TABLE 3.

Mass balance S reactions for the two treatments and potential S abiotic and biotic reactions important for stoichiometric balancing.

Formula	Eq. #	References
$6{\mathrm{S}}^0\to 2\mathrm{S}{\mathrm{O}}_4^{2-}+4{\mathrm{S}}^{\text{Other}\cdot \text{SOI}}+5{\mathrm{H}}^{+}$	1	This paper, S0 treatment days 0–5
${\text{S}}^0+{\mathrm{O}}_2+{\mathrm{H}}_2\text{O}\to {\mathrm{SO}}_3^{2-}+2{\mathrm{H}}^{+}$	2	Based on Suzuki (1999)
${\text{SO}}_3^{2-}+0.5{\mathrm{O}}_2\to {\text{SO}}_4^{2-}$	3	Based on Suzuki (1999)
${\text{S}}^0+{\mathrm{SO}}_3^{2-}\leftrightarrow {\text{S}}_2{\text{O}}_3^{2-}$	4	Based on Johnston and McAmish (1973) and Suzuki (1999)
$2{\mathrm{S}}_2{\text{O}}_3^{2-}+0.5{\mathrm{O}}_2+2{\mathrm{H}}^{+}\to {\text{S}}_4{\text{O}}_6^{2-}+{\mathrm{H}}_2\text{O}$	5	Based on Suzuki (1999)
${\text{S}}_4{\text{O}}_6^{2-}+3.5{\mathrm{O}}_2+3{\mathrm{H}}_2\text{O}\to 4\mathrm{S}{\mathrm{O}}_4^{2-}+6{\mathrm{H}}^{+}$	6	Based on Suzuki (1999)
$37{\mathrm{S}}_2{\text{O}}_3^{2-}+0.5{\mathrm{SO}}_3^{2-}\to 7{\mathrm{S}}^0+31.5{\mathrm{SO}}_4^{2-}$	7	This paper, ${\text{S}}_2{\text{O}}_3^{2-}$ treatment days 0–2
+ 36SOther⋅SOI + 20H+
$3{\mathrm{S}}_2{\text{O}}_3^{2-}\to 2{\mathrm{S}}^0+2\mathrm{S}{\mathrm{O}}_4^{2-}+2{\mathrm{S}}^{\text{Other}\cdot \text{SOI}}+{\mathrm{H}}^{+}$	8	This paper, ${\text{S}}_2{\text{O}}_3^{2-}$ treatment days 0–4
${\text{SO}}_3^{2-}+{\mathrm{H}}_2\text{O}\to {\text{SO}}_4^{2-}+2{\mathrm{H}}^{+}$	9	Based on Suzuki (1999)
${\text{S}}_4{\text{O}}_6^{2-}+{\mathrm{H}}_2\text{O}\to {\text{S}}_3{\text{O}}_3^{2-}+{\mathrm{SO}}_4^{2-}+2{\mathrm{H}}^{+}$	10	Based on Pronk et al. (1990) and Suzuki (1999)
$4{\text{S}}_3{\text{O}}_3^{2-}\to 8{\mathrm{S}}^0+4\mathrm{S}{\mathrm{O}}_3^{2-}$	11	Based on Steudel et al. (1987) and Pronk et al. (1990)