If the activated carbon contains less than 260 ppm mercury, Federal regulations allow it to be stabilized (for example, trapped in concrete) for landfilling.

Commercial carbon also usually contains significant quantities of other elements, which may also form crystalline impurities.

We know roughly how much carbon a tonne of coal, a cubic metre of gas and a barrel of oil contain.

During this process, the carbon contained in the negative electrode sublimates because of the high-discharge temperatures.

Since essentially all sources of human food are derived from plants, the carbon that comprises our bodies contains carbon-14 at the same concentration as the atmosphere.

Thus, PFCs have properties similar to fluorocarbons (a wholly carbon and fluorine containing compound) as they are fluorocarbon derivatives.

One problem with this arrangement, especially for local telephone staffers and historians, is that the carbons of Yost's letters contain no letterheads.

Plutonium, in addition to carbon, hydrogen, nitrogen, and oxygen, contains minute quantities of several unclassi- fied elements.

All told, the researchers say, the carbon contained in them more than makes up for the discrepancy in the food supply.

For this it is necessary that the alpha carbon (the carbon closest to functional group) contains at least one hydrogen atom known as alpha hydrogen.