[Distribution Characteristics and Pollution Status of Phthalate Esters in the Groundwater of Hutuo River Pluvial Fan].

A total of 51 groundwater samples were collected from Hutuo River Pluvial Fan in September, 2014, and 6 phthalate esters (PAEs) were analyzed by gas chromatography-mass spectrometry. The distribution characteristics and health risk assessment were investigated in the present study. The results showed that the PAEs could not be detected in only one sample site. The concentration of the six total PAEs ranged between not detectable and 28873.1 ng·L, and the PAEs pollution level of the this research area was higher than other regions reported in China. There was obvious difference in the characteristics of space distribution of PAEs constitutes among the three groundwater units. The concentration of PAEs was sequenced from large to small as follows: Gangnan reservoir valley fracture pore water unit (G1)> the pore water unit of the top of Hutuo River Pluvial fan (G2)> the shallow pore water unit of the middle part of Hutuo River Pluvial fan (G3). The results showed that the DMP was dominant in 23 sample sites among all the 39 samples within the G2 and G3 groundwater units, while the concentration of PAEs was relatively higher in the other sample points and the DEHP, DBP were the predominant components, which should be attributed to the industrial point pollution or the pollution originated from surface runoff around the sample sites. The health risk of drinking groundwater polluted by PAEs in the study area was evaluated by the recommended method by US EPA. The non-cancer risk index and the cancer risk index was lower than 1.1×10 and 1.2×10, respectively, which was both lower than the risk level recommended by US EPA.