A one way ANOVA of ΣOP, ΣPBDE (the sum of about 35 congeners), TBB, and TBPH concentrations at each site showed that ΣOP concentrations are consistently higher (P < 0.001) at all five Great Lakes sites compared to the corresponding ΣPBDE, TBB, and TBPH concentrations at the same sites. In fact, ΣOP concentrations are about 100, 1200, and 600 times higher (on average) than the concentrations of ΣPBDEs, TBB, and TBPH, respectively. In other words, ΣOP concentrations are on average about 2-3 orders of magnitude higher than the concentrations of brominated flame retardants (PBDEs, TBB, TBPH) in the Great Lakes basin.

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