Research Of Typical Endocrine Disrupting Distribution On The Natural Water Particals

Endocrine disrupting compounds(EDCs)as a new type of persistent trace organic pollutants,and has been widespread concerned because the organism of the nervous system,reproductive system and other serious impact by minimal exposure concentration.With the increasing concentration of EDCs in the environment,the migration and transformation of natural water environment has become a hotspot.Particulate matter,especially colloidal particles,is an important factor in determining the migration and transformation of pollutants.Based on the detection rate and concentration range of EDCs in Hun River and Xi River,the two typical endocrine disruptors bisphenol A(Bisphenol A)and 17?-estradiol(E2,17?-estradiol)were selected as the target contamination.The partition coefficient(Kd)and organic carbon normalization coefficient(Koc)of the pollutants in the sediments and water phases were calculated,which were based on the measured values of BPA and E2 in the measured water bodies and sediments.That was to compare the distribution behavior of BPA and E2 under the condition of the natural environment and the batch test,and the effect of sediment organic matter on the adsorption of target pollutants was studied.Then,the commercial HA was used as model colloid to further study the effect of organic matter and its physic-chemical properties on the distribution of BPA and E2.The average organic carbon normalized partition coefficient values(LogKcoc)was calculated for understanding effect of rganic carbon in colloidal.And the influence of nano-oxide colloid and HA colloid on the distribution of BPA and E2 was also investigated.The main conclusions are as follows:(1)LogKd and LogKoc in the two phases were obtained based on the field detection of BPA and E2 concentrations in Hun River and Xi River water and sediments.The ranges of LogKd and LogKoc of BPA were 1.63 ~ 2.84 and 2.66 ~ 4.66,respectively.The LogKd and LogKoc of E2 were 4.78 and 5.42,respectively.LogKd of BPA increases with the increase of organic matter content in sediments,and organic matter plays a key role in the distribution of BPA sediments and water phases.(2)Under the test conditions,LogKd and LogKoc of BPA were 1.40 and 3.51,respectively,and LogKd and LogKoc of E2 were 1.10 and 3.21 respectively.Organic matter affects the distribution behavior of BPA in the two phases,but the effect of organic matter on the distribution behavior of E2 in the two phases was not significant.The diference of LogKd and LogKoc are the result of a combination of multiple factors.Even if the LogKd and LogKoc of BPA were comparable to LogKd and LogKoc obtained in the natural environment under batch test conditions,LogKd and LogKoc in the natural environment could not be replaced to a certain extent value.(3)Under the experimental conditions,the distribution of BPA and E2 did not increase with the concentration of commercial HA colloid.On the contrary,LogKcoc decreased with the increase of colloidal organic carbon,indicating that the colloidal organic carbon content was not the main factors for affecting the distribution of target pollutants in the colloidal phase.Change the p H value and Ca2 + concentration in the solution,and the amount of BPA and E2 in the colloid phase also changes.(4)The distribution of BPA and E2 on the mixed colloid(HA colloid + nano-Fe2O3 / nano-MnO2)was greater than that on the single colloid.The interaction between the inorganic colloid and the organic colloid has an important effect on the migration and transformation of BPA and E2 on natural water.