Optimization of Sample Pretreatment based on Graphene Oxide Dispersed Acid Silica Gel for Determination of Polybrominated Diphenyl Ethers in Vegetables near an E-waste Recycling Plant.

Polybrominated diphenyl ethers (PBDEs) derived from e-waste dismantling, tend to easily bioaccumulate in vegetables. In this study, an optimized sample pretreatment method based on graphene oxide (GO) dispersed acid silica gel was used to determine PBDEs levels in vegetables. The recovery efficiency of the optimized method ranged between 90.3%-107.5% with the detection limit (LOD) being within 0.17-1.8 ng g-1. Vegetable samples were grown nearby an e-waste recycling plant in Nanjing, China, and analyzed using the optimized method. The concentrations of ΣPBDEs in the samples ranged from 12.1 to 20.1 ng g-1. This study developed an optimized sample pretreatment method to determine PBDEs in vegetables nearby e-waste contaminated sites and provides insights on the potential risks derived from e-waste dismantling to the surrounding environment.