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Registered Member #3271
Joined: Mon Oct 04 2010, 02:29AM
Location: Canada
Posts: 159
@Bored Chemist: "of course, most of the mercury in the gas will be lost through the flue". How about the behaviour of mercury in the flame?
In a furnace the house air is kept separate from the gas burners by a heat exchanger. And even if the heat exchanger had some small holes in it, the blower fan generates a positive pressure that would blow the air in the combustion chamber side. So, in theory, all the mercury should be blown via the cheminy to the outside.
On the other hand what about cooking? The mercury is now part of the flame and this would be quite different from the calculation of liquid mercury in a natural gas atmosphere. I would think the mercury could react at high temperature and slowly deposit on the surrounding objects , oxidised or bound?
Registered Member #3272
Joined: Mon Oct 04 2010, 11:40PM
Location: Beaverton, OR
Posts: 101
Mercury also has a rather short biological half life. I think it is somewhere around 15 days. Your body does expel it.
In general the fear over mercury is over-hyped, especially metallic mercury. It is the methyl mercury that will get you. Same thing with lead, it's not the metal that will kill you, it is the compounds.
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
richnormand wrote ...
@Bored Chemist: "of course, most of the mercury in the gas will be lost through the flue". How about the behaviour of mercury in the flame?
In a furnace the house air is kept separate from the gas burners by a heat exchanger. And even if the heat exchanger had some small holes in it, the blower fan generates a positive pressure that would blow the air in the combustion chamber side. So, in theory, all the mercury should be blown via the cheminy to the outside.
On the other hand what about cooking? The mercury is now part of the flame and this would be quite different from the calculation of liquid mercury in a natural gas atmosphere. I would think the mercury could react at high temperature and slowly deposit on the surrounding objects , oxidised or bound?
PS richnormand: "not a chemist"
I said "most" for a reason. I'm pretty sure that most people use more gas for heating than for cooking. Mercury vapour in the fuel gas is more than likely to end up as mercury vapour in the exhaust steam too. As I said, even if you were breathing that undiluted, the lack of oxygen would kill you before the mercury.
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Mercury in natural gas?