litre of vodka. It
is 40% by volume alcohol. 400ml of grain alcohol has a specific gravity
of 0.79 and should weigh 916gms. The remaing 600ml (99.9% water) should
weigh 600gms giving a total of 916gms. I consistently get about ...

Can anyone tell me what receptors in the brain dopamine effect, and
serotonin for that matter. What gland or area of the brain secretes
serotonin and dopamine?

I am employing a polarographic sensor for DO measurement in yeast
fermentations. My work involves use of hydrogen peroxide in yeast
cultivation. The DO sensor is a platinum cathode and silver anode with
KCl/KOH as the electrolyte (pH 13). I would like to know whether

I'm searching information about something of analytical chemistry: about
labs, experiments or something.
I preffer in spanish, but in english would be ok.
thanks for everything,

Can anyone tell me why I have to use either polycarbonate or cellulose
acetate membrane filter for filtering water in trace metel analyis (let
say, Cd)? I have red Standard Method for Water and Waste´Water
analysis from APHA and other literature souces. They all suggested me

I'm wondering whether anyone else out there has experienced
artifacts/memory effects in chromatographic grade stainless steel
tubing when analyzing for volatile hydrocarbons.  Specifically, running
blanks (UHP He) through the system (a home-made cryogenic

This communication originally appeared November 1st, 1999
(It applies to people posing under pseudonyms like George Orwell)
Shimadzu Instructed to Cease and Desist
TO: Shimadzu Corporation (and all corporate subsidiaries worldwide)

The Bottom Line for Shimadzu
....Shimadzu's bottom line is NOT healthy!
The end of this fiscal year (31 March 2004) for Shimadzu Corporation
is an excellent time to sum up the results in lost sales which