| orographic cold-trapping of persistent organic pollutants by vegetation in mountains of western canada. | conifer needles from mountain areas of alberta and british columbia, canada, were collected from sites that ranged in altitude from 770 to 2200 masl and were analyzed for polychlorinated biphenyls (pcbs) and organochlorine pesticides (ocs) to determine if they are progressively concentrated in colder, more elevated mountain areas, where temperatures decrease as elevation increases. concentrations of ocs in needles ranged from 43 to 2430 pg g(-1), 55-17500 pg g(-1), and 11-2930 pg g(-1) (dry weig ... | 2003 | 12564889 |