Ecological Risk Assessment of Phthalate Esters (DBP and DEHP) in Surface Water of China

As a new type of pollutant, phthalate esters (PAEs) are common organic compounds in industrial production and daily life, which are widely detected in surface water environment. Among them, dibutyl phthalate (DBP) and bis (2-ethylhexyl) phthalate (DEHP) have attracted much attention due to their harmful effects on aquatic life such as endocrine disrupting effects. In this study, the toxicity data of DBP and DEHP were collected and screened through literature research, and their water quality criteria (WQC) for protecting aquatic life were derived by the species sensitivity distribution method. In addition, the distributions of DBP and DEHP in surface water environment of China were analyzed and their ecological risk levels to aquatic life in six regions were evaluated by hazard quotients (HQs) and probabilistic approaches. The result revealed that the chronic WQC of DBP is 12.9 μg/L (criteria continuous concentration, CCC) and acute WQC is 162.9 μg/L (criteria maximum concentration, CMC) and the chronic WQC of DEHP is 1.0 μg/L (CCC) and acute WQC is 71.8 μg/L (CMC). The ecological risk of DBP and DEHP in North China and Yangtze River is relatively higher than other regions, which may have harmful effects on the aquatic environments. So, it is necessary to strengthen the water quality management. The results could provide scientific basis for ecological risk management of DBP and DEHP