Division 1.2 DEFINITIONS

Carbon transformation: is the degradation by microorganisms of organic matter to form inorganic end-product carbon dioxide.

EC_x (Effective Concentration): is the concentration of the test substance in soil that results in a x percent inhibition of carbon transformation in carbon dioxide.

EC₅₀ (Median Effective Concentration): is the concentration of test substance in soil that results in a 50 per cent inhibition of carbon transformation in carbon dioxide.