Parameter Tree:
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE ELEMENTS/TRACE METALS

Definition:
Trace elements are elements that occur in minute quantities. Trace elements
can include copper, silicon, cobalt, iron, zinc, iodine, and manganese.
 


Reference:
Porteous, A. 1996. Dictionary of Environmental Science and Technology, 2nd ed.
John Wiley and Sons, NY.