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• 98-50-0 p-aminophenylarsonic acid 
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• 7732-18-5 water 
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• 866999-37-3 diiodomethyl-arsonic acid 
• 861597-37-7 bis-diiodomethyl-arsinic acid 
• 15606-95-8 triethyl arsenate 
• 124-58-3 methylarsonic Acid 
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• 2896-10-8 tritolylarsine 

Relevant academic research and scientific papers

Relaxation behavior in a bistable chemical system. Plateau behavior

The relaxation behavior of the bistable iodate-arsenous acid reaction near a hysteresis limit has been investigated.Outside the bistability region, relaxations to the unique stable steady state may exhibit a plateau in concentration as a function of time, corresponding to a local minimum in rate of reaction.Very close to the saddle-node bifurcation defining the bistability limit, the relaxing system remains in the plateau for long periods of time.Experimental measurements of plateau behavior are compared to behavior predicted by a one-variable model of the iodate- arsenous acid system.

Rapid catalytic oxidation of As(iii) to As(v) using a: Bacillus spore-2,2,6,6-tetramethylpiperidine-1-oxyl system

The oxidation of As(iii) to As(v) is a critical process in the treatment of contaminated water. We found that 95% As(iii) (10 mg L-1) could be rapidly oxidized to As(v) by a laccase-2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) system in 1 h. Based on this finding, we used Bacillus subtilis spores instead of laccase for As(iii) oxidation with the same effect because the former had plenty of CotA-laccase on their surface. The catalytic ability of CotA protein and spores was confirmed by expressing the CotA protein and knocking out the cotA gene from wild-type spores. Both laccase- and spore-TEMPO systems displayed similar oxidation rate constants, Michaelis-Menten constants, and maximal velocities owing to the formation of the oxoammonium cation of TEMPO in the presence of dissolved oxygen. Several other laccase mediators such as 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic-acid) (ABTS), acetosyringone (AS), 1-hydroxybenzotriazole (HBT), 2-hydroxybutyl acrylate (HBA), violuric acid (VLA), 4-oxo-TEMPO, 4-amino-TEMPO, 4-methoxy-TEMPO, 4-hydroxy-TEMPO benzoate, and 4-hydroxy-TEMPO coupled with spores for As(iii) oxidation were also investigated in detail. The spore-TEMPO system exhibited the highest oxidation efficiency and tolerated the addition of 10 mg L-1 Al3+, Ti4+, Cu2+, K+, Fe3+, Zn2+, Ni2+, Mg2+, Co2+, and Mn2+. Both laccase and spores recovered via ultrafiltration and centrifugation, respectively, could be reused for at least five cycles. The developed spore-based system has several advantages including eco-friendliness, ease of operation and storage, low cost, recyclability, sustainability, and without the need for enzyme purification. These findings may have promising implications for developing a new eco-friendly and cost-effective technology for the treatment of arsenic-containing water.

Chemical Waves in the Acidic Iodate Oxidation of Arsenite

After a brief induction period, an unstirred, initially homogeneous solution containing arsenite and iodate at pH ca. 2 may give rise to a single wave af chemical reactivity.The waves have been studied in thin layers and in narrow tubes of solution.The wave is apparently initiated at a region of high I2 concentration, where autocatalytic production of I- begins and spreads into the rest of the solution by diffusion.Waves were also electrochemically initiated in thin layers of solution at a negatively biased Pt electrode.A simple rection-diffusion model is given to illustrate wave propagation in such a system.

Iron arsenate frameworks

Six new iron arsenate framework structures, Fe2As 2O7·2H2O, [Fe6As 8O32H4]2-(1,4-butanediamininium 2+)·2H2O, [Fe4As6/

Bistability in the Oxidation of Arsenite by Iodate in a Stirred Flow Reactor

The reaction between arsenite and iodate at 25 deg C and pH 2.25 in a stirred tank reactor exhibits bistability over a range of flow rates and input arsenite and iodate concentrations.Observed steady-state I- and I2 concentrations and points of transition between bistable and unistable behavior are in excellent agreement with values calculated from a simple model consisting of three overal component processes: (A) IO3- + 3H3AsO3 = I- + 3H3AsO4; (B) IO3- + 5I- + 6H+ = 3I2 + 3H2O; (C) I2 + H3AsO3 + H2O = 2I- + H3AsO4 + 2H+.Implications for the recently discovered arsenite-iodate-chlorite-oscillating reaction are discussed.

Electrochemical synthesis of arsenic acid

The possibility of oxidizing arsenic(III) oxide to arsenic acid in quantitative yield in the presence of hydrochloric or hydrobromic acid as a catalyst was studied.

Compatible Mechanism for a Simultaneous Description of the Roebuck, Dushman, and Iodate-Arsenous Acid Reactions in an Acidic Medium

The iodine-arsenous acid (Roebuck), iodide-iodate (Dushman), and iodate-arsenous acid reactions have been studied simultaneously by a stopped-flow technique by monitoring the absorbance-time profiles at the isosbestic point of the I2/I3- system (468 nm). Using the well-accepted rate coefficients of iodine hydrolysis, we have proven that iodine is the kinetically active species of the iodine-arsenous acid reaction. Strong iodide inhibition of this system is explained by a rapidly established equilibrium between iodine and arsenous acid to produce an iodide ion, a hydrogen ion, and a short-lived intermediate H2AsO3I, which is shifted far to the left. Taking into consideration the generally accepted kinetic model of the Dushman reaction where I2O2 plays a key role to account for all of the most important observations in this subsystem and a sequence of simple formal oxygen-transfer reactions between arsenous acid and iodic acid as well as iodous acid and hypoiodous acid, we propose a 13-step comprehensive kinetic model, including seven rapidly established equilibria with only six fitted parameters, that is able to explain all of the most important characteristics of the kinetic curves of all of the title systems both individually and simultaneously.

Synthesis, structure, and thermal expansion of sodium zirconium arsenate phosphates

Sodium zirconium arsenate phosphates NaZr2(AsO4) x (PO4)3-x were synthesized by precipitation technique and studied by X-ray diffraction and IR spectroscopy. In the series of NaZr2(AsO4) x (PO4)3-x, continuous substitution solid solutions are formed (0 ≤ x ≤ 3) with the mineral kosnarite structure. The crystal structure of NaZr2(AsO 4)1.5(PO4)1.5 was refined by full-profile analysis: space group R c, a = 8.9600(4)?, c = 22.9770(9) ?, V = 1597.5(1) ?3, R wp = 4.55. The thermal expansion of the arsenate-phosphate NaZr2(AsO4) 1.5(PO4)1.5 and the arsenate NaZr 2(AsO4)3 was studied by thermal X-ray diffraction in the temperature range of 20-800°C. The average linear thermal expansion coefficients (αav = 2.45 × 10-6 and 3.91 × 10-6 K-1, respectively) indicate that these salts are medium expansion compounds.

Critical Slowing Down in the Bistable Iodate - Arsenic(III) Reaction

Relaxation kinetics in the bistable iodate oxidation of arsenic(III) have been investigated.Evidence for critical slowing down has been found as the bistability hysteresis limits are approached.The relaxation behavior is accounted for with a simple two variable model.

Relaxation behavior in a bistable chemical system near the unstable steady state and separatrix

n investigation of relaxation behavior in the bistable iodate-arsenous acid reaction is presented.Relaxations from the unstable steady state and separatrix to a stable steady state are compared to model predictions.Relaxations from the unstable steady state are analyzed with a linearized model and relaxations from near the separatrix are explained in terms of a computed phase portrait.