Table 1. Second-order rate constants of H₂S with oxidants (Refs. 65,75).

Reaction with oxidants	Rate constants (M−1 s−1) at 37 °C
${\text{O}}_2^{-}$ + H2S/HS− → H2O2 + S−	1.5 × 106
HO. + H2S/HS− → S− + H2O	1.5 × 1010
H2O2 + HS− → HSOH + OH−	0.73
ONOOH + HS− → HSOH + N${\text{O}}_2^{-}$	4.8 × 103
HSOH + HS− → HSSH + OH−	1.0 × 105
HOCl + HS− → HSCl + OH−	8.0 × 107
S− + S− + 2H+ → HSSH	6.5 × 109