Identification and quantification of the "Al13" tridecameric aluminum polycation using ferron

Evaluation of Al30 polynuclear species in polyaluminum solutions as coagulant for water treatment

“…Based on the difference of the dissociation and complex reaction kinetic rate between Ferron and hydrolyzed Al species, Al species in coagulants were divided into three types: monomeric species (Al a ) (reacting with Ferron within 1 min), planar oligomeric and medium polymeric species (Al b ) (reacting with Ferron from one to 120 min), and three-dimensional species or sol-gels (Al c ) (reacting with Ferron after 120 min and non-reacting with Ferron). Al c was obtained by Al T minus Al a and Al b (Parker and Bertsch, 1992). In 27 Al NMR analysis, the aluminum at 0 ppm was assigned to Al monomer (Al m ).…”

Analysis of engineered nanomaterials in complex matrices (environment and biota): General considerations and conceptual case studies

“…X-ray photoelectron spectroscopy and related techniques are attractive in the sense that they provide element-specific information while probing the surface of nanoparticles or their aggregates. Nuclear magnetic resonance tools also provide detailed speciation data [10]. However, they cannot be applied to all elements, and the presence of paramagnetic elements in the matrix (such as iron [III] in a soil sample) renders the analysis impossible.…”

Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation

“…Total Al concentrations were measured by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) (OPTIMA 2000DV, PerkinElmer, USA). The Al species were analyzed by the ferron colorimetric method [23]. Al a , Al b , and Al c corresponded to monomeric, medium polymer, and large polymer species and/or solid-phase Al(OH) 3 , respectively.…”