where C0 is the initial concentration of MO. In order to get
reliable data for R0, the value of A was measured every 2 min
at the initial stage of the PCD reaction. And the value of dA/dt
was determined by the slope of the tangent line at experimental
data points located on the curve of A versus t, i.e. the initial rate
(R0) was calculated from the tangent linear period.