ABSTRACT
Heptachlor epoxide is not produced commercially, but rather is formed by the chemical and biological transformation of heptachlor in the environment. Heptachlor epoxide that is associated with particulate matter and aerosols should be subject to gravitational settling and washout by rain. Based upon the vapor pressure, heptachlor epoxide is expected to exist in both the vapor and particulate phases in ambient air. The partition constant of heptachlor epoxide to bentonite clay is 100. Heptachlor epoxide residues were found in commercially prepared baby foods that were sampled from July 1963 to June 1967 with a frequency of detection of 0.9% for 684 samples. Heptachlor epoxide was detected in double-crested cormorant collected in Atlantic Canada during 1968 to 1984 at concentrations ranging from undetected levels to 0.09 ppm. Heptachlor epoxide residue was found in Canadian evaporated milk at a concentration of 5.00 ug/L on fat basis.
