Polybrominated diphenyl ethers in indoor air from two typical E-waste recycling workshops in Southern China: Emission, size-distribution, gas-particle partitioning, and exposure assessment

The emission characteristics of respirable particulate matter (PM10), and polybrominated diphenyl ether (PBDE) size distribution, gas-particle partitioning and occupational exposure in two e-waste recycling workshops (manual and thermal dismantling workshop: ManuDW and TherDW) were investigated. The PM10 mass con-centration was higher but the number concentration was lower in the ManuDW than in the TherDW. The gaseous phase PBDE concentration (40.5 ng/m(3)) was higher in the ManuDW than in the TherDW (10.6 ng/m(3)) while the particulate phase PBDE concentration was just reverse (57.7 vs 156 ng/m(3)). The size distribution of particle was similar for two workshops but the size distribution of particle-bound PBDE exhibited remarkable differences. BDE-209 was the dominant congener in particle-bound PBDE in the TherDW, while Tri-, Tetra-, and Deca-BDE were the three most abundant homologues in the ManuDW. The size distribution of particle-bound PBDE homologue profile in the ManuDW was also distinct from that in the TherDW. The PBDE exposure doses were 13.9 and 15.3 ng/kg/day in the ManuDW and the TherDW, far lower than reference doses. Gaseous and particle phase have same contribution to the total doses in the ManuDW but the exposure doses in the TherDW mainly come from the particle phase.