The two most widely used brominated flame retardants (BFRs), decabromodiphenyl ether (BDE209) and tetrabromobisphenol A (TBBPA), co-exist prevalently with heavy metals (HM), at e-waste recycling sites (EWRSs). The laboratory incubation we conducted, which 50 g of dried soil spiked with Pb, Cd, BDE209 and TBBPA, were incubated 180 d in the dark at 25°C, and kept the soil moisture at 60%. The results demonstrated that the inhibition ratio of 4 kinds of the enzyme (catalase, dehydrogenase, polyphenol oxidase and urease) in the combined of BFRs and HMs treatments were -127% -66%, -72% -49%, -52% -76% and 54% -107% respectively, and in TBBPA or BDE209 contaminant treatments were -135% -18%, -16% -31%, -18% -15% and -17% -83% respectively. Urease was more sensitive to the combined contamination than catalase, dehydrogenase and Polyphenol oxidase. BDE209 exhibited a higher eco-toxicological potential to soil enzymatic activity than TBBPA. The co-existence of
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