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Time dependence of CH4 concentrations determined
from
the headspace of a N2-saturated sample containing 10 μM
PHQ, 10 mM ascorbate, 2 mM H2O2,100 μM
DETAPAC, and 100 μM neocuproine in 1:3 DMSO/phosphate buffer
(20 mM, pH 7.4) (v/v).