http://netedu.xauat.edu.cn/jpkc/netedu/jpkc2009/szylyybh/content/wlzy/1/Review%20of%20Arsenic%20in%20natural%20water%20-%20Smedly.pdf

A review of the source, behaviour and distribution of arsenic in natural waters

Arsenic removal from water/wastewater using adsorbents—A critical review

Arsenic derived from natural sources occurs in groundwater in many countries, affecting the health of millions of people. The combined effects of As(V) reduction and diagenesis of iron oxide minerals on arsenic mobility are investigated in this study by comparing As(V) and As(III) sorption onto amorphous iron oxide (HFO), goethite, and magnetite at varying solution compositions. Experimental data are modeled with a diffuse double layer surface complexation model, and the extracted model parameters are used to examine the consistency of our results with those previously reported. Sorption of As(V) onto HFO and goethite is more favorable than that of As(III) below pH 5−6, whereas, above pH 7−8, As(III) has a higher affinity for the solids. The pH at which As(V) and As(III) are equally sorbed depends on the solid-to-solution ratio and type and specific surface area of the minerals and is shifted to lower pH values in the presence of phosphate, which competes for sorption sites. The sorption data indicate tha...

Comparison of arsenic(V) and arsenic(III) sorption onto iron oxide minerals: implications for arsenic mobility.

https://pubag.nal.usda.gov/download/27113/PDF

Mechanisms of Arsenic Adsorption on Amorphous Oxides Evaluated Using Macroscopic Measurements, Vibrational Spectroscopy, and Surface Complexation Modeling.

Aquatic arsenic: Toxicity, speciation, transformations, and remediation

Because of its toxicity, arsenic is of considerable environmental concern. Its solubility in natural systems is strongly influenced by adsorption at iron oxide surfaces. The objective of this study was to compare the adsorption behavior of arsenite and arsenate on ferrihydrite, under carefully controlled conditions, with regard to adsorption kinetics, adsorption isotherms, and the influence of pH on adsorption. The adsorption reactions were relatively fast, with the reactions almost completed within the first few hours. At relatively high As concentrations, arsenite reacted faster than arsenate with the ferrihydrite, i.e., equilibrium was achieved sooner, but arsenate adsorption was faster at low As concentrations and low pH. Adsorp tion maxima of approximately 0.60 (0.58) and 0.25 (0.16) molAs molFe-1 were achieved for arsenite and arsenate, respectively, at pH 4.6 (pH 9.2 in parentheses). The high arsenite retention, which precludes its retention entirely as surface adsorbed species, indicates the likel...

Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes

Introduction Von Willebrand disease (VWD) is a common congenital haemorrhagic disorder affecting around 1 in every 100 individuals. Prophylactic von Willebrand factor (VWF) replacement therapy in patients with severe VWD, including paediatric patients, is associated with reduced mucosal and joint bleeding rates, decreased median annual bleeding rate (ABR), a reduced incidence of major bleeding events (BEs) and good tolerability. WIL-33 will investigate the efficacy, pharmacokinetics (PK) and safety of a plasma-derived, stable, highly purified, double virus inactivated VWF/factor VIII (FVIII) concentrate (Octapharma) in paediatric patients with severe VWD. 

Phase 3 study of the efficacy, pharmacokinetics, immunogenicity and safety of von Willebrand Factor/Factor VIII concentrate in patients with severe von Willebrand Disease under 6 years of age

and Amita Jain

Papers

Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes

Phase 3 study of the efficacy, pharmacokinetics, immunogenicity and safety of von Willebrand Factor/Factor VIII concentrate in patients with severe von Willebrand Disease under 6 years of age