To study the kinetics of denitri®cation by nanoscale
iron power, the eect of nitrate concentrations on the
nitrate removal rate was observed. Four dierent initial
nitrate concentrations (50, 100, 200, 400 mg/l) were tried
and the changes in nitrate concentrations with reaction
time are given in Fig. 1(a). To avoid the eect of changes
of Fe0 concentration by corrosion on the kinetics during
the reaction, stoichiometric excess of Fe0 particles
compared with nitrate applied were added.