Water chlorination chemistry: nonmetal redox kinetics of chloramine and nitrite ion.

The first step in NH 2 Cl oxidation of NO 2 - is the general acid-assisted formation of nitryl chloride, where k HA is 7.6×10 6 M -2 s -1 for HaO + and is 46 M -2 s -1 for H 2 PO 4 - (25.0 o C, μ=0.50 M). This is the rate-limiting step at very low [NH 3 ] and high [NO 2 - ] concentrations: HA+NH 2 Cl+ NO 2 - →A - +NH 3 +NO 2 Cl, where the subsequent reactions of NO 2 Cl are rapid