4.2.The oxygen transport Gas phase Liquid film Bulk liquid C=C米 0<C<C￥ C=0 一6 Distance Oxygen concentration gradients at the gas-liquid interface.Cg is the oxygen concentration in the gas phase(about 300 mg/L).At the liquid side of the interface(=0)the dissolved oxygen concentration C*is given by Henry's law.It is about 7 mg/L in water in equilibrium with air.Depending on the oxygen consumption rate in the liquid different concentration gradients(a-d)will appear through the liquid film with the thickness 4.2. The oxygen transport