Aniline is a toxic organic compound consisting of a phenyl group attached to an amino group. It is the prototypical aromatic amine. Aniline and its derivatives are very important for the synthesis of chemical products such as dyes, resins, and medicines. The main use of aniline is in the manufacture of precursors to polyurethane. Aniline is a carcinogen that is considered to induce tumors secondary to hemosiderosis as a consequence of methemoglobinemia. Aniline is classified as Group 3, not classifiable as to its carcinogenicity in humans (IARC, 480 1987b). Aniline occurs naturally in some foods (i.e., corn, grains, beans, and tea), but the larger source of exposure is in industrial settings. Lifetime permissible daily exposure (PDE) for aniline is 720 ug/day. Simple anilines such as aniline and monosubstituted anilines are known to disappear from the environment mainly via biodegradation.