Occurrence and distribution of phthalate esters in freshwater aquaculture fish ponds in Pearl River Delta, China&z.star;

The concentrations, congener profiles and spatial distribution of 13 phthalate esters (PAEs) in the freshwater fish ponds in the Pearl River Delta (PRD) region were investigated in water and sediment samples collect from 22 sites during Jul. 2016-Sept. 2017. The di-2-ethylhexyl phthalate (DEHP) was the predominant compounds in both water and sediment samples, accounting for 70.1% and 66.1% of Sigma PAEs, respectively. The DEHP concentrations in the water samples collected from the sites of Zhongshan (35.7 mu g/L), Jingmen (17.3 mu/L) and Nanhai (14.2 mu g/L) were higher than that collected from other sampling sites (p < 0.05), and exceed the Chinese environmental quality standards for surface water (DEHP, 8.00 mu g/L). The concentrations of Sigma PAEs (mean and median were 11.8 mg/kg dw and 7.95 mg/kg dw) in sediment was higher than that in sediment of river and estuary in the PRO region (p < 0.05). The median concentrations of DEHP and di-n-butyl phthalate (DBP) exceeded recommend environmental risk limit (ERL) that posed a potential risk to the aquaculture fish pond environment in the PRD. (C) 2018 Elsevier Ltd. All rights reserved.