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This work applied the radiotracer technique to evaluate the chromium (Cr) sorption by sediments of a mangrove degraded area under reforestation phase. The radiotracer 51 Cr(III) was used to assess the removal kinetics of this metal from tidal water by underlying sediments in two different environments from the mangrove area of the reserve Parque Natural Municipal Barão de Mauá (Rio de Janeiro, SE Brazil). The results indicated a faster Cr(III) removal by sediments from the area with initial mangrove reforestation (t1/2 = 12.1 ± 0.1 h) than estimated for the area with older mangrove reforestation (t1/2 = 18.0 ± 0.2 h). However, this difference was explained by a stronger sediment bioturbation in the area that presented faster Cr removal (the initial mangrove reforestation zone). These results evidence the importance of the influence of biological activity in the capacity of the mangrove sediment to remove Cr(III) from tidal waters.