Bisphenol analogues in water and sediment from the Beibu Gulf, South China Sea: Occurrence, partitioning and risk assessment

Bisphenol analogues (BPs) have gained increasing attention in recent years due to their ubiquitousness in the environ-ment, potential endocrine disrupting properties and ecological impacts. However, very little information is available on the occurrence, partitioning and ecological risks of BPs in marine environments. In the present study, six BPs were investigated in surface water and sediment samples from the Beibu Gulf, South China Sea. Results showed that bisphenol A (BPA) was the predominant BP in both water and sediment samples with levels ranging from 5.26 to 12.04 ng/L in water and 0.56 to 5.22 ng/g dw in sediment samples, followed by bisphenol AF (BPAF: 0.44-0.60 ng/L in water and 0.08-0.66 ng/g dw in sediment samples, respectively) and bisphenol S (BPS: 0.07-0.63 ng/L in water and not detected (ND) to 0.19 ng/g dw in sediment samples, respectively). There is no signif-icant spatial difference of BPs levels between riverine sediment samples and coastal sediment samples. Compared with other studies, the concentrations of BPs from the Beibu Gulf were relatively low. The mean log-transformed sediment -seawater partitioning coefficients (log Koc) ranged from 4.4 (DHBP) to 5.2 (BPAF) and the log Koc values for all the tar-get BPs were generally higher than those reported in freshwater environments. The present study firstly reported the field-based log Koc values for BPB (mean: 4.5) and DHBP (mean: 4.4). The estimated risk quotient (RQ) and 17 beta-estradiol (E2) equivalent quotient (EEQ) values indicated that the ecological and human health impacts were negligi-ble associated with target BPs. The present study provided reliable and detailed data for completely evaluating con-tamination level and environmental behaviors of BPs in the Beibu Gulf.