The adsorption of three estrogenic compounds (bisphenol A (BPA), 17-estradiol
(E2), and 17+/--ethynyl estradiol (EE2)) on powdered activated carbons (PACs) 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 were 201 ng/L, 313 ng/L, and
283 ng/L for BPA, E2, and EE2, respectively. In addition, the adsorption of E2 was
measured by liquid scintillation counting using tritium (3H) labeled E2 in the ng/L range.
The order of compound removal by PAC (E2>EE2>BPA) corresponded with logKow
values for the compounds (4.0, 3.7, 3.3, respectively). Kinetic and PAC dose-response
experiments were conducted with the two 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. In addition, the removal percentage of E2 occurring at ng/L
levels by PAC was independent of their initial concentration. Includes 20 references, tables, figure.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 260 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 9 |
| Published : | 06/15/2003 |
