Re: Black dust on TV screens

From: jacques jedwab (jjedwab_at_ulb.ac.be)
Date: 11/16/04 

Date: 16 Nov 2004 13:49:02 GMT

There is no such place on earth which is enough "remote" from carbonaceous
man-made particles: if you have open air, you have particles.

Local meteorological stations measure "solids suspended in atmosphere" on
a daily or weekly basis.

If you have an access to an optical microscope, you could expose a glass
slide covered with immersion oil for a week or so, then put a cover glass,
and examine. You should see black particles, in addition to the pollen
grains, etc.

If you collect in-doors, you will get tremendous amounts of fibers.

J.J.

In article <1100598178.202833.93720@c13g2000cwb.googlegroups.com>,
farooq_w@hotmail.com wrote:

> Whenever I wipe the TV screen with a tissue, the collected dust is
> almost *carbon* black. Initially I thought it was carbon from cars that
> was attracted to charged TV screen, but this area is very clean where
> very few cars pass by and there is no heavy traffic. Someone suggested:
> http://www.madsci.org/posts/archives/Feb2003/1045667618.Ph.r.html that
> it is the metallic oxide (mainly iron- don't say it is slighlty
> radioactive) which is attracted to the TV screen, the organic dust
> blows away. To test this hypothesis at home, I dipped the tissue
> containing much black dust collected over a period in boiling vinegar
> (the only acid available at home) but there was no sign of dust
> dissolving in it, and there was no color change, and simple test to add
> NaOH (made from lime water and baking soda) there was no trace of
> precipitation or tubidity of any kind, the solution remianed very
> clear. Boiling vinegar acid is strong enough to dissolve oxides from
> copper wires or iron oxides and even some steel wool dissolves in the
> presence of hydrogen peroxide? Any suggestions why the dust did not
> dissolve. Better the dust could have been digested in aqua regia and
> analysed on AAS.

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