Hydroxyl Arsenous(III) acid

Muller, J.C.; Ferradini, C.; Pucheault, J.
Int. J. Radiat. Phys. Chem. 7, 643-650 (1975)

Reaction: ·OH + HAsO₂ ® As(IV)
Solvent: H₂O

k = 1.8 × 10⁹(L mol^-1 s^-1), pH ~1

Experimental method: Pulse radiolysis
Analytical method: chemical analysis
Data type: Derived from fitting to complex mechanism

Obs G(As^V) and G(H₂O₂); assuming k(H + As^IV) = 7 × 10⁸; 0.4 mol L^-1 H₂SO₄. Unrecommended value because of deficiencies in the method.

Woods, R.; Kolthoff, I.M.; Meehan, E.J.
J. Am. Chem. Soc. 86, 1698-1700 (1964)

Reaction: ·OH + HAsO₂ ® As(IV)
Reference Reaction: ·OH + Fe²⁺ ®
Solvent: H₂O

pH range 1 to 3, k/k_reference = 4
k = 1 × 10⁹(L mol^-1 s^-1), k_reference = 4.3 × 10⁸(L mol^-1 s^-1), T = 298K

Experimental method: Fenton reaction
Analytical method: chemical analysis
Data type: Relative value measured by steady state method

Competition kinetics in soln. contg. 5 × 10^-5 mol L^-1 Fe²⁺, 2.5 × 10^-5 mol L^-1 H₂O₂, HClO₄, and added Fe³⁺ which oxidizes the As(IV) formed. Unrecommended value because of deficiencies in the method.