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Principal component analysis of BFR concentration in biosolids/soil time series samples and their physical/chemical properties (octanol-water partition coefficient, solubility, molecular weight, and vapor pressure). Congeners of PBDEs are grouped together according to the degree of bromination (Br2 – dibrominated BDE through Br10 – decabrominated BDE). The highlighted circles represent the cluster of compounds that correlate with each other.
