Riverine transport dynamics of PBDEs and OPFRs within a typical e-waste recycling zone: Implications for sink-source interconversion.
Water Res
; 220: 118677, 2022 Jul 15.
Article
in En
| MEDLINE
| ID: mdl-35667171
ABSTRACT
Despite ample evidence on spreading of e-waste derived hazardous materials, riverine transport of organic contaminants from e-waste recycling zones to surrounding areas has not been evaluated. To address this issue, passive and grab sampling methods were used to assess sediment-water diffusion and horizontal transport of polybrominated diphenyl ethers (PBDEs) and organophosphorus flame retardant (OPFRs) at upstream and downstream sites of two rivers in a typical e-waste recycling zone. Sediment acted as a source of BDE-17 with fluxes of 0.007-0.04 ng m-2 d-1 at all sampling sites. BDE-47 and BDE-99 reached equilibrium between overlying water and sediment porewater. Sediment interconverted from a sink at the upstream site to a source of OPFRs at the downstream site with a flux varying between -7.3 and 234 ng m-2 d-1. The amounts of OPFRs (11-45 g d-1) via horizontal riverine transport were greater than those of PBDEs (0.68-2 g d-1). The vertical sediment-water diffusion of PBDEs and OPFRs was not significant compared to horizontal riverine transport. The annual riverine outputs of PBDEs and OPFRs from the downstream sites were 250-330 g and 12,000-16,500 g, respectively, indicating the significance of riverine transport of organic contaminants from e-waste recycling zones to surrounding areas.
Key words
Full text:
1
Collection:
01-internacional
Health context:
2_ODS3
Database:
MEDLINE
Main subject:
Electronic Waste
/
Flame Retardants
Country/Region as subject:
Asia
Language:
En
Journal:
Water Res
Year:
2022
Document type:
Article