Table 2.

Estimated lifetime of ozone upon reaction with manure components present in high concentration and with large reaction rate constants.

Compound	Rate constant 1 [M–1s–1]	pKa2	Concentration3 [mM]	τO34 [s]
H2S	3 × 104	7.00	0.02–0.91	0.4–1.6 × 10–1
HS−	3 × 109	7.00	0.1–2.2	0.2–3.4 × 10–6
NH3	2 × 101	9.25	0.7–5.3	0.9–6.9 × 101
4-methylphenol	3 × 104	10.2	1	3 × 10–2
4-methylphenolate	∼1 × 109	10.2	0.0005	2.3 × 10–4
Butanoate	<4 × 10–2	4.8	1.5–9.8	0.3–1.6 × 104

¹Source: [13,22]. For 4-methylphenolate, the value for phenolate has been used;

²pKa-values for corresponding acids are shown;

³Concentration [X] range based on measured sum of acid and base concentration, the pKa value and the measured pH (Table 1) in the six batches. The presented 4-methylphenol and 4-methylphenolate concentrations were the maximum in [21];

⁴Ozone's lifetime upon reaction with the compound is calculated with Equation (1).