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•  Sum  levels  of  the  four  isomers  were  0.02-0.2  ng/g  dw  in  sediments  from  New
Zealand  (Simpson  et  al.,  1996).  Heptachlor  was  non-detectable.  Mekong  sediments
from  Vietnam  contained  0.02-0.34  ng/g  dw  of  /ran.s-nonachlor,  <  0.02-0.14  ng/g  dw
of  /ran.s'-chlordane  and  0.02  to  0.36  ng/g  dw  of  c/.s-chlordanc  (Hung  et  al.,  2004).