caa a22 4500 465762026 CHVBK 20180323111902.0 cr unu---uuuuu 170327e19900301xx s 000 0 eng 10.1007/BF00878240 doi (NATIONALLICENCE)springer-10.1007/BF00878240 Chemical aspects of iron oxide coagulation in water: Laboratory studies and implications for natural systems [Elektronische Daten] Dedicated to Werner Stumm for his 65th birthday [Liyuan Liang, James Morgan] Initial coagulation rates of colloidal hematite (α-Fe2O3) particles (diameter less than 0.1 µm) were measured experimentally in well-defined laboratory systems at constant temperature. The relative stability ratio,W, was obtained at various ionic strengths in NaCl medium and at pH values in the range from 3 to 12. ExperimentalW values ranged from 1 to 104 in various systems. The results delineate the roles ofspecific andgeneralized coagulation mechanisms for iron oxides. Among the specifically-interacting species (ΔG ads 0 >ΔG coul 0 ) studied were phosphate, monomeric organic acids of various structures, and polymeric organic acids. The critical coagulation-restabilization concentrations of specifically-interacting anions (from 10−7 to 10−4 molar) can be compared with the general effects of non-specific electrolyte coagulants (10−3 to 10−1 molar). The laboratory results are interpreted with the help of a Surface Complex Formation/Diffuse Layer Model (SCF/DLM) which describes variations of interfacial charge and potential resulting from variations of coagulating species in solution. Comparison of these laboratory experiments with observations on iron behavior in estuarine and lake waters aids in understanding iron removal mechanisms and coagulation time scales in natural systems. Birkhäuser Verlag, 1990 Coagulation nationallicence colloidal stability nationallicence hematite nationallicence surface complex formation nationallicence Liang Liyuan W. M. Keck Laboratories, Environmental Engineering Science, California Institute of Technology, 91125, Pasadena, CA, USA aut Morgan James W. M. Keck Laboratories, Environmental Engineering Science, California Institute of Technology, 91125, Pasadena, CA, USA aut Aquatic Sciences Birkhäuser-Verlag 52/1(1990-03-01), 32-55 1015-1621 52:1<32 1990 52 27 https://doi.org/10.1007/BF00878240 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00878240 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liang Liyuan W. M. Keck Laboratories, Environmental Engineering Science, California Institute of Technology, 91125, Pasadena, CA, USA aut NATIONALLICENCE 700 1- Morgan James W. M. Keck Laboratories, Environmental Engineering Science, California Institute of Technology, 91125, Pasadena, CA, USA aut NATIONALLICENCE 773 0- Aquatic Sciences Birkhäuser-Verlag 52/1(1990-03-01), 32-55 1015-1621 52:1<32 1990 52 27 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer