'carbon content' is correct and usable in written English.
You can use it to describe the amount of carbon in a material or substance. For example, "The carbon content of this coal sample is quite low."
Natural gas has a relatively low carbon content.
He displayed a chart of known fossil-fuel reserves represented in terms of their carbon content.
They are tested for carbon content and payment is made if there is an improvement.
They will increasingly ask about the carbon content of their food".
Steel, alloy of iron and carbon in which the carbon content ranges up to 2 percent (with a higher carbon content, the material is defined as cast iron).
The obvious way would be to set a tariff based on the carbon content of imports.
Adjusting the carbon content is the simplest way to change the mechanical properties of steel.
Knowing what the carbon content of imports actually is would be tough.
wt % Carbon content (XPS).
Soil microbial biomass carbon content.
The minimum carbon content is 1.8%%.
