[Distribution of phthalate acid esters in waters and Potamogeton crispus L. from the mainstream of Haihe River].

Concentrations of phthalate acid esters(PAEs) in waters and aquatic plant, Potamogeton crispus L., were measured from March 29 to May 25, 2008 in the mainstream of Haihe River. The results showed that dibutyl phthalate (DBP) and di(2-ethylhexyl) phthalate (DEHP) were detected in all samples of waters and Potamogeton crispus L.. Concentrations of DBP and DEHP in water samples ranged from 0.35-40.68 microg/L (mean 7.32 microg/L) and 3.54-101.2 microg/L (mean 21.72 microg/L), respectively. Concentrations of DBP and DEHP in Potamogeton crispus L. ranged from 0.007-0.242 microg/g (0.078 microg/g) and 0.163-1.286 microg/g (0.457 microg/g), respectively. Concentrations of DBP and DEHP in Potamogeton crispus L. reached the highest value during Potamogeton crispus L. blooming period and were significantly related to concentrations of DBP and DEHP in waters. PCF values of DBP and DEHP by Potamogeton crispus L. were obviously above 1, and the PCFs value reached the maxima during the early growing period and the minima during the period of decay. Concentration and PCF of DBP were both lower than those of DEHP. Potamogeton crispus L. was an important sink of phthalate acid esters, a kind of hydrophobic organic compounds, because of its abundance in Haihe River.