Yoon Yeomin, Westerhoff Paul, Snyder Shane A, Esparza Mario
Department of Civil and Environmental Engineering, Arizona State University, ECG-252, Tempe, AZ 85287-5306, USA.
Water Res. 2003 Aug;37(14):3530-7. doi: 10.1016/S0043-1354(03)00239-2.
The adsorption of three estrogenic compounds (bisphenol A (BPA), 17beta-estradiol (E2), and 17alpha-ethynyl estradiol (EE2)) on several powdered activated carbons (PAC) was investigated. Without preconcentration, method detection limits (MDL) using high-performance liquid chromatography (HPLC) with fluorescence detection at an excitation wavelength of 280 nm and an emission wavelength of 310 nm were 0.88, 1.15, and 0.96 nM for BPA, E2, and EE2, respectively. Compound recoveries were >90% in raw drinking water matrices. PAC screening studies (six PAC brands) indicated all three compounds were removed by PAC, but the percentage removal ranged from 31% to >99% based upon PAC type/dosage and presence/absence of natural organic matter. The order of removal (E2>EE2>BPA) corresponded with logK(ow) values for the compounds (3.1-4.0, 3.7-3.9, 3.3, respectively). Kinetic and PAC dose-response experiments were conducted with the two best performing PACs. Increasing contact time and PAC dose improved compound removal. Freundlich isotherm parameters were fit to the experimental data. This study confirms that PAC treatment is feasible for >99% removal of three estrogenic compounds from raw drinking waters that may be at risk for containing such compounds, at least at initial concentration of 500 ng/l and higher.
研究了三种雌激素化合物（双酚A（BPA）、17β-雌二醇（E2）和17α-乙炔基雌二醇（EE2））在几种粉末活性炭（PAC）上的吸附情况。在不进行预浓缩的情况下，使用高效液相色谱（HPLC）并在激发波长为280 nm和发射波长为310 nm处进行荧光检测时，BPA、E2和EE2的方法检测限（MDL）分别为0.88、1.15和0.96 nM。在原饮用水基质中，化合物回收率>90%。PAC筛选研究（六个PAC品牌）表明，所有三种化合物都能被PAC去除，但根据PAC类型/剂量以及天然有机物的存在与否，去除百分比范围为31%至>99%。去除顺序（E2>EE2>BPA）与化合物的logK(ow)值相对应（分别为3.1 - 4.0、3.7 - 3.9、3.3）。对两种性能最佳的PAC进行了动力学和PAC剂量响应实验。增加接触时间和PAC剂量可提高化合物的去除率。将Freundlich等温线参数拟合到实验数据中。本研究证实，对于可能含有此类化合物的原饮用水，至少在初始浓度为500 ng/l及更高时，PAC处理对于去除三种雌激素化合物>99%是可行的。
