Prestel Harald, Schott Lucie, Niessner Reinhard, Panne Ulrich
Institute of Hydrochemistry, Technical University of Munich, Marchioninistr. 17, 81377 Munich, Germany.
Water Res. 2005 Sep;39(15):3541-52. doi: 10.1016/j.watres.2005.06.027.
Asymmetrical flow field-flow fractionation (AF4) was applied to characterize aquatic colloids from biological sewage plants and to infer information of colloidal loads, sources, and sinks within the plants, resp. the colloidal interaction with the aqueous phase and the sewage sludge. To characterize the colloids further, especially the distributions of colloid associated heavy metals, the AF4 system was coupled to an inductively coupled plasma mass spectrometer (ICP-MS). The size distribution is determined by AF4 with UV absorbance and fluorescence detection after a calibration by monodisperse polystyrene sulfonate standards (PSS). Samples from different sewage plants and from different depths and locations within a plant were compared. The fulvic/humic acid fraction with a particle diameter d(p) < 10 nm appeared to be comparable in all samples and decreases only slightly along the plants, whereas larger colloids with d(p) > 10 nm almost completely passed into the sewage sludge. The concentrations of the initial colloidal heavy metals decreased along the plants.
采用不对称流场流分馏法（AF4）对生物污水处理厂的水生胶体进行表征，并推断该厂内胶体负荷、来源和汇的信息，以及胶体与水相和污水污泥的相互作用。为了进一步表征胶体，特别是与胶体相关的重金属的分布，将AF4系统与电感耦合等离子体质谱仪（ICP-MS）联用。通过单分散聚苯乙烯磺酸盐标准品（PSS）校准后，利用AF4结合紫外吸光度和荧光检测来确定粒径分布。比较了不同污水处理厂以及同一污水处理厂内不同深度和位置的样品。所有样品中粒径d(p) < 10 nm的富里酸/腐殖酸部分似乎相当，且沿处理厂流程仅略有下降，而粒径d(p) > 10 nm的较大胶体几乎完全进入污水污泥中。初始胶体重金属的浓度沿处理厂流程降低。
