Accumulation and translocation of polybrominated diphenyl ethers into plant under multiple exposure scenarios. (October 2020)

• Record Type: Journal Article
• Authors: Zhu, Hongkai; Wang, Fei; Li, Bing; Yao, Yiming; Wang, Lei; Sun, Hongwen
• Is Part Of: Environment international. Volume 143(2020)
• Publication Date: 2020-10
• Subjects: Polybrominated diphenyl ethers -- Chamber study -- Foliar uptake -- Deposition mechanisms; Environmental protection -- Periodicals; Environmental health -- Periodicals; Environmental monitoring -- Periodicals; Environmental Monitoring -- Periodicals; Environnement -- Protection -- Périodiques; Hygiène du milieu -- Périodiques; Environnement -- Surveillance -- Périodiques; Environmental health; Environmental monitoring; Environmental protection; Periodicals; 333.705
• DOI: 10.1016/j.envint.2020.105947
• Languages: English
• ISSNs: 0160-4120

Abstract

Graphical abstract: Highlights: Chamber study was designed to study the fate of PBDEs in the soil-plant-air system. Particle-bound deposition was the principal pathway for PBDEs entering wheat leaf. Uptake and allocation processes were driven by PBDEs' physicochemical properties. Two deposition mechanisms were identified for seeking plant foliar uptake of PBDEs. Abstract: Plant foliar uptake is an essential part of the overall biogeochemical cycling of semivolatile organic compounds. Chambers were therefore designed to expose wheat to polybrominated diphenyl ethers (PBDEs) via various combinations of exposure routes (i.e., soil, air and particle). Under the simulated scenarios, most of PBDEs in wheat leaves originated from foliar uptake (including gaseous and particle-bound depositions) rather than translocation from root uptake. Our results further revealed that higher brominated PBDEs ( h -PBDEs; i.e. hepta- through deca-BDEs) were inclined to enter wheat leaves via particle-bound deposition while gaseous deposition could not be ignored for less-brominated PBDEs ( l -PBDEs; i.e., tri- through hexa-BDEs). Sequential extraction of wheat leaf displayed that the transfer velocities of h -PBDEs were lagged behind l -PBDEs during their deposition to leaf cuticle and subsequent erosion to mesophyll, where a large fraction of the target chemicals were ultimately stored (29–93% of total PBDEs burden). Applying McLachlan's framework to our data suggested that the uptake of PBDEs was controlled primarily by kinetically limited gaseous deposition for l -PBDEs and by particle-bound deposition for h -PBDEs. The combined use of exposure chamber measurement and framework provides a robust tool for interpreting the behaviors of PBDEs between the atmosphere and plant foliage.