iandol on thu 19 oct 00
I think the first thing to do is to set the chemistry straight. My =
references are Greenwood and Earnshaw, 1998 and Levine et al 1979.
Manganese Dioxide decomposes to give Oxygen and Mn304 at about 530 deg =
Celsius, 986 F.
Levine et al give several values of the melting point of Mn3O4 between =
1557 and 1701. I suppose it depends on the method used to determine the =
value.
There has been very little published in the common tabloid press or =
mentioned on TV news about the replacement of Tetra Ethyl Lead by other =
Volatile Organometallic compounds in the formulation of Lead Replacement =
Gasoline for older automobiles. Whatever is used as a replacement has to =
form a vapour as it passes through the carburettor mixed with the =
gasoline. It is the residue of a volatile Organometallic Manganese =
compound which comes out of the exhaust which is the worry. In the posts =
so far, this is presumed to be Manganese dioxide. If the auto is burning =
a rich mixture, might it not be in the form of Manganese Carbonyl?
If I may be permitted an observation about the use of Chemical Terms in =
the ClayArt files, it is frequently, to say the least, sloppy. Imprecise =
use of technical words leads to confusion in the mind of the reader and =
may lead to erroneous conceptions to the extent that falsehoods are then =
accepted as valid facts. A little proof reading and editing before =
flattening the Send Key might be considered advantageous.
Ivor Lewis. Redhill, South Australia
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