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. 2023 May 24;19:100183. doi: 10.1016/j.wroa.2023.100183

Table 1.

OH scavenging of nitrogen species post-RO (pH 5.5).

Species Concentration k•OH (M  1s  1) Contribution to
OH scavenging
Refs.
Free chlorine 3 mg/L as Cl2 2.0 × 109 HOCl,
8.8 × 109 OCl
71% 2006

Anastasio and Matthew, 2006
Monochloramine 2 mg/L as Cl2 1.0 × 109 23% Anastasio and Matthew, 2006
Dichloramine 1.5 mg/L as Cl2 6.2 × 108 6% Anastasio and Matthew, 2006
Nitrate 0.8 mg/L as N 4.0 × 105b < 1% Yin et al. 2020b
Nitrite Variablea 1.1 × 1010 Variablea Yin et al., 2020

M  1s−1 = per molar per second.

a

Nitrite is likely to be present only in some systems with UV-H2O2, since free chlorine quickly converts nitrite to nitrate.

b

This reaction rate coefficient is reported in a secondary source from an ambiguous primary source, but evidence suggests that the rate is negligible.