Decay constant for singlet oxygen in the solvent:

Ethylene glycol/Methanol (50:50)

Young, R.H.; Brewer, D.; Keller, R.A.
J. Am. Chem. Soc. 95(2): 375-9 (1973)

Decay rate is 1.2 x 105 s–1

Experimental method: pulsed laser photolysis, substrate disappearance
Sensitizer is MB or RB,
Substrate is DPBF, kD = 1.6 x 105 s–1 when [DPBF] = 1.9 x 10–5 mol L–1 and beta = 6.3 x 10–5 mol L–1.

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