of all the milk samples analyzed , p , p'-dde concentrations were above the detection limit in 99.5 % , p , p'-ddd + p , p'-ddt in 57.9 % , isomers of hch in 30.0 % , cis-chlordane in 4.9 % , oxychlordane in 3.3 % , trans-nonachlor in 6.0 % , heptachlor in 12.0 % , and heptachlor epoxide in 6.6 % .
C0019219
heptachlor
C0019220
heptachlor epoxide