“…Many of those compounds are of environmental concern due to their production quantities, toxicity, persistence, and tendency to bioaccumulate (Schwarzenbach, Gschwend, & Imboden, 1993DeCaprio, 1997;Eganhouse, 1997;Takada et al, 1997;Aboul-Kassim & Simoneit, 2001). They can enter the hydrosphere (Hites, 1973(Hites, , 1977Lopez-Avila & Hites, 1980;Poiger et al, 1996;Leeming et al, 1997;Suter et al, 1997Suter et al, , 1999Simonich et al, 2000), atmosphere (Atlas et al, 1993;Baker & Hites, 1997;Hillery, Basu, & Hites, 1997;Strandberg et al, 2001;Whiteaker & Prather, 2003), geosphere into soils and sediments (Hom et al, 1974;Eglinton, Simoneit, & Zoro, 1975;Beller & Simoneit, 1986, 1988Kumata, Takada, & Ogura, 1997;Reiser, Toljander, & Giger, 1997;Stoll et al, 1997;Rogge, Medeiros, & Simoneit, 2004a-c), and up the food chain in biota (Risebrough et al, 1967;Bowes et al, 1973;Goldberg et al, 1978;Spitzer et al, 1978;Jarman et al, 1992Jarman et al, , 1993Simonich & Hites, 1995a). These applications of MS will keep increasing as more problems become evident, and as the sensitivities of the instrumental methods increase to ever-improved detection limits.…”